data compression using a combination of content independent data compression and content dependent data compression. In one aspect, a system for compressing data comprises: a processor, and a plurality of data compression encoders wherein at least one data encoder utilizes asymmetric data compression. The processor is configured to determine one or more parameters, attributes, or values of the data within at least a portion of a data block containing either video or audio data, to select one or more data compression encoders from the plurality of data compression encoders based upon the determined one or more parameters, attributes, or values of the data and a throughput of a communications channel, and to perform data compression with the selected one or more data compression encoders on at least the portion of the data block.

Patent
   9236882
Priority
Dec 11 1998
Filed
Jun 01 2015
Issued
Jan 12 2016
Expiry
Dec 11 2018
Assg.orig
Entity
unknown
0
649
EXPIRED
1. A system for compressing data comprising:
a memory configured to store one or more data blocks;
a counter module configured to determine a size of the one or more data blocks;
a recognition module configured to analyze data within the one or more data blocks to identify one or more parameters or attributes of the data; and
a plurality of data compression encoders including one or more lossless, dictionary-type encoders and a different encoder;
wherein the one or more lossless, dictionary-type encoders are configured to compress the one or more data blocks if the one or more parameters or attributes are recognized, and the different encoder is configured to compress the one or more data blocks if the one or more parameters or attributes are not recognized.
18. A system for compressing data comprising:
a memory configured to store one or more data blocks;
a processor;
a recognition module, implemented on the processor, that is configured to analyze data within the one or more data blocks to identify one or more parameters or attributes of the data wherein the one or more parameters or attributes of the data is identified if it is already resident in a dictionary-type encoder library; and
a plurality of data compression encoders including one or more lossless, dictionary-type encoders and a different encoder;
wherein the one or more lossless, dictionary-type encoders are configured to compress the one or more data blocks if the one or more parameters or attributes are recognized, and the different encoder is configured to compress the one or more data blocks if the one or more parameters or attributes are not recognized.
2. The system of claim 1, wherein the recognition module is configured to recognize repeated blocks of data.
3. The system of claim 1, wherein the one or more parameters or attributes directly or indirectly indicate whether the one or more data blocks are already resident in a dictionary-type encoder library.
4. The system of claim 1, wherein the counter module determines whether the size of the one or more data blocks is greater than a predetermined threshold.
5. The system of claim 4, wherein the one or more parameters or attributes directly or indirectly indicate whether the one or more data blocks, or a portion of the one or more data blocks, is already resident in a dictionary-type encoder library.
6. The system of claim 1, further comprising an algorithm look-up table module.
7. The system of claim 1, wherein the one or more data blocks are received from an external source.
8. The system of claim 1, wherein the different encoder is a Lempel-Ziv encoder.
9. The system of claim 1, wherein the different encoder is one of a Huffman encoder or an arithmetic encoder.
10. The system of claim 1, wherein the different encoder is configured to perform data compression using null-suppression or data-compaction techniques.
11. The system of claim 1, wherein one or more of the plurality of data compression encoders is configured to compress data in real-time or pseudo real-time.
12. The system of claim 1, wherein the lossless, dictionary-type encoder is configured to perform data compression by eliminating repeated blocks of data or portions of repeated blocks of data.
13. The system of claim 1, wherein the lossless, dictionary-type encoder performs data compression by eliminating an output or transmission of at least one redundant string of data.
14. The system of claim 1, wherein the one or more recognized parameters or attributes of the data is one of a data structure, a data block format, or a data file substructure.
15. The system of claim 1, wherein the recognition module is configured to perform a probabilistic recognition.
16. The system of claim 1, wherein the recognition module is configured to perform a deterministic recognition.
17. The system of claim 1, wherein the recognition module excludes identification based solely on a descriptor that is indicative of the one or more parameters or attributes of the data within the one or more data blocks.
19. The system of claim 18, wherein the one or more data blocks is received by the one or more lossless, dictionary-type encoders in an uncompressed form, the one or more data blocks being included in a plurality of data blocks transmitted in sequence originating from an external source.
20. The system of claim 18, wherein the one or more data blocks is received by the one or more lossless, dictionary-type encoders in an uncompressed form, the one or more data blocks being included in a plurality of data blocks in sequence originating from an internal source.
21. The system of claim 18, wherein the different encoder is a Lempel-Ziv encoder.
22. The system of claim 18, wherein the different encoder is one of a Huffman encoder or an arithmetic encoder.
23. The system of claim 18, wherein the different encoder performs data compression using null-suppression or data-compaction techniques.
24. The system of claim 19, wherein one or more of the plurality of data compression encoders is configured to compress data in real-time or pseudo real-time.
25. The system of claim 20, wherein one or more of the plurality of data compression encoders is configured to compress data in real-time or pseudo real-time.
26. The system of claim 18, wherein the one or more recognized parameters or attributes is one of a data structure, a data block format, or a data file substructure.
27. The system of claim 18, wherein the recognition module is configured to perform a probabilistic recognition.
28. The system of claim 18, wherein the recognition module is configured to perform a deterministic recognition.
29. The system of claim 18, wherein two or more of the data compression encoders operate in parallel.
30. The system of claim 18, wherein the recognition module excludes identification based solely on a descriptor that is indicative of the one or more parameters or attributes.

This application is a Continuation of U.S. patent application Ser. No. 14/495,574, filed Sep. 24, 2014, which is a Continuation of U.S. patent application Ser. No. 14/251,453, filed Apr. 11, 2014, now U.S. Pat. No. 8,933,825, which is a Continuation of U.S. patent application Ser. No. 14/035,561, filed Sep. 24, 2013, now U.S. Pat. No. 8,717,203, which is a Continuation of U.S. patent application Ser. No. 13/154,211, now U.S. Pat. No. 8,643,513, filed Jun. 6, 2011, which is a Continuation of U.S. patent application Ser. No. 12/703,042, filed Feb. 9, 2010, now U.S. Pat. No. 8,502,707, which is a Continuation of both U.S. patent application Ser. No. 11/651,366, filed Jan. 8, 2007, now abandoned, and U.S. patent application Ser. No. 11/651,365, filed Jan. 8, 2007, now U.S. Pat. No. 7,714,747. Each of application Ser. No. 11/651,366 and application Ser. No. 11/651,365 is a Continuation of U.S. patent application Ser. No. 10/668,768, filed Sep. 22, 2003, now U.S. Pat. No. 7,161,506, which is a Continuation of U.S. patent application Ser. No. 10/016,355, filed Oct. 29, 2001, now U.S. Pat. No. 6,624,761, which is a Continuation-In-Part of U.S. patent application Ser. No. 09/705,446, filed Nov. 3, 2000, now U.S. Pat. No. 6,309,424, which is a Continuation of U.S. patent application Ser. No. 09/210,491, filed Dec. 11, 1998, which is now U.S. Pat. No. 6,195,024. Each of the listed applications are incorporated herein by reference in their entireties.

1. Technical Field

The present invention relates generally to a data compression and decompression and, more particularly, to systems and methods for data compression using content independent and content dependent data compression and decompression.

2. Description of Related Art

Information may be represented in a variety of manners. Discrete information such as text and numbers are easily represented in digital data. This type of data representation is known as symbolic digital data. Symbolic digital data is thus an absolute representation of data such as a letter, figure, character, mark, machine code, or drawing.

Continuous information such as speech, music, audio, images and video, frequently exists in the natural world as analog information. As is well known to those skilled in the art, recent advances in very large scale integration (VLSI) digital computer technology have enabled both discrete and analog information to be represented with digital data. Continuous information represented as digital data is often referred to as diffuse data. Diffuse digital data is thus a representation of data that is of low information density and is typically not easily recognizable to humans in its native form.

There are many advantages associated with digital data representation. For instance, digital data is more readily processed, stored, and transmitted due to its inherently high noise immunity. In addition, the inclusion of redundancy in digital data representation enables error detection and/or correction. Error detection and/or correction capabilities are dependent upon the amount and type of data redundancy, available error detection and correction processing, and extent of data corruption.

One outcome of digital data representation is the continuing need for increased capacity in data processing, storage, and transmittal. This is especially true for diffuse data where increases in fidelity and resolution create exponentially greater quantities of data. Data compression is widely used to reduce the amount of data required to process, transmit, or store a given quantity of information. In general, there are two types of data compression techniques that may be utilized either separately or jointly to encode/decode data: lossless and lossy data compression.

Lossy data compression techniques provide for an inexact representation of the original uncompressed data such that the decoded (or reconstructed) data differs from the original unencoded/uncompressed data. Lossy data compression is also known as irreversible or noisy compression. Entropy is defined as the quantity of information in a given set of data. Thus, one obvious advantage of lossy data compression is that the compression ratios can be larger than the entropy limit, all at the expense of information content. Many lossy data compression techniques seek to exploit various traits within the human senses to eliminate otherwise imperceptible data. For example, lossy data compression of visual imagery might seek to delete information content in excess of the display resolution or contrast ratio.

On the other hand, lossless data compression techniques provide an exact representation of the original uncompressed data. Simply stated, the decoded (or reconstructed) data is identical to the original unencoded/uncompressed data. Lossless data compression is also known as reversible or noiseless compression. Thus, lossless data compression has, as its current limit, a minimum representation defined by the entropy of a given data set.

There are various problems associated with the use of lossless compression techniques. One fundamental problem encountered with most lossless data compression techniques are their content sensitive behavior. This is often referred to as data dependency. Data dependency implies that the compression ratio achieved is highly contingent upon the content of the data being compressed. For example, database files often have large unused fields and high data redundancies, offering the opportunity to losslessly compress data at ratios of 5 to 1 or more. In contrast, concise software programs have little to no data redundancy and, typically, will not losslessly compress better than 2 to 1.

Another problem with lossless compression is that there are significant variations in the compression ratio obtained when using a single lossless data compression technique for data streams having different data content and data size. This process is known as natural variation.

A further problem is that negative compression may occur when certain data compression techniques act upon many types of highly compressed data. Highly compressed data appears random and many data compression techniques will substantially expand, not compress this type of data.

For a given application, there are many factors that govern the applicability of various data compression techniques. These factors include compression ratio, encoding and decoding processing requirements, encoding and decoding time delays, compatibility with existing standards, and implementation complexity and cost, along with the is adaptability and robustness to variations in input data. A direct relationship exists in the current art between compression ratio and the amount and complexity of processing required. One of the limiting factors in most existing prior art lossless data compression techniques is the rate at which the encoding and decoding processes are performed. Hardware and software implementation tradeoffs are often dictated by encoder and decoder complexity along with cost.

Another problem associated with lossless compression methods is determining the optimal compression technique for a given set of input data and intended application. To combat this problem, there are many conventional content dependent techniques that may be utilized. For instance, file type descriptors are typically appended to file names to describe the application programs that normally act upon the data contained within the file. In this manner data types, data structures, and formats within a given file may be ascertained. Fundamental limitations with this content dependent technique include:

(1) the extremely large number of application programs, some of which do not possess published or documented file formats, data structures, or data type descriptors;

(2) the ability for any data compression supplier or consortium to acquire, store, and access the vast amounts of data required to identify known file descriptors and associated data types, data structures, and formats; and

(3) the rate at which new application programs are developed and the need to update file format data descriptions accordingly.

An alternative technique that approaches the problem of selecting an appropriate lossless data compression technique is disclosed, for example, in U.S. Pat. No. 5,467,087 to Chu entitled “High Speed Lossless Data Compression System” (“Chu”). FIG. 1 illustrates an embodiment of this data compression and decompression technique. Data compression 1 comprises two phases, a data pre-compression phase 2 and a data compression phase 3. Data decompression 4 of a compressed input data stream is also comprised of two phases, a data type retrieval phase 5 and a data decompression phase 6. During the data compression process 1, the data pre-compressor 2 accepts an uncompressed data stream, identifies the data type of the input stream, and generates a data type identification signal. The data compressor 3 selects a data compression method from a preselected set of methods to compress the input data stream, with the intention of producing the best available compression ratio for that particular data type.

There are several limitations associated with the Chu method. One such limitation is the need to unambiguously identify various data types. While these might include such common data types as ASCII, binary, or unicode, there, in fact, exists a broad universe of data types that fall outside the three most common data types. Examples of these alternate data types include: signed and unsigned integers of various lengths, differing types and precision of floating point numbers, pointers, other forms of character text, and a multitude of user defined data types. Additionally, data types may be interspersed or partially compressed, making data type recognition difficult and/or impractical. Another limitation is that given a known data type, or mix of data types within a specific set or subset of input data, it may be difficult and/or impractical to predict which data encoding technique yields the highest compression ratio.

Accordingly, there is a need for a data compression system and method that would address limitations in conventional data compression techniques as described above.

The present invention is directed to systems and methods for providing fast and efficient data compression using a combination of content independent data compression and content dependent data compression. In one aspect of the invention, a method for compressing data comprises the steps of:

analyzing a data block of an input data stream to identify a data type of the data block, the input data stream comprising a plurality of disparate data types;

performing content dependent data compression on the data block, if the data type of the data block is identified;

performing content independent data compression on the data block, if the data type of the data block is not identified.

In another aspect, the step of performing content independent data compression comprises: encoding the data block with a plurality of encoders to provide a plurality of encoded data blocks; determining a compression ratio obtained for each of the encoders; comparing each of the determined compression ratios with a first compression threshold; selecting for output the input data block and appending a null compression descriptor to the input data block, if all of the encoder compression ratios do not meet the first compression threshold; and selecting for output the encoded data block having the highest compression ratio and appending a corresponding compression type descriptor to the selected encoded data block, if at least one of the compression ratios meet the first compression threshold.

In another aspect, the step of performing content dependent compression comprises the steps of: selecting one or more encoders associated with the identified data type and encoding the data block with the selected encoders to provide a plurality of encoded data blocks; determining a compression ratio obtained for each of the selected encoders; comparing each of the determined compression ratios with a second compression threshold; selecting for output the input data block and appending a null compression descriptor to the input data block, if all of the encoder compression do not meet the second compression threshold; and selecting for output the encoded data block having the highest compression ratio and appending a corresponding compression type descriptor to the selected encoded data block, if at least one of the compression ratios meet the second compression threshold.

In yet another aspect, the step of performing content independent data compression on the data block, if the data type of the data block is not identified, comprises the steps of: estimating a desirability of using of one or more encoder types based one characteristics of the data block; and compressing the data block using one or more desirable encoders.

In another aspect, the step of performing content dependent data compression on the data block, if the data type of the data block is identified, comprises the steps of: estimating a desirability of using of one or more encoder types based on characteristics of the data block; and compressing the data block using one or more desirable encoders.

In another aspect, the step of analyzing the data block comprises analyzing the data block to recognize one of a data type, data structure, data block format, file substructure, and/or file types. A further step comprises maintaining an association between encoder types and data types, data structures, data block formats, file substructure, and/or file types.

In yet another aspect of the invention, a method for compressing data comprises the steps of:

analyzing a data block of an input data stream to identify a data type of the data block, the input data stream comprising a plurality of disparate data types;

performing content dependent data compression on the data block, if the data type of the data block is identified;

determining a compression ratio of the compressed data block obtained using the content dependent compression and comparing the compression ratio with a first compression threshold; and

performing content independent data compression on the data block, if the data type of the data block is not identified or if the compression ratio of the compressed data block obtained using the content dependent compression does not meet the first compression threshold.

Advantageously, the present invention employs a plurality of encoders applying a plurality of compression techniques on an input data stream so as to achieve maximum compression in accordance with the real-time or pseudo real-time data rate constraint. Thus, the output bit rate is not fixed and the amount, if any, of permissible data quality degradation is user or data specified.

These and other aspects, features and advantages of the present invention will become apparent from the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings.

FIG. 1 is a block/flow diagram of a content dependent high-speed lossless data compression and decompression system/method according to the prior art;

FIG. 2 is a block diagram of a content independent data compression system according to one embodiment of the present invention;

FIGS. 3a and 3b comprise a flow diagram of a data compression method according to one aspect of the present invention, which illustrates the operation of the data compression system of FIG. 2;

FIG. 4 is a block diagram of a content independent data compression system according to another embodiment of the present invention having an enhanced metric for selecting an optimal encoding technique;

FIGS. 5a and 5b comprise a flow diagram of a data compression method according to another aspect of the present invention, which illustrates the operation of the data compression system of FIG. 4;

FIG. 6 is a block diagram of a content independent data compression system according to another embodiment of the present invention having an a priori specified timer that provides real-time or pseudo real-time of output data;

FIGS. 7a and 7b comprise a flow diagram of a data compression method according to another aspect of the present invention, which illustrates the operation of the data compression system of FIG. 6;

FIG. 8 is a block diagram of a content independent data compression system according to another embodiment having an a priori specified timer that provides real-time or pseudo real-time of output data and an enhanced metric for selecting an optimal encoding technique;

FIG. 9 is a block diagram of a content independent data compression system according to another embodiment of the present invention having an encoding architecture comprising a plurality of sets of serially cascaded encoders;

FIGS. 10a and 10b comprise a flow diagram of a data compression method according to another aspect of the present invention, which illustrates the operation of the data compression system of FIG. 9;

FIG. 11 is block diagram of a content independent data decompression system according to one embodiment of the present invention;

FIG. 12 is a flow diagram of a data decompression method according to one aspect of the present invention, which illustrates the operation of the data compression system of FIG. 11;

FIGS. 13a and 13b comprise a block diagram of a data compression system comprising content dependent and content independent data compression, according to an embodiment of the present invention;

FIGS. 14a-14d comprise a flow diagram of a data compression method using both content dependent and content independent data compression, according to one aspect of the present invention;

FIGS. 15a and 15b comprise a block diagram of a data compression system comprising content dependent and content independent data compression, according to another embodiment of the present invention;

FIGS. 16a-16d comprise a flow diagram of a data compression method using both content dependent and content independent data compression, according to another aspect of the present invention;

FIGS. 17a and 17b comprise a block diagram of a data compression system comprising content dependent and content independent data compression, according to another embodiment of the present invention; and

FIGS. 18a-18d comprise a flow diagram of a data compression method using both content dependent and content independent data compression, according to another aspect of the present invention.

The present invention is directed to systems and methods for providing data compression and decompression using content independent and content dependent data compression and decompression. In the following description, it is to be understood that system elements having equivalent or similar functionality are designated with the same reference numerals in the Figures. It is to be further understood that the present invention may be implemented in various forms of hardware, software, firmware, or a combination thereof. In particular, the system modules described herein are preferably implemented in software as an application program that is executable by, e.g., a general purpose computer or any machine or device having any suitable and preferred microprocessor architecture. Preferably, the present invention is implemented on a computer platform including hardware such as one or more central processing units (CPU), a random access memory (RAM), and input/output (I/O) interface(s). The computer platform also includes an operating system and microinstruction code. The various processes and functions described herein may be either part of the microinstruction code or application programs which are executed via the operating system. In addition, various other peripheral devices may be connected to the computer platform such as an additional data storage device and a printing device.

It is to be further understood that, because some of the constituent system components described herein are preferably implemented as software modules, the actual system connections shown in the Figures may differ depending upon the manner in which the systems are programmed. It is to be appreciated that special purpose microprocessors may be employed to implement the present invention. Given the teachings herein, one of ordinary skill in the related art will be able to contemplate these and similar implementations or configurations of the present invention.

Referring now to FIG. 2 a block diagram illustrates a content independent data compression system according to one embodiment of the present invention. The data compression system includes a counter module 10 that receives as input an uncompressed or compressed data stream. It is to be understood that the system processes the input data stream in data blocks that may range in size from individual bits through complete files or collections of multiple files. Additionally, the data block size may be fixed or variable. The counter module 10 counts the size of each input data block (i.e., the data block size is counted in bits, bytes, words, any convenient data multiple or metric, or any combination thereof).

An input data buffer 20, operatively connected to the counter module 10, may be provided for buffering the input data stream in order to output an uncompressed data stream in the event that, as discussed in further detail below, every encoder fails to achieve a level of compression that exceeds an a priori specified minimum compression ratio threshold. It is to be understood that the input data buffer 20 is not required for implementing the present invention.

An encoder module 30 is operatively connected to the buffer 20 and comprises a set of encoders E1, E2, E3 . . . En. The encoder set E1, E2, E3 . . . En may include any number “n” of those lossless encoding techniques currently well known within the art such as run length, Huffman, Lempel-Ziv Dictionary Compression, arithmetic coding, data compaction, and data null suppression. It is to be understood that the encoding techniques are selected based upon their ability to effectively encode different types of input data. It is to be appreciated that a full complement of encoders are preferably selected to provide a broad coverage of existing and future data types.

The encoder module 30 successively receives as input each of the buffered input data blocks (or unbuffered input data blocks from the counter module 10). Data compression is performed by the encoder module 30 wherein each of the encoders E1 . . . En processes a given input data block and outputs a corresponding set of encoded data blocks. It is to be appreciated that the system affords a user the option to enable/disable any one or more of the encoders E1 . . . En prior to operation. As is understood by those skilled in the art, such feature allows the user to tailor the operation of the data compression system for specific applications. It is to be further appreciated that the is encoding process may be performed either in parallel or sequentially. In particular, the encoders E1 through En of encoder module 30 may operate in parallel (i.e., simultaneously processing a given input data block by utilizing task multiplexing on a single central processor, via dedicated hardware, by executing on a plurality of processor or dedicated hardware systems, or any combination thereof). In addition, encoders E1 through En may operate sequentially on a given unbuffered or buffered input data block. This process is intended to eliminate the complexity and additional processing overhead associated with multiplexing concurrent encoding techniques on a single central processor and/or dedicated hardware, set of central processors and/or dedicated hardware, or any achievable combination. It is to be further appreciated that encoders of the identical type may be applied in parallel to enhance encoding speed. For instance, encoder E1 may comprise two parallel Huffman encoders for parallel processing of an input data block.

A buffer/counter module 40 is operatively connected to the encoding module 30 for buffering and counting the size of each of the encoded data blocks output from encoder module 30. Specifically, the buffer/counter 30 comprises a plurality of buffer/counters BC1, BC2, BC3 . . . BCn, each operatively associated with a corresponding one of the encoders E1 . . . En. A compression ratio module 50, operatively connected to the output buffer/counter 40, determines the compression ratio obtained for each of the enabled encoders E1 . . . En by taking the ratio of the size of the input data block to the size of the output data block stored in the corresponding buffer/counters BC1 . . . BCn. In addition, the compression ratio module 50 compares each compression ratio with an a priori-specified compression ratio threshold limit to determine if at least one of the encoded data blocks output from the enabled encoders E1 . . . En achieves a compression that exceeds an a priori-specified threshold. As is understood by those skilled in the art, the threshold limit may be specified as any value inclusive of data expansion, no data compression or expansion, or any arbitrarily desired compression limit. A description module 60, operatively coupled to the compression ratio module 50, appends a corresponding compression type descriptor to each encoded data block which is selected for output so as to indicate the type of compression format of the encoded data block.

The operation of the data compression system of FIG. 2 will now be discussed in is further detail with reference to the flow diagram of FIGS. 3a and 3b. A data stream comprising one or more data blocks is input into the data compression system and the first data block in the stream is received (step 300). As stated above, data compression is performed on a per data block basis. Accordingly, the first input data block in the input data stream is input into the counter module 10 that counts the size of the data block (step 302). The data block is then stored in the buffer 20 (step 304). The data block is then sent to the encoder module 30 and compressed by each (enabled) encoder E1 . . . En (step 306). Upon completion of the encoding of the input data block, an encoded data block is output from each (enabled) encoder E1 . . . En and maintained in a corresponding buffer (step 308), and the encoded data block size is counted (step 310).

Next, a compression ratio is calculated for each encoded data block by taking the ratio of the size of the input data block (as determined by the input counter 10) to the size of each encoded data block output from the enabled encoders (step 312). Each compression ratio is then compared with an a priori-specified compression ratio threshold (step 314). It is to be understood that the threshold limit may be specified as any value inclusive of data expansion, no data compression or expansion, or any arbitrarily desired compression limit. It is to be further understood that notwithstanding that the current limit for lossless data compression is the entropy limit (the present definition of information content) for the data, the present invention does not preclude the use of future developments in lossless data compression that may increase lossless data compression ratios beyond what is currently known within the art.

After the compression ratios are compared with the threshold, a determination is s made as to whether the compression ratio of at least one of the encoded data blocks exceeds the threshold limit (step 316). If there are no encoded data blocks having a compression ratio that exceeds the compression ratio threshold limit (negative determination in step 316), then the original unencoded input data block is selected for output and a null data compression type descriptor is appended thereto (step 318). A null data compression type descriptor is defined as any recognizable data token or descriptor that indicates no data encoding has been applied to the input data block. Accordingly, the unencoded input data block with its corresponding null data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 320).

On the other hand, if one or more of the encoded data blocks possess a compression ratio greater than the compression ratio threshold limit (affirmative result in step 316), then the encoded data block having the greatest compression ratio is selected (step 322). An appropriate data compression type descriptor is then appended (step 324). A data compression type descriptor is defined as any recognizable data token or descriptor that indicates which data encoding technique has been applied to the data. It is to be understood that, since encoders of the identical type may be applied in parallel to enhance encoding speed (as discussed above), the data compression type descriptor identifies the corresponding encoding technique applied to the encoded data block, not necessarily the specific encoder. The encoded data block having the greatest compression ratio along with its corresponding data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 326).

After the encoded data block or the unencoded data input data block is output (steps 326 and 320), a determination is made as to whether the input data stream contains additional data blocks to be processed (step 328). If the input data stream includes additional data blocks (affirmative result in step 328), the next successive data block is received (step 330), its block size is counted (return to step 302) and the data compression process in repeated. This process is iterated for each data block in the input data stream. Once the final input data block is processed (negative result in step 328), data compression of the input data stream is finished (step 322).

Since a multitude of data types may be present within a given input data block, it is often difficult and/or impractical to predict the level of compression that will be achieved by a specific encoder. Consequently, by processing the input data blocks with a plurality of encoding techniques and comparing the compression results, content free data compression is advantageously achieved. It is to be appreciated that this approach is scalable through future generations of processors, dedicated hardware, and software. As processing capacity increases and costs reduce, the benefits provided by the present invention will continue to increase. It should again be noted that the present invention may employ any lossless data encoding technique.

Referring now to FIG. 4, a block diagram illustrates a content independent data compression system according to another embodiment of the present invention. The data compression system depicted in FIG. 4 is similar to the data compression system of FIG. 2 except that the embodiment of FIG. 4 includes an enhanced metric functionality for selecting an optimal encoding technique. In particular, each of the encoders E1 . . . En in the encoder module 30 is tagged with a corresponding one of user-selected encoder desirability factors 70. Encoder desirability is defined as an a priori user specified factor that takes into account any number of user considerations including, but not limited to, compatibility of the encoded data with existing standards, data error robustness, or any other aggregation of factors that the user wishes to consider for a particular application. Each encoded data block output from the encoder module 30 has a corresponding desirability factor appended thereto. A figure of merit module 80, operatively coupled to the compression ratio module 50 and the descriptor module 60, is provided for calculating a figure of merit for each of the encoded data blocks which possess a compression ratio greater than the compression ratio threshold limit. The figure of merit for each encoded data block is comprised of a weighted average of the a priori user specified threshold and the corresponding encoder desirability factor. As discussed below in further detail with reference to FIGS. 5a and 5b, the figure of merit substitutes the a priori user compression threshold limit for selecting and outputting encoded data blocks.

The operation of the data compression system of FIG. 4 will now be discussed in further detail with reference to the flow diagram of FIGS. 5a and 5b. A data stream comprising one or more data blocks is input into the data compression system and the first data block in the stream is received (step 500). The size of the first data block is then determined by the counter module 10 (step 502). The data block is then stored in the buffer 20 (step 504). The data block is then sent to the encoder module 30 and compressed by each (enabled) encoder in the encoder set E1 . . . En (step 506). Each encoded data block processed in the encoder module 30 is tagged with an encoder desirability factor that corresponds the particular encoding technique applied to the encoded data block (step 508). Upon completion of the encoding of the input data block, an encoded data block with its corresponding desirability factor is output from each (enabled) encoder E1 . . . En and maintained in a corresponding buffer (step 510), and the encoded data block size is counted (step 512).

Next, a compression ratio obtained by each enabled encoder is calculated by taking the ratio of the size of the input data block (as determined by the input counter 10) to the size of the encoded data block output from each enabled encoder (step 514). Each compression ratio is then compared with an a priori-specified compression ratio threshold (step 516). A determination is made as to whether the compression ratio of at least one of the encoded data blocks exceeds the threshold limit (step 518). If there are no encoded data blocks having a compression ratio that exceeds the compression ratio threshold limit (negative determination in step 518), then the original unencoded input data block is selected for output and a null data compression type descriptor (as discussed above) is appended thereto (step 520). Accordingly, the original unencoded input data block with its corresponding null data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 522).

On the other hand, if one or more of the encoded data blocks possess a compression ratio greater than the compression ratio threshold limit (affirmative result in step 518), then a figure of merit is calculated for each encoded data block having a compression ratio which exceeds the compression ratio threshold limit (step 524). Again, the figure of merit for a given encoded data block is comprised of a weighted average of the a priori user specified threshold and the corresponding encoder desirability factor associated with the encoded data block. Next, the encoded data block having the greatest figure of merit is selected for output (step 526). An appropriate data compression type descriptor is then appended (step 528) to indicate the data encoding technique applied to the encoded data block. The encoded data block (which has the greatest figure of merit) along with its corresponding data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 530).

After the encoded data block or the unencoded input data block is output (steps 530 and 522), a determination is made as to whether the input data stream contains additional data blocks to be processed (step 532). If the input data stream includes additional data blocks (affirmative result in step 532), then the next successive data block is received (step 534), its block size is counted (return to step 502) and the data compression process is iterated for each successive data block in the input data stream. Once the final input data block is processed (negative result in step 532), data compression of the input data stream is finished (step 536).

Referring now to FIG. 6, a block diagram illustrates a data compression system according to another embodiment of the present invention. The data compression system depicted in FIG. 6 is similar to the data compression system discussed in detail above with reference to FIG. 2 except that the embodiment of FIG. 6 includes an a priori specified timer that provides real-time or pseudo real-time output data. In particular, an interval timer 90, operatively coupled to the encoder module 30, is preloaded with a user specified time value. The role of the interval timer (as will be explained in greater detail below with reference to FIGS. 7a and 7b) is to limit the processing time for each input data block processed by the encoder module 30 so as to ensure that the real-time, pseudo real-time, or other time critical nature of the data compression processes is preserved.

The operation of the data compression system of FIG. 6 will now be discussed in further detail with reference to the flow diagram of FIGS. 7a and 7b. A data stream comprising one or more data blocks is input into the data compression system and the first data block in the data stream is received (step 700), and its size is determined by the counter module 10 (step 702). The data block is then stored in buffer 20 (step 704).

Next, concurrent with the completion of the receipt and counting of the first data block, the interval timer 90 is initialized (step 706) and starts counting towards a user-specified time limit. The input data block is then sent to the encoder module 30 wherein data compression of the data block by each (enabled) encoder E1 . . . En commences (step 708). Next, a determination is made as to whether the user specified time expires before the completion of the encoding process (steps 710 and 712). If the encoding process is completed before or at the expiration of the timer, i.e., each encoder (E1 through En) completes its respective encoding process (negative result in step 710 and affirmative result in step 712), then an encoded data block is output from each (enabled) encoder E1 . . . En and maintained in a corresponding buffer (step 714).

On the other hand, if the timer expires (affirmative result in 710), the encoding process is halted (step 716). Then, encoded data blocks from only those enabled encoders E1 . . . En that have completed the encoding process are selected and maintained in buffers (step 718). It is to be appreciated that it is not necessary (or in some cases desirable) that some or all of the encoders complete the encoding process before the interval timer expires. Specifically, due to encoder data dependency and natural variation, it is possible that certain encoders may not operate quickly enough and, therefore, do not comply with the timing constraints of the end use. Accordingly, the time limit ensures that the real-time or pseudo real-time nature of the data encoding is preserved.

After the encoded data blocks are buffered (step 714 or 718), the size of each encoded data block is counted (step 720). Next, a compression ratio is calculated for each encoded data block by taking the ratio of the size of the input data block (as determined by the input counter 10) to the size of the encoded data block output from each enabled encoder (step 722). Each compression ratio is then compared with an a priori-specified compression ratio threshold (step 724). A determination is made as to whether the compression ratio of at least one of the encoded data blocks exceeds the threshold limit (step 726). If there are no encoded data blocks having a compression ratio that exceeds the compression ratio threshold limit (negative determination in step 726), then the original unencoded input data block is selected for output and a null data compression type descriptor is appended thereto (step 728). The original unencoded input data block with its corresponding null data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 730).

On the other hand, if one or more of the encoded data blocks possess a compression ratio greater than the compression ratio threshold limit (affirmative result in step 726), then the encoded data block having the greatest compression ratio is selected (step 732). An appropriate data compression type descriptor is then appended (step 734). The encoded data block having the greatest compression ratio along with its corresponding data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 736).

After the encoded data block or the unencoded input data block is output (steps 730 or 736), a determination is made as to whether the input data stream contains additional data blocks to be processed (step 738). If the input data stream includes additional data blocks (affirmative result in step 738), the next successive data block is received (step 740), its block size is counted (return to step 702) and the data compression process in repeated. This process is iterated for each data block in the input data stream, with each data block being processed within the user-specified time limit as discussed above. Once the final input data block is processed (negative result in step 738), data compression of the input data stream is complete (step 742).

Referring now to FIG. 8, a block diagram illustrates a content independent data compression system according to another embodiment of the present system. The data compression system of FIG. 8 incorporates all of the features discussed above in connection with the system embodiments of FIGS. 2, 4, and 6. For example, the system of FIG. 8 incorporates both the a priori specified timer for providing real-time or pseudo real-time of output data, as well as the enhanced metric for selecting an optimal encoding technique. Based on the foregoing discussion, the operation of the system of FIG. 8 is understood by those skilled in the art.

Referring now to FIG. 9, a block diagram illustrates a data compression system according to a preferred embodiment of the present invention. The system of FIG. 9 contains many of the features of the previous embodiments discussed above. However, this embodiment advantageously includes a cascaded encoder module 30c having an encoding architecture comprising a plurality of sets of serially cascaded encoders Em,n, where “m” refers to the encoding path (i.e., the encoder set) and where “n” refers to the number of encoders in the respective path. It is to be understood that each set of serially cascaded encoders can include any number of disparate and/or similar encoders (i.e., n can be any value for a given path m).

The system of FIG. 9 also includes a output buffer module 40c which comprises a plurality of buffer/counters B/Cm,n, each associated with a corresponding one of the encoders Em,n. In this embodiment, an input data block is sequentially applied to successive encoders (encoder stages) in the encoder path so as to increase the data compression ratio. For example, the output data block from a first encoder E1,1, is buffered and counted in B/C1,1, for subsequent processing by a second encoder E1,2. Advantageously, these parallel sets of sequential encoders are applied to the input data stream to effect content free lossless data compression. This embodiment provides for multi-stage sequential encoding of data with the maximum number of encoding steps subject to the available real-time, pseudo real-time, or other timing constraints.

As with each previously discussed embodiment, the encoders Em,n may include those lossless encoding techniques currently well known within the art, including: run length, Huffman, Lempel-Ziv Dictionary Compression, arithmetic coding, data compaction, and data null suppression. Encoding techniques are selected based upon their ability to effectively encode different types of input data. A full complement of encoders provides for broad coverage of existing and future data types. The input data blocks may be applied simultaneously to the encoder paths (i.e., the encoder paths may operate in parallel, utilizing task multiplexing on a single central processor, or via dedicated hardware, or by executing on a plurality of processor or dedicated hardware systems, or any combination thereof). In addition, an input data block may be sequentially applied to the encoder paths. Moreover, each serially cascaded encoder path may comprise a fixed (predetermined) sequence of encoders or a random sequence of encoders. Advantageously, by simultaneously or sequentially processing input data blocks via a plurality of sets of serially cascaded encoders, content free data compression is achieved.

The operation of the data compression system of FIG. 9 will now be discussed in further detail with reference to the flow diagram of FIGS. 10a and 10b. A data stream comprising one or more data blocks is input into the data compression system and the first data block in the data stream is received (step 100), and its size is determined by the counter module 10 (step 102). The data block is then stored in buffer 20 (step 104).

Next, concurrent with the completion of the receipt and counting of the first data block, the interval timer 90 is initialized (step 106) and starts counting towards a user-specified time limit. The input data block is then sent to the cascade encoder module 30C wherein the input data block is applied to the first encoder (i.e., first encoding stage) in each of the cascaded encoder paths E1,1 . . . Em,1 (step 108). Next, a determination is made as to whether the user specified time expires before the completion of the first stage encoding process (steps 110 and 112). If the first stage encoding process is completed before the expiration of the timer, i.e., each encoder (E1,1 . . . Em,1) completes its respective encoding process (negative result in step 110 and affirmative result in step 112), then an encoded data block is output from each encoder E1,1 . . . Em,1 and maintained in a corresponding buffer (step 114). Then for each cascade encoder path, the output of the completed encoding stage is applied to the next successive encoding stage in the cascade path (step 116). This process (steps 110, 112, 114, and 116) is repeated until the earlier of the timer expiration (affirmative result in step 110) or the completion of encoding by each encoder stage in the serially cascaded paths, at which time the encoding process is halted (step 118).

Then, for each cascade encoder path, the buffered encoded data block output by the last encoder stage that completes the encoding process before the expiration of the timer is selected for further processing (step 120). Advantageously, the interim stages of the multi-stage data encoding process are preserved. For example, the results of encoder E1,1 are preserved even after encoder E1,2 begins encoding the output of encoder E1,1. If the interval timer expires after encoder E1,1 completes its respective encoding process but before encoder E1,2 completes its respective encoding process, the encoded data block from encoder E1,1 is complete and is utilized for calculating the compression ratio for the corresponding encoder path. The incomplete encoded data block from encoder E1,2 is either discarded or ignored.

It is to be appreciated that it is not necessary (or in some cases desirable) that some or all of the encoders in the cascade encoder paths complete the encoding process before the interval timer expires. Specifically, due to encoder data dependency, natural variation and the sequential application of the cascaded encoders, it is possible that certain encoders may not operate quickly enough and therefore do not comply with the timing constraints of the end use. Accordingly, the time limit ensures that the real-time or pseudo real-time nature of the data encoding is preserved.

After the encoded data blocks are selected (step 120), the size of each encoded data block is counted (step 122). Next, a compression ratio is calculated for each encoded data block by taking the ratio of the size of the input data block (as determined by the input counter 10) to the size of the encoded data block output from each encoder (step 124). Each compression ratio is then compared with an a priori-specified compression ratio threshold (step 126). A determination is made as to whether the compression ratio of at least one of the encoded data blocks exceeds the threshold limit (step 128). If there are no encoded data blocks having a compression ratio that exceeds the compression ratio threshold limit (negative determination in step 128), then the original unencoded input data block is selected for output and a null data compression type descriptor is appended thereto (step 130). The original unencoded data block and its corresponding null data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 132).

On the other hand, if one or more of the encoded data blocks possess a compression ratio greater than the compression ratio threshold limit (affirmative result in step 128), then a figure of merit is calculated for each encoded data block having a compression ratio which exceeds the compression ratio threshold limit (step 134). Again, the figure of merit for a given encoded data block is comprised of a weighted average of the a priori user specified threshold and the corresponding encoder desirability factor associated with the encoded data block. Next, the encoded data block having the greatest figure of merit is selected (step 136). An appropriate data compression type descriptor is then appended (step 138) to indicate the data encoding technique applied to the encoded data block. For instance, the data type compression descriptor can indicate that the encoded data block was processed by either a single encoding type, a plurality of sequential encoding types, and a plurality of random encoding types. The encoded data block (which has the greatest figure of merit) along with its corresponding data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 140).

After the unencoded data block or the encoded data input data block is output (steps 132 and 140), a determination is made as to whether the input data stream contains additional data blocks to be processed (step 142). If the input data stream includes additional data blocks (affirmative result in step 142), then the next successive data block is received (step 144), its block size is counted (return to step 102) and the data compression process is iterated for each successive data block in the input data stream. Once the final input data block is processed (negative result in step 142), data compression of the input data stream is finished (step 146).

Referring now to FIG. 11, a block diagram illustrates a data decompression system according to one embodiment of the present invention. The data decompression system preferably includes an input buffer 1100 that receives as input an uncompressed or compressed data stream comprising one or more data blocks. The data blocks may range in size from individual bits through complete files or collections of multiple files. Additionally, the data block size may be fixed or variable. The input data buffer 1100 is preferably included (not required) to provide storage of input data for various hardware implementations. A descriptor extraction module 1102 receives the buffered (or unbuffered) input data block and then parses, lexically, syntactically, or otherwise analyzes the input data block using methods known by those skilled in the art to extract the data compression type descriptor associated with the data block. The data compression type descriptor may possess values corresponding to null (no encoding applied), a single applied encoding technique, or multiple encoding techniques applied in a specific or random order (in accordance with the data compression system embodiments and methods discussed above).

A decoder module 1104 includes a plurality of decoders D1 . . . Dn for decoding the input data block using a decoder, set of decoders, or a sequential set of decoders corresponding to the extracted compression type descriptor. The decoders D1 . . . Dn may include those lossless encoding techniques currently well known within the art, including: run length, Huffman, Lempel-Ziv Dictionary Compression, arithmetic coding, data compaction, and data null suppression. Decoding techniques are selected based upon their ability to effectively decode the various different types of encoded input data generated by the data compression systems described above or originating from any other desired source. As with the data compression systems discussed above, the decoder module 1104 may include multiple decoders of the same type applied in parallel so as to reduce the data decoding time.

The data decompression system also includes an output data buffer 1106 for buffering the decoded data block output from the decoder module 1104.

The operation of the data decompression system of FIG. 11 will be discussed in further detail with reference to the flow diagram of FIG. 12. A data stream comprising one or more data blocks of compressed or uncompressed data is input into the data decompression system and the first data block in the stream is received (step 1200) and maintained in the buffer (step 1202). As with the data compression systems discussed above, data decompression is performed on a per data block basis. The data compression type descriptor is then extracted from the input data block (step 1204). A determination is then made as to whether the data compression type descriptor is null (step 1206). If the data compression type descriptor is determined to be null (affirmative result in step 1206), then no decoding is applied to the input data block and the original undecoded data block is output (or maintained in the output buffer) (step 1208).

On the other hand, if the data compression type descriptor is determined to be any value other than null (negative result in step 1206), the corresponding decoder or decoders are then selected (step 1210) from the available set of decoders D1 . . . Dn in the decoding module 1104. It is to be understood that the data compression type descriptor may mandate the application of: a single specific decoder, an ordered sequence of specific decoders, a random order of specific decoders, a class or family of decoders, a mandatory or optional application of parallel decoders, or any combination or permutation thereof. The input data block is then decoded using the selected decoders (step 1212), and output (or maintained in the output buffer 1106) for subsequent data processing, storage, or transmittal (step 1214). A determination is then made as to whether the input data stream contains additional data blocks to be processed (step 1216). If the input data stream includes additional data blocks (affirmative result in step 1216), the next successive data block is received (step 1220), and buffered (return to step 1202). Thereafter, the data decompression process is iterated for each data block in the input data stream. Once the final input data block is processed (negative result in step 1216), data decompression of the input data stream is finished (step 1218).

In other embodiments of the present invention described below, data compression is achieved using a combination of content dependent data compression and content independent data compression. For example, FIGS. 13a and 13b are block diagrams illustrating a data compression system employing both content independent and content dependent data compression according to one embodiment of the present invention, wherein content independent data compression is applied to a data block when the content of the data block cannot be identified or is not associable with a specific data compression algorithm. The data compression system comprises a counter module 10 that receives as input an uncompressed or compressed data stream. It is to be understood that the system processes the input data stream in data blocks that may range in size from individual bits through complete files or collections of multiple files. Additionally, the data block size may be fixed or variable. The counter module 10 counts the size of each input data block (i.e., the data block size is counted in bits, bytes, words, any convenient data multiple or metric, or any combination thereof).

An input data buffer 20, operatively connected to the counter module 10, may be provided for buffering the input data stream in order to output an uncompressed data stream in the event that, as discussed in further detail below, every encoder fails to achieve a level of compression that exceeds a priori specified content independent or content dependent minimum compression ratio thresholds. It is to be understood that the input data buffer 20 is not required for implementing the present invention.

A content dependent data recognition module 1300 analyzes the incoming data stream to recognize data types, data structures, data block formats, file substructures, file types, and/or any other parameters that may be indicative of either the data type/content of a given data block or the appropriate data compression algorithm or algorithms (in serial or in parallel) to be applied. Optionally, a data file recognition list(s) or algorithm(s) 1310 module may be employed to hold and/or determine associations between recognized data parameters and appropriate algorithms. Each data block that is recognized by the content data compression module 1300 is routed to a content dependent encoder module 1320, if not the data is routed to the content independent encoder module 30.

A content dependent encoder module 1320 is operatively connected to the content dependent data recognition module 1300 and comprises a set of encoders D1, D2, D3 . . . Dm. The encoder set D1, D2, D3 . . . Dm may include any number “n” of those lossless or lossy encoding techniques currently well known within the art such as MPEG4, various voice codecs, MPEG3, AC3, AAC, as well as lossless algorithms such as run length, Huffinan, Lempel-Ziv Dictionary Compression, arithmetic coding, data compaction, and data null suppression. It is to be understood that the encoding techniques are selected based upon their ability to effectively encode different types of input data. It is to be appreciated that a full complement of encoders and or codecs are preferably selected to provide a broad coverage of existing and future data types.

The content independent encoder module 30, which is operatively connected to the content dependent data recognition module 1300, comprises a set of encoders E1, E2, E3 . . . En. The encoder set E1, E2, E3 . . . En may include any number “n” of those lossless encoding techniques currently well known within the art such as run length, Huffman, Lempel-Ziv Dictionary Compression, arithmetic coding, data compaction, and data null suppression. Again, it is to be understood that the encoding techniques are selected based upon their ability to effectively encode different types of input data. It is to be appreciated that a full complement of encoders are preferably selected to provide a broad coverage of existing and future data types.

The encoder modules (content dependent 1320 and content independent 30) selectively receive the buffered input data blocks (or unbuffered input data blocks from the counter module 10) from module 1300 based on the results of recognition. Data compression is performed by the respective encoder modules wherein some or all of the encoders D1 . . . Dm or E1 . . . En processes a given input data block and outputs a corresponding set of encoded data blocks. It is to be appreciated that the system affords a user the option to enable/disable any one or more of the encoders D1 . . . Dm and E1 . . . En prior to operation. As is understood by those skilled in the art, such feature allows the user to tailor the operation of the data compression system for specific applications. It is to be further appreciated that the encoding process may be performed either in parallel or sequentially. In particular, the encoder set D1 through Dm of encoder module 1320 and/or the encoder set E1 through En of encoder module 30 may operate in parallel (i.e., simultaneously processing a given input data block by utilizing task multiplexing on a single central processor, via dedicated hardware, by executing on a plurality of processor or dedicated hardware systems, or any combination thereof). In addition, encoders D1 through Dm and E1 through En may operate sequentially on a given unbuffered or buffered input data block. This process is intended to eliminate the complexity and additional processing overhead associated with multiplexing concurrent encoding techniques on a single central processor and/or dedicated hardware, set of central processors and/or dedicated hardware, or any achievable combination. It is to be further appreciated that encoders of the identical type may be applied in parallel to enhance encoding speed. For instance, encoder E1 may comprise two parallel Huffman encoders for parallel processing of an input data block. It should be further noted that one or more algorithms may be implemented in dedicated hardware such as an MPEG4 or MP3 encoding integrated circuit.

Buffer/counter modules 1330 and 40 are operatively connected to their respective encoding modules 1320 and 30, for buffering and counting the size of each of the encoded data blocks output from the respective encoder modules. Specifically, the content dependent buffer/counter 1330 comprises a plurality of buffer/counters BCD1, BCD2, BCD3 . . . BCDm, each operatively associated with a corresponding one of the encoders D1 . . . Dm. Similarly the content independent buffer/counters BCE1, BCE2, BCE3 . . . BCEn, each operatively associated with a corresponding one of the encoders E1 . . . En. A compression ratio module 1340, operatively connected to the content dependent output buffer/counters 1330 and content independent buffer/counters 40 determines the compression ratio obtained for each of the enabled encoders D1 . . . Dm and or E1 . . . En by taking the ratio of the size of the input data block to the size of the output data block stored in the corresponding buffer/counters BCD1, BCD2, BCD3 . . . BCDm and or BCE1, BCE2, BCE3 . . . BCEn. In addition, the compression ratio module 1340 compares each compression ratio with an a priori-specified compression ratio threshold limit to determine if at least one of the encoded data blocks output from the enabled encoders BCD1, BCD2, BCD3 . . . BCDm and or BCE1, BCE2, BCE3 . . . BCEn achieves a compression that meets an a priori-specified threshold. As is. understood by those skilled in the art, the threshold limit maybe specified as any value inclusive of data expansion, no data compression or expansion, or any arbitrarily desired compression limit. It should be noted that different threshold values may be applied to content dependent and content independent encoded data. Further these thresholds may be adaptively modified based upon enabled encoders in either or both the content dependent or content independent encoder sets, along with any associated parameters. A compression type description module 1350, operatively coupled to the compression ratio module 1340, appends a corresponding compression type descriptor to each encoded data block which is selected for output so as to indicate the type of compression format of the encoded data block.

A mode of operation of the data compression system of FIGS. 13a and 13b will now be discussed with reference to the flow diagrams of FIGS. 14a-14d, which illustrates a method for performing data compression using a combination of content dependent and content independent data compression. In general, content independent data compression is applied to a given data block when the content of a data block cannot be identified or is not associated with a specific data compression algorithm. More specifically, referring to FIG. 14a, a data stream comprising one or more data blocks is input into the data compression system and the first data block in the stream is received (step 1400). As stated above, data compression is performed on a per data block basis. As previously stated a data block may represent any quantity of data from a single bit through a multiplicity of files or packets and may vary from block to block. Accordingly, the first input data block in the input data stream is input into the counter module 10 that counts the size of the data block (step 1402). The data block is then stored in the buffer 20 (step 1404). The data block is then analyzed on a per block or multi-block basis by the content dependent data recognition module 1300 (step 1406). If the data stream content is not recognized utilizing the recognition list(s) or algorithms(s) module 1310 (step 1408) the data is routed to the content independent encoder module 30 and compressed by each (enabled) encoder E1 . . . En (step 1410). Upon completion of the encoding of the input data block, an encoded data block is output from each (enabled) encoder E1 . . . En and maintained in a corresponding buffer (step 1412), and the encoded data block size is counted (step 1414).

Next, a compression ratio is calculated for each encoded data block by taking the ratio of the size of the input data block (as determined by the input counter 10 to the size of each encoded data block output from the enabled encoders (step 1416). Each compression ratio is then compared with an apriori-specified compression ratio threshold (step 1418). It is to be understood that the threshold limit may be specified as any value inclusive of data expansion, no data compression or expansion, or any arbitrarily desired compression limit. It is to be further understood that notwithstanding that the current limit for lossless data compression is the entropy limit (the present definition of information content) for the data, the present invention does not preclude the use of future developments in lossless data compression that may increase lossless data compression ratios beyond what is currently known within the art. Additionally the content independent data compression threshold may be different from the content dependent threshold and either may be modified by the specific enabled encoders.

After the compression ratios are compared with the threshold, a determination is made as to whether the compression ratio of at least one of the encoded data blocks exceeds the threshold limit (step 1420). If there are no encoded data blocks having a compression ratio that exceeds the compression ratio threshold limit (negative determination in step 1420), then the original unencoded input data block is selected for output and a null data compression type descriptor is appended thereto (step 1434). A null data compression type descriptor is defined as any recognizable data token or descriptor that indicates no data encoding has been applied to the input data block. Accordingly, the unencoded input data block with its corresponding null data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 1436).

On the other hand, if one or more of the encoded data blocks possess a compression ratio greater than the compression ratio threshold limit (affirmative result in step 1420), then the encoded data block having the greatest compression ratio is selected (step 1422). An appropriate data compression type descriptor is then appended (step 1424). A data compression type descriptor is defined as any recognizable data token or descriptor that indicates which data encoding technique has been applied to the data. It is to be understood that, since encoders of the identical type may be applied in parallel to enhance encoding speed (as discussed above), the data compression type descriptor identifies the corresponding encoding technique applied to the encoded data block, not necessarily the specific encoder. The encoded data block having the greatest compression ratio along with its corresponding data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 1426).

As previously stated the data block stored in the buffer 20 (step 1404) is analyzed on a per block or multi-block basis by the content dependent data recognition module 1300 (step 1406). If the data stream content is recognized utilizing the recognition list(s) or algorithms(s) module 1310 (step 1434) the appropriate content dependent algorithms are enabled and initialized (step 1436), and the data is routed to the content dependent encoder module 1320 and compressed by each (enabled) encoder D1 . . . Dm (step 1438). Upon completion of the encoding of the input data block, an encoded data block is output from each (enabled) encoder D1 . . . Dm and maintained in a corresponding buffer (step 1440), and the encoded data block size is counted (step 1442).

Next, a compression ratio is calculated for each encoded data block by taking the ratio of the size of the input data block (as determined by the input counter 10 to the size of each encoded data block output from the enabled encoders (step 1444). Each compression ratio is then compared with an a priori-specified compression ratio threshold (step 1448). It is to be understood that the threshold limit may be specified as any value inclusive of data expansion, no data compression or expansion, or any arbitrarily desired compression limit. It is to be further understood that many of these algorithms may be lossy, and as such the limits may be subject to or modified by an end target storage, listening, or viewing device. Further notwithstanding that the current limit for lossless data compression is the entropy limit (the present definition of information content) for the data, the present invention does not preclude the use of future developments in lossless data compression that may increase lossless data compression ratios beyond what is currently known within the art. Additionally the content independent data compression threshold may be different from the content dependent threshold and either may be modified by the specific enabled encoders.

After the compression ratios are compared with the threshold, a determination is made as to whether the compression ratio of at least one of the encoded data blocks exceeds the threshold limit (step 1420). If there are no encoded data blocks having a compression ratio that exceeds the compression ratio threshold limit (negative determination in step 1420), then the original unencoded input data block is selected for output and a null data compression type descriptor is appended thereto (step 1434). A null data compression type descriptor is defined as any recognizable data token or descriptor that indicates no data encoding has been applied to the input data block. Accordingly, the unencoded input data block with its corresponding null data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 1436).

On the other hand, if one or more of the encoded data blocks possess a compression ratio greater than the compression ratio threshold limit (affirmative result in step 1420), then the encoded data block having the greatest compression ratio is selected (step 1422). An appropriate data compression type descriptor is then appended (step 1424). A data compression type descriptor is defined as any recognizable data token or descriptor that indicates which data encoding technique has been applied to the data. It is to be understood that, since encoders of the identical type may be applied in parallel to enhance encoding speed (as discussed above), the data compression type descriptor identifies the corresponding encoding technique applied to the encoded data block, not necessarily the specific encoder. The encoded data block having the greatest compression ratio along with its corresponding data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 1426).

After the encoded data block or the unencoded data input data block is output (steps 1426 and 1436), a determination is made as to whether the input data stream contains additional data blocks to be processed (step 1428). If the input data stream includes additional data blocks (affirmative result in step 1428), the next successive data block is received (step 1432), its block size is counted (return to step 1402) and the data compression process in repeated. This process is iterated for each data block in the input data stream. Once the final input data block is processed (negative result in step 1428), data compression of the input data stream is finished (step 1430).

Since a multitude of data types may be present within a given input data block, it is often difficult and/or impractical to predict the level of compression that will be achieved by a specific encoder. Consequently, by processing the input data blocks with a plurality of encoding techniques and comparing the compression results, content free data compression is advantageously achieved. Further the encoding may be lossy or lossless dependent upon the input data types. Further if the data type is not recognized the default content independent lossless compression is applied. It is not a requirement that this process be deterministic—in fact a certain probability may be applied if occasional data loss is permitted. It is to be appreciated that this approach is scalable through future generations of processors, dedicated hardware, and software. As processing capacity increases and costs reduce, the benefits provided by the present invention will continue to increase. It should again be noted that the present invention may employ any lossless data encoding technique.

FIGS. 15a and 15b are block diagrams illustrating a data compression system employing both content independent and content dependent data compression according to another embodiment of the present invention. The system in FIGS. 15a and 15b is similar in operation to the system of FIGS. 13a and 13b in that content independent data compression is applied to a data block when the content of the data block cannot be identified or is not associable with a specific data compression algorithm. The system of FIGS. 15a and 15b additionally performs content independent data compression on a data block when the compression ratio obtained for the data block using the content dependent data compression does not meet a specified threshold.

A mode of operation of the data compression system of FIGS. 15a and 15b will now be discussed with reference to the flow diagram of FIGS. 16a-16d, which illustrates a method for performing data compression using a combination of content dependent and content independent data compression. A data stream comprising one or more data blocks is input into the data compression system and the first data block in the stream is received (step 1600). As stated above, data compression is performed on a per data block basis. As previously stated a data block may represent any quantity of data from a single bit through a multiplicity of files or packets and may vary from block to block. Accordingly, the first input data block in the input data stream is input into the counter module 10 that counts the size of the data block (step 1602). The data block is then stored in the buffer 20 (step 1604). The data block is then analyzed on a per block or multi-block basis by the content dependent data recognition module 1300 (step 1606). If the data stream content is not recognized utilizing the recognition list(s) or algorithms(s) module 1310 (step 1608) the data is routed to the content independent encoder module 30 and compressed by each (enabled) encoder E1 . . . En (step 1610). Upon completion of the encoding of the input data block, an encoded data block is output from each (enabled) encoder E1 . . . En and maintained in a corresponding buffer (step 1612), and the encoded data block size is counted (step 1614).

Next, a compression ratio is calculated for each encoded data block by taking the ratio of the size of the input data block (as determined by the input counter 10 to the size of each encoded data block output from the enabled encoders (step 1616). Each compression ratio is then compared with an a priori-specified compression ratio threshold (step 1618). It is to be understood that the threshold limit may be specified as any value inclusive of data expansion, no data compression or expansion, or any arbitrarily desired compression limit. It is to be further understood that notwithstanding that the current limit for lossless data compression is the entropy limit (the present definition of information content) for the data, the present invention does not preclude the use of future developments in lossless data compression that may increase lossless data compression ratios beyond what is currently known within the art. Additionally the content independent data compression threshold may be different from the content dependent threshold and either may be modified by the specific enabled encoders.

After the compression ratios are compared with the threshold, a determination is made as to whether the compression ratio of at least one of the encoded data blocks exceeds the threshold limit (step 1620). If there are no encoded data blocks having a compression ratio that exceeds the compression ratio threshold limit (negative determination in step 1620), then the original unencoded input data block is selected for output and a null data compression type descriptor is appended thereto (step 1634). A null data compression type descriptor is defined as any recognizable data token or descriptor that indicates no data encoding has been applied to the input data block. Accordingly, the unencoded input data block with its corresponding null data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 1636).

On the other hand, if one or more of the encoded data blocks possess a compression ratio greater than the compression ratio threshold limit (affirmative result in step 1620), then the encoded data block having the greatest compression ratio is selected (step 1622). An appropriate data compression type descriptor is then appended (step 1624). A data compression type descriptor is defined as any recognizable data token or descriptor that indicates which data encoding technique has been applied to the data. It is to be understood that, since encoders of the identical type may be applied in parallel to enhance encoding speed (as discussed above), the data compression type descriptor identifies the corresponding encoding technique applied to the encoded data block, not necessarily the specific encoder. The encoded data block having the greatest compression ratio along with its corresponding data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 1626).

As previously stated the data block stored in the buffer 20 (step 1604) is analyzed on a per block or multi-block basis by the content dependent data recognition module 1300 (step 1606). If the data stream content is recognized utilizing the recognition list(s) or algorithms(s) module 1310 (step 1634) the appropriate content dependent algorithms are enabled and initialized (step 1636) and the data is routed to the content dependent encoder module 1620 and compressed by each (enabled) encoder D1 . . . Dm (step 1638). Upon completion of the encoding of the input data block, an encoded data block is output from each (enabled) encoder D1 . . . Dm and maintained in a corresponding buffer (step 1640), and the encoded data block size is counted (step 1642).

Next, a compression ratio is calculated for each encoded data block by taking the ratio of the size of the input data block (as determined by the input counter 10 to the size of each encoded data block output from the enabled encoders (step 1644). Each compression ratio is then compared with an a priori-specified compression ratio threshold (step 1648). It is to be understood that the threshold limit may be specified as any value inclusive of data expansion, no data compression or expansion, or any arbitrarily desired compression limit. It is to be further understood that many of these algorithms may be lossy, and as such the limits may be subject to or modified by an end target storage, listening, or viewing device. Further notwithstanding that the current limit for lossless data compression is the entropy limit (the present definition of information content) for the data, the present invention does not preclude the use of future developments in lossless data compression that may increase lossless data compression ratios beyond what is currently known within the art. Additionally the content independent data compression threshold may be different from the content dependent threshold and either may be modified by the specific enabled encoders.

After the compression ratios are compared with the threshold, a determination is made as to whether the compression ratio of at least one of the encoded data blocks exceeds the threshold limit (step 1648). If there are no encoded data blocks having a compression ratio that exceeds the compression ratio threshold limit (negative determination in step 1620), then the original unencoded input data block is routed to the content independent encoder module 30 and the process resumes with compression utilizing content independent encoders (step 1610).

After the encoded data block or the unencoded data input data block is output (steps 1626 and 1636), a determination is made as to whether the input data stream contains additional data blocks to be processed (step 1628). If the input data stream includes additional data blocks (affirmative result in step 1628), the next successive data block is received (step 1632), its block size is counted (return to step 1602) and the data compression process in repeated. This process is iterated for each data block in the input data stream. Once the final input data block is processed (negative result in step 1628), data compression of the input data stream is finished (step 1630).

FIGS. 17a and 17b are block diagrams illustrating a data compression system employing both content independent and content dependent data compression according to another embodiment of the present invention. The system in FIGS. 17a and 17b is similar in operation to the system of FIGS. 13a and 13b in that content independent data compression is applied to a data block when the content of the data block cannot be identified or is not associable with a specific data compression algorithm. The system of FIGS. 17a and 17b additionally uses a priori estimation algorithms or look-up tables to estimate the desirability of using content independent data compression encoders and/or content dependent data compression encoders and selecting appropriate algorithms or subsets thereof based on such estimation.

More specifically, a content dependent data recognition and or estimation module 1700 is utilized to analyze the incoming data stream for recognition of data types, data strictures, data block formats, file substructures, file types, or any other parameters that may be indicative of the appropriate data compression algorithm or algorithms (in serial or in parallel) to be applied. Optionally, a data file recognition list(s) or algorithm(s) 1710 module may be employed to hold associations between recognized data parameters and appropriate algorithms. If the content data compression module recognizes a portion of the data, that portion is routed to the content dependent encoder module 1320, if not the data is routed to the content independent encoder module 30. It is to be appreciated that process of recognition (modules 1700 and 1710) is not limited to a deterministic recognition, but may further comprise a probabilistic estimation of which encoders to select for compression from the set of encoders of the content dependent module 1320 or the content independent module 30. For example, a method may be employed to compute statistics of a data block whereby a determination that the locality of repetition of characters in a data stream is determined is high can suggest a text document, which may be beneficially compressed with a lossless dictionary type algorithm. Further the statistics of repeated characters and relative frequencies may suggest a specific type of dictionary algorithm. Long strings will require a wide dictionary file while a wide diversity of strings may suggest a deep dictionary. Statistics may also be utilized in algorithms such as Huffman where various character statistics will dictate the choice of different Huffinan compression tables. This technique is not limited to lossless algorithms but may be widely employed with lossy algorithms. Header information in frames for video files can imply a specific data resolution. The estimator then may select the appropriate lossy compression algorithm and compression parameters (amount of resolution desired). As shown in previous embodiments of the present invention, desirability of various algorithms and now associated resolutions with lossy type algorithms may also be applied in the estimation selection process.

A mode of operation of the data compression system of FIGS. 17a and 17b will now be discussed with reference to the flow diagrams of FIGS. 18a-18d. The method of FIGS. 18a-18d use a priori estimation algorithms or look-up tables to estimate the desirability or probability of using content independent data compression encoders or content dependent data compression encoders, and select appropriate or desirable algorithms or subsets thereof based on such estimates. A data stream comprising one or more data blocks is input into the data compression system and the first data block in the stream is received (step 1800). As stated above, data compression is performed on a per data block basis. As previously stated a data block may represent any quantity of data from a single bit through a multiplicity of files or packets and may vary from block to block. Accordingly, the first input data block in the input data stream is input into the counter module 10 that counts the size of the data block (step 1802). The data block is then stored in the buffer 20 (step 1804). The data block is then analyzed on a per block or multi-block basis by the content dependent/content independent data recognition module 1700 (step 1806). If the data stream content is not recognized utilizing the recognition list(s) or algorithms(s) module 1710 (step 1808) the data is to the content independent encoder module 30. An estimate of the best content independent encoders is performed (step 1850) and the appropriate encoders are enabled and initialized as applicable. The data is then compressed by each (enabled) encoder E1 . . . En (step 1810). Upon completion of the encoding of the input data block, an encoded data block is output from each (enabled) encoder E1 . . . En and maintained in a corresponding buffer (step 1812), and the encoded data block size is counted (step 1814).

Next, a compression ratio is calculated for each encoded data block by taking the ratio of the size of the input data block (as determined by the input counter 10 to the size of each encoded data block output from the enabled encoders (step 1816). Each compression ratio is then compared with an a priori-specified compression ratio threshold (step 1818). It is to be understood that the threshold limit may be specified as any value inclusive of data expansion, no data compression or expansion, or any arbitrarily desired compression limit. It is to be further understood that notwithstanding that the current limit for lossless data compression is the entropy limit (the present definition of information content) for the data, the present invention does not preclude the use of future developments in lossless data compression that may increase lossless data compression ratios beyond what is currently known within the art. Additionally the content independent data compression threshold may be different from the content dependent threshold and either may be modified by the specific enabled encoders.

After the compression ratios are compared with the threshold, a determination is made as to whether the compression ratio of at least one of the encoded data blocks exceeds the threshold limit (step 1820). If there are no encoded data blocks having a compression ratio that exceeds the compression ratio threshold limit (negative determination in step 1820), then the original unencoded input data block is selected for output and a null data compression type descriptor is appended thereto (step 1834). A null data compression type descriptor is defined as any recognizable data token or descriptor that indicates no data encoding has been applied to the input data block. Accordingly, the unencoded input data block with its corresponding null data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 1836).

On the other hand, if one or more of the encoded data blocks possess a compression ratio greater than the compression ratio threshold limit (affirmative result in step 1820), then the encoded data block having the greatest compression ratio is selected (step 1822). An appropriate data compression type descriptor is then appended (step 1824). A data compression type descriptor is defined as any recognizable data token or descriptor that indicates which data encoding technique has been applied to the data. It is to be understood that, since encoders of the identical type may be applied in parallel to enhance encoding speed (as discussed above), the data compression type descriptor identifies the corresponding encoding technique applied to the encoded data block, not necessarily the specific encoder. The encoded data block having the greatest compression ratio along with its corresponding data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 1826).

As previously stated the data block stored in the buffer 20 (step 1804) is analyzed on a per block or multi-block basis by the content dependent data recognition module 1300 (step 1806). If the data stream content is recognized or estimated utilizing the recognition list(s) or algorithms(s) module 1710 (affirmative result in step 1808) the recognized data type/file or block is selected based on a list or algorithm (step 1838) and an estimate of the desirability of using the associated content dependent algorithms can be determined (step 1840). For instance, even though a recognized data type may be associated with three different encoders, an estimation of the desirability of using each encoder may result in only one or two of the encoders being actually selected for use. The data is routed to the content dependent encoder module 1320 and compressed by each (enabled) encoder D1 . . . Dm (step 1842). Upon completion of the encoding of the input data block, an encoded data block is output from each (enabled) encoder D1 . . . Dm and maintained in a corresponding buffer (step 1844), and the encoded data block size is counted (step 1846).

Next, a compression ratio is calculated for each encoded data block by taking the ratio of the size of the input data block (as determined by the input counter 10 to the size of each encoded data block output from the enabled encoders (step 1848). Each compression ratio is then compared with an a priori-specified compression ratio threshold (step 1850). It is to be understood that the threshold limit may be specified as any value inclusive of data expansion, no data compression or expansion, or any arbitrarily desired compression limit. It is to be further understood that many of these algorithms may be lossy, and as such the limits may be subject to or modified by an end target storage, listening, or viewing device. Further notwithstanding that the current limit for lossless data compression is the entropy limit (the present definition of information content) for the data, the present invention does not preclude the use of future developments in lossless data compression that may increase lossless data compression ratios beyond what is currently known within the art. Additionally the content independent data compression threshold may be different from the content dependent threshold and either may be modified by the specific enabled encoders.

After the compression ratios are compared with the threshold, a determination is made as to whether the compression ratio of at least one of the encoded data blocks exceeds the threshold limit (step 1820). If there are no encoded data blocks having a compression ratio that exceeds the compression ratio threshold limit (negative determination in step 1820), then the original unencoded input data block is selected for output and a null data compression type descriptor is appended thereto (step 1834). A null data compression type descriptor is defined as any recognizable data token or descriptor that indicates no data encoding has been applied to the input data block. Accordingly, the unencoded input data block with its corresponding null data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 1836).

On the other hand, if one or more of the encoded data blocks possess a compression ratio greater than the compression ratio threshold limit (affirmative result in step 1820), then the encoded data block having the greatest compression ratio is selected (step 1822). An appropriate data compression type descriptor is then appended (step 1824). A data compression type descriptor is defined as any recognizable data token or descriptor that indicates which data encoding technique has been applied to the data. It is to be understood that, since encoders of the identical type may be applied in parallel to enhance encoding speed (as discussed above), the data compression type descriptor identifies the corresponding encoding technique applied to the encoded data block, not necessarily the specific encoder. The encoded data block having the greatest compression ratio along with its corresponding data compression type descriptor is then output for subsequent data processing, storage, or transmittal (step 1826).

After the encoded data block or the unencoded data input data block is output (steps 1826 and 1836), a determination is made as to whether the input data stream contains additional data blocks to be processed (step 1828). If the input data stream includes additional data blocks (affirmative result in step 1428), the next successive data block is received (step 1832), its block size is counted (return to step 1802) and the data compression process in repeated. This process is iterated for each data block in the input data stream. Once the final input data block is processed (negative result in step 1828), data compression of the input data stream is finished (step 1830).

It is to be appreciated that in the embodiments described above with reference to FIGS. 13-18, an a priori specified time limit or any other real-time requirement may be employed to achieve practical and efficient real-time operation.

Although illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those precise embodiments, and that various other changes and modifications may be affected therein by one skilled in the art without departing from the scope or spirit of the invention. All such changes and modifications are intended to be included within the scope of the invention as defined by the appended claims.

Fallon, James J.

Patent Priority Assignee Title
Patent Priority Assignee Title
3394352,
3490690,
4021782, Aug 15 1972 Microsoft Corporation Data compaction system and apparatus
4032893, Jan 23 1976 Sperry Rand Corporation Reconfigurable data bus
4054951, Jun 30 1976 International Business Machines Corporation Data expansion apparatus
4127518, Jun 16 1977 VETERANS ADMINISTRATION, THE UNITED STATES OF AMERICA AS REPRESENTED BY Novel derivatives of gamma-endorphins, intermediates therefor, and compositions and methods employing said derivatives
4302775, Dec 15 1978 MAGNITUDE COMPRESSION SYSTEMS, INC Digital video compression system and methods utilizing scene adaptive coding with rate buffer feedback
4325085, Jun 09 1980 Hughes Electronics Corporation Method and apparatus for adaptive facsimile compression using a two dimensional maximum likelihood predictor
4360840, May 13 1980 ECRM Trust Real time data compression/decompression scheme for facsimile transmission system
4386416, Jun 02 1980 SGS-Thomson Microelectronics, Inc Data compression, encryption, and in-line transmission system
4394774, Dec 15 1978 MAGNITUDE COMPRESSION SYSTEMS, INC Digital video compression system and methods utilizing scene adaptive coding with rate buffer feedback
4464650, Aug 10 1981 BELL TELEPHONE LABORATORIES, INCORPORATED, A CORP OF NY ; AMERICAN TELEPHONE AND TELEGRAPH COMPANY, A CORP OF NY Apparatus and method for compressing data signals and restoring the compressed data signals
4494108, Nov 09 1981 International Business Machines Corporation Adaptive source modeling for data file compression within bounded memory
4499499, Dec 29 1982 International Business Machines Corporation Method for identification and compression of facsimile symbols in text processing systems
4574351, Mar 03 1983 International Business Machines Corporation Apparatus for compressing and buffering data
4593324, Apr 14 1981 Fuji Xerox Co., Ltd. Image data storing device
4626829, Aug 19 1985 INTELLISTOR, INC Data compression using run length encoding and statistical encoding
4646061, Mar 13 1985 RACAL-DATACOM, INC Data communication with modified Huffman coding
4682150, Dec 09 1985 TELEDATA SOUND LLC Data compression method and apparatus
4701745, Mar 06 1985 HI FN, INC Data compression system
4729020, Jun 01 1987 DELTA INFORMATION SYSTEMS, HORSHAM, PENNSYLVANIA, A CORP OF PA System for formatting digital signals to be transmitted
4730348, Sep 19 1986 Adaptive Computer Technologies Adaptive data compression system
4745559, Dec 27 1985 Reuters Limited Method and system for dynamically controlling the content of a local receiver data base from a transmitted data base in an information retrieval communication network
4748638, Oct 30 1985 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Data telecommunications system and method for transmitting compressed data
4750135, May 01 1986 Reuters Limited Method for dynamically creating a receiver definable local trading instrument displayable record from a remotely transmitted trading instrument common data stream
4754351, Aug 22 1984 CIT GROUP BUSINESS CREDIT, INC Method and apparatus for controlling radial disk displacement in Winchester disk drives
4804959, Nov 10 1987 International Business Machines Corporation Method and apparatus using multiple codes to increase storage capacity
4813040, Oct 31 1986 Method and apparatus for transmitting digital data and real-time digitalized voice information over a communications channel
4814746, Jun 01 1983 International Business Machines Corporation Data compression method
4862167, Feb 24 1987 TELOGY NETWORKS, INC Adaptive data compression method and apparatus
4866601, Sep 24 1987 TAIWAN SEMICONDUCTOR MANUFACTURING CO , LTD Digital data bus architecture for computer disk drive controller
4870415, Oct 19 1987 Hewlett-Packard Company Data compression system with expansion protection
4872009, Dec 12 1986 Hitachi, Ltd.; Hitachi Computer Peripherals Co. Method and apparatus for data compression and restoration
4876541, Oct 15 1987 STORER, JAMES A Stem for dynamically compressing and decompressing electronic data
4888812, Dec 18 1987 INTERNATIONAL BUSINESS MACHINES CORPORATION, A CORP OF NY Document image processing system
4890282, Mar 08 1988 NETWORK EQUIPMENT TECHNOLOGIES, INC , A DE CORP Mixed mode compression for data transmission
4897717, Mar 30 1988 StarSignal, Inc. Computer-based video compression system
4906991, Apr 29 1988 Xerox Corporation Textual substitution data compression with finite length search windows
4906995, Dec 12 1986 Sangamo Weston, Inc. Data compression apparatus and method for data recorder
4929946, Feb 09 1989 Storage Technology Corporation Adaptive data compression apparatus including run length encoding for a tape drive system
4953324, Dec 07 1987 Nova-Tech Engineering, Inc. Personnel door for a RF shielded room
4956808, Jan 07 1985 International Business Machines Corporation Real time data transformation and transmission overlapping device
4965675, May 15 1987 Canon Kabushiki Kaisha Method and apparatus for after-recording sound on a medium having pre-recorded video thereon
4988998, Sep 05 1989 Storage Technology Corporation Data compression system for successively applying at least two data compression methods to an input data stream
5003307, Jan 13 1989 HI FN, INC Data compression apparatus with shift register search means
5016009, Jan 13 1989 HI FN, INC Data compression apparatus and method
5027376, Oct 30 1985 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Data telecommunications system and method for transmitting compressed data
5028922, Oct 30 1989 Industrial Technology Research Institute Multiplexed encoder and decoder with address mark generation/check and precompensation circuits
5045848, Apr 10 1984 Data Broadcasting Corporation Method of encoding market data and transmitting by radio to a plurality of receivers
5045852, Mar 30 1990 International Business Machines Corporation Dynamic model selection during data compression
5046027, Nov 08 1988 Massachusetts General Hospital Apparatus and method for processing and displaying images in a digital procesor based system
5049881, Jun 18 1990 Intersecting Concepts, Inc. Apparatus and method for very high data rate-compression incorporating lossless data compression and expansion utilizing a hashing technique
5079630, Oct 05 1987 Intel Corporation Adaptive video compression system
5091782, Apr 09 1990 CIF LICENSING, LLC Apparatus and method for adaptively compressing successive blocks of digital video
5097261, Nov 22 1989 International Business Machines Corporation Data compression for recording on a record medium
5103306, Mar 28 1990 CAREFUSION 303, INC Digital image compression employing a resolution gradient
5109226, Nov 22 1989 International Business Machines Corporation Parallel processors sequentially encoding/decoding compaction maintaining format compatibility
5109433, Oct 13 1989 Microsoft Technology Licensing, LLC Compressing and decompressing text files
5109451, Apr 28 1988 Sharp Kabushiki Kaisha Orthogonal transform coding system for image data
5113522, May 17 1989 International Business Machines Corporation Data processing system with system resource management for itself and for an associated alien processor
5115309, Sep 10 1990 AT&T Bell Laboratories Method and apparatus for dynamic channel bandwidth allocation among multiple parallel video coders
5121342, Aug 28 1989 Network Communications Corporation Apparatus for analyzing communication networks
5126739, Jan 13 1989 HI FN, INC Data compression apparatus and method
5128963, Jan 31 1985 Sony Corporation 3-mode PCM/DPCM/APCM maximizing dynamic range
5132992, Jan 07 1991 Greenwich Information Technologies, LLC Audio and video transmission and receiving system
5146221, Jan 13 1989 HI FN, INC Data compression apparatus and method
5150430, Mar 15 1991 The Board of Trustees of the Leland Stanford Junior University Lossless data compression circuit and method
5155484, Sep 13 1991 FIFTH GENERATION SYSTEMS, INC ; Symantec Corporation Fast data compressor with direct lookup table indexing into history buffer
5159336, Aug 13 1991 DITTO, INC Tape controller with data compression and error correction sharing a common buffer
5167034, Jun 18 1990 International Business Machines Corporation Data integrity for compaction devices
5175543, Sep 25 1991 Hewlett-Packard Company Dictionary reset performance enhancement for data compression applications
5179651, Nov 08 1988 Massachusetts General Hospital Apparatus for retrieval and processing of selected archived images for display at workstation terminals
5187793, Jan 09 1989 Intel Corporation Processor with hierarchal memory and using meta-instructions for software control of loading, unloading and execution of machine instructions stored in the cache
5191431, Aug 29 1989 Canon Kabushiki Kaisha Recording apparatus having plural operating modes involving diverse signal compression rates and different apportioning of pilot signal recording area
5204756, Aug 04 1989 IPG HEALTHCARE 501 LIMITED Method for high-quality compression of binary text images
5209220, Oct 05 1989 Olympus Optical Co., Ltd. Endoscope image data compressing apparatus
5212742, May 24 1991 Apple Inc Method and apparatus for encoding/decoding image data
5226176, Aug 20 1990 Microsystems, Inc. System for selectively aborting operation or waiting to load required data based upon user response to non-availability of network load device
5227893, Oct 31 1990 International Business Machines Corporation; INTERNATIONAL BUSINESS MACHINES CORPORATION, A CORP OF NEW YORK Pseudo-bar code control of image transmission
5231492, Mar 16 1989 Fujitsu Limited Video and audio multiplex transmission system
5237460, Dec 14 1990 DIGITAL DATA FUNDING LLC Storage of compressed data on random access storage devices
5237675, Jun 04 1990 MAXTOR CORP Apparatus and method for efficient organization of compressed data on a hard disk utilizing an estimated compression factor
5243341, Jun 01 1992 Hewlett-Packard Company Lempel-Ziv compression scheme with enhanced adapation
5243348, Apr 27 1992 Freescale Semiconductor, Inc Partitioned digital encoder and method for encoding bit groups in parallel
5247638, Jun 18 1990 Storage Technology Corporation Apparatus for compressing data in a dynamically mapped virtual data storage subsystem
5247646, May 15 1986 COMPUTER UPGRADE CORPORATION Compressed data optical disk storage system
5249053, Feb 05 1991 DYCAM INC Filmless digital camera with selective image compression
5263168, Jun 03 1991 Freescale Semiconductor, Inc Circuitry for automatically entering and terminating an initialization mode in a data processing system in response to a control signal
5267333, Feb 28 1989 Sharp Kabushiki Kaisha Image compressing apparatus and image coding synthesizing method
5270832, Mar 14 1990 LSI Logic Corporation System for compression and decompression of video data using discrete cosine transform and coding techniques
5280600, Jan 19 1990 Hewlett-Packard Company Storage of compressed data with algorithm
5287420, Apr 08 1992 AUTODESK, Inc Method for image compression on a personal computer
5289580, May 10 1991 Unisys Corporation Programmable multiple I/O interface controller
5293379, Apr 22 1991 Mitel Corporation Packet-based data compression method
5293576, Nov 21 1991 CDC PROPRIETE INTELLECTUELLE Command authentication process
5307497, Jun 25 1990 LENOVO SINGAPORE PTE LTD Disk operating system loadable from read only memory using installable file system interface
5309555, May 15 1990 International Business Machines Corporation Realtime communication of hand drawn images in a multiprogramming window environment
5319682, Dec 08 1990 Cray Communications Limited Adaptive data compression system
5331425, Jan 14 1991 PANASONIC COMMUNICATIONS CO , LTD Image data encoding apparatus providing increased encoding efficiency with reduced dependency on image content
5341440, Jul 12 1991 Method and apparatus for increasing information compressibility
5347600, Jul 05 1989 MEDIABIN, INC Method and apparatus for compression and decompression of digital image data
5353132, Feb 06 1989 Canon Kabushiki Kaisha Image processing device
5354315, Jun 04 1993 Intermedics, Inc.; INTERMEDICS, INC Cardiac stimulator with data converter for cardiac signal
5355498, Feb 25 1992 Sun Microsystems, Inc. Method and apparatus for booting a computer system without loading a device driver into memory
5357614, Sep 17 1992 TECMAR TECHNOLOGIES, INC Data compression controller
5367629, Dec 18 1992 SHAREVISION TECHNOLOGY, INC , A CORPORATION OF CA Digital video compression system utilizing vector adaptive transform
5373290, Sep 25 1991 Hewlett-Packard Company Apparatus and method for managing multiple dictionaries in content addressable memory based data compression
5374916, Dec 18 1992 Apple Inc Automatic electronic data type identification process
5379036, Apr 01 1992 Method and apparatus for data compression
5379757, Aug 28 1990 Olympus Optical Co. Ltd. Method of compressing endoscope image data based on image characteristics
5381145, Feb 10 1993 Ricoh Company, LTD Method and apparatus for parallel decoding and encoding of data
5389922, Apr 13 1993 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Compression using small dictionaries with applications to network packets
5394534, Sep 11 1992 MEDIATEK INC Data compression/decompression and storage of compressed and uncompressed data on a same removable data storage medium
5396228, Jan 16 1992 SKYTEL CORP Methods and apparatus for compressing and decompressing paging data
5400401, Oct 30 1992 TECH 5 SAS System and method for transmitting a plurality of digital services
5403639, Sep 02 1992 Storage Technology Corporation File server having snapshot application data groups
5406278, Feb 28 1992 INTERSECTING CONCEPTS, INC Method and apparatus for data compression having an improved matching algorithm which utilizes a parallel hashing technique
5406279, Sep 02 1992 Cirrus Logic, INC General purpose, hash-based technique for single-pass lossless data compression
5410671, May 01 1990 VIA-Cyrix, Inc Data compression/decompression processor
5412384, Apr 16 1993 International Business Machines Corporation Method and system for adaptively building a static Ziv-Lempel dictionary for database compression
5414850, Aug 23 1991 HI FN, INC System for transparently compressing data files in a computer system
5420639, Apr 01 1993 Cisco Technology, Inc Rate adaptive huffman coding
5434983, Aug 30 1991 Matsushita Graphic Communication Systems Data processing apparatus having first bus with bus arbitration independent of CPU, second bus for CPU, and gate between first and second buses
5437020, Oct 03 1992 Intel Corporation Method and circuitry for detecting lost sectors of data in a solid state memory disk
5452287, Sep 20 1993 Motorola Mobility LLC Method of negotiation of protocols, classes, and options in computer and communication networks providing mixed packet, frame, cell, and circuit services
5454079, Sep 28 1993 IBM Corporation Computer workstation
5454107, Nov 30 1993 Mosaid Technologies Incorporated Cache memory support in an integrated memory system
5455576, Dec 23 1992 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Apparatus and methods for Lempel Ziv data compression with improved management of multiple dictionaries in content addressable memory
5455578, Jun 24 1992 Sony United Kingdom Limited Serial data decoding using state machine with selectable decoding tables
5455680, Jan 30 1993 Samsung Electronics Co., Ltd. Apparatus for compressing and decompressing image data
5461679, May 24 1991 Apple Inc Method and apparatus for encoding/decoding image data
5463390, Jan 13 1989 HI FN, INC Data compression apparatus and method
5467087, Dec 18 1992 Apple Inc High speed lossless data compression system
5471206, Feb 10 1993 Ricoh Company Ltd Method and apparatus for parallel decoding and encoding of data
5475388, Aug 17 1992 Ricoh Company Ltd. Method and apparatus for using finite state machines to perform channel modulation and error correction and entropy coding
5479587, Sep 03 1992 Hewlett-Packard Company Page printer having adaptive data compression for memory minimization
5479633, Oct 30 1992 Intel Corporation Method of controlling clean-up of a solid state memory disk storing floating sector data
5483470, Mar 06 1990 Alcatel Lucent Timing verification by successive approximation
5486826, May 19 1994 USATALKS COM, INC Method and apparatus for iterative compression of digital data
5488364, Feb 28 1994 Sam H., Eulmi; EULMI, SAM H Recursive data compression
5488365, Mar 01 1994 Hewlett-Packard Company Method and apparatus for compressing and decompressing short blocks of data
5495244, Dec 07 1991 Samsung Electronics Co., Ltd. Device for encoding and decoding transmission signals through adaptive selection of transforming methods
5504842, Nov 10 1992 Adobe Systems, Inc. Method and apparatus for processing data for a visual-output device with reduced buffer memory requirements
5506844, May 20 1994 Google Technology Holdings LLC Method for configuring a statistical multiplexer to dynamically allocate communication channel bandwidth
5506872, Apr 26 1994 AVAYA Inc Dynamic compression-rate selection arrangement
5506944, Nov 10 1992 Adobe Systems, Inc. Method and apparatus for processing data for a visual-output device with reduced buffer memory requirements
5521940, Feb 11 1992 Ouest Standard Telematique SA Method and device for the compression and decompression of data in a transmission system
5528628, Nov 26 1994 SAMSUNG ELECTRONICS CO , LTD Apparatus for variable-length coding and variable-length-decoding using a plurality of Huffman coding tables
5530845, May 13 1992 SBC Technology Resources, INC Storage control subsystem implemented with an application program on a computer
5533051, Mar 12 1993 HYPERSPACE COMMUNICATIONS, INC Method for data compression
5535311, Jul 28 1994 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Method and apparatus for image-type determination to enable choice of an optimum data compression procedure
5535356, Sep 09 1991 Samsung Electronics Co., Ltd. Digital data recording/playback system utilizing EEPROM and ROM memories as a storage medium
5535369, Oct 30 1992 Intel Corporation Method for allocating memory in a solid state memory disk
5537658, Jun 07 1995 HGST NETHERLANDS B V Distributed directory method and structure for direct access storage device (DASD) data compression
5539865, Nov 10 1992 Adobe Systems, Inc Method and apparatus for processing data for a visual-output device with reduced buffer memory requirements
5542031, Apr 30 1993 Halftone computer imager
5544290, Nov 10 1992 Adobe Systems, Inc. Method and apparatus for processing data for a visual-output device with reduced buffer memory requirements
5546395, Jul 07 1994 MULTI-TECH SYSTEMS, INC Dynamic selection of compression rate for a voice compression algorithm in a voice over data modem
5546475, Apr 29 1994 International Business Machines Corporation Produce recognition system
5553160, Sep 01 1994 Intel Corporation Method and apparatus for dynamically selecting an image compression process based on image size and color resolution
5557551, Oct 27 1993 International Business Machines Corporation Method and apparatus for a thermal protection unit
5557668, Jun 25 1992 TELEDATA SOLUTIONS, INC Call distribution system with distributed control of calls and data distribution
5557749, Oct 15 1992 Micron Technology, Inc System for automatically compressing and decompressing data for sender and receiver processes upon determination of a common compression/decompression method understood by both sender and receiver processes
5561421, Jul 28 1994 International Business Machines Corporation Access method data compression with system-built generic dictionaries
5561824, Oct 04 1994 International Business Machines Corporation Storage management of data for ensuring communication of minimal length data
5563961, Mar 03 1994 AUTODESK, Inc Video data compression method and system which measures compressed data storage time to optimize compression rate
5574952, May 11 1994 Western Digital Technologies, INC Data storage system and method for operating a disk controller including allocating disk space for compressed data
5574953, Aug 19 1994 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Storing compressed data in non-contiguous memory
5576953, Sep 07 1993 STUTMAN, PETER S Electronic translating device
5577248, Sep 13 1991 FIFTH GENERATION SYSTEMS, INC ; Symantec Corporation Method and apparatus for finding longest and closest matching string in history buffer prior to current string
5581715, Jun 22 1994 CSR TECHNOLOGY INC IDE/ATA CD drive controller having a digital signal processor interface, dynamic random access memory, data error detection and correction, and a host interface
5583500, Feb 10 1993 RICOH COMPANY, LTD A CORP OF JAPAN; RICOH CORPORATION A CORP OF DELAWARE Method and apparatus for parallel encoding and decoding of data
5586264, Sep 08 1994 International Business Machines Corporation Video optimized media streamer with cache management
5586285, Feb 19 1993 Intel Corporation Method and circuitry for increasing reserve memory in a solid state memory disk
5590306, Sep 08 1992 FUJIFILM Corporation Memory card management system for writing data with usage and recording codes made significant
5596674, Jun 24 1992 Sony Corporation; Sony United Kingdom Limited State machine apparatus and methods for encoding data in serial form and decoding using multiple tables
5598388, Jan 19 1990 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Storing plural data records on tape in an entity with an index entry common to those records
5604824, Sep 22 1994 FOTO-WEAR, INC Method and apparatus for compression and decompression of documents and the like using splines and spline-wavelets
5606706, Jul 09 1992 Hitachi, Ltd. Data storing system and data transfer method
5610657, Sep 14 1993 Envistech Inc. Video compression using an iterative error data coding method
5611024, Aug 28 1992 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Data compression of bit map images
5612788, Jul 30 1993 Sony Corporation; Sony United Kingdom Limited Video data compression apparatus for recording and reproducing compressed video data at their various compressed data rates
5613069, Dec 16 1994 Tony, Walker Non-blocking packet switching network with dynamic routing codes having incoming packets diverted and temporarily stored in processor inputs when network ouput is not available
5615017, Feb 21 1992 Samsung Electronics Co., Ltd. Method of and control circuit for compression recording and reproducing of multiple images
5615287, Dec 02 1994 Lawrence Livermore National Security LLC Image compression technique
5619995, Nov 12 1991 Motion video transformation system and method
5621820, Mar 03 1994 AUTODESK, Inc Video data compression method and system which measures compressed data storage time to optimize compression rate
5623623, Sep 09 1991 Samsung Electronics Co., Ltd. Digital storage system adopting semiconductor memory device
5623701, Jun 06 1995 Western Digital Technologies, INC Data compression method and structure for a direct access storage device
5627534, Mar 23 1995 PENDRAGON NETWORKS LLC Dual stage compression of bit mapped image data using refined run length and LZ compression
5627995, Dec 14 1990 DIGITAL DATA FUNDING LLC Data compression and decompression using memory spaces of more than one size
5629732, Mar 29 1994 The Trustees of Columbia University in the City of New York Viewer controllable on-demand multimedia service
5630092, Oct 20 1994 International Business Machines System and method for transferring compressed and uncompressed data between storage systems
5635632, Apr 26 1994 Cytec Technology Corp Settling process analysis device and method
5635932, Oct 17 1994 Fujitsu Limited Lempel-ziv compression with expulsion of dictionary buffer matches
5638498, Nov 10 1992 Adobe Systems, Inc Method and apparatus for reducing storage requirements for display data
5640158, Sep 14 1994 Seiko Epson Corporation Reversible method of encoding data
5642506, Dec 14 1994 International Business Machines Corporation Method and apparatus for initializing a multiprocessor system
5649032, Nov 14 1994 Sarnoff Corporation System for automatically aligning images to form a mosaic image
5652795, Nov 14 1994 U S BANK NATIONAL ASSOCIATION Method and apparatus for an adapter card providing conditional access in a communication system
5652857, Mar 09 1995 Fujitsu Limited Disk control apparatus for recording and reproducing compression data to physical device of direct access type
5652917, Nov 13 1992 Video Associates Labs, Inc. System for transmitting and receiving combination of compressed digital information and embedded strobe bit between computer and external device through parallel printer port of computer
5654703, Jun 17 1996 Hewlett Packard Enterprise Development LP Parallel data compression and decompression
5655138, Apr 11 1995 PDACO LTD Apparatus and method for peripheral device control with integrated data compression
5666560, Aug 03 1995 Western Digital Technologies, INC Storage method and hierarchical padding structure for direct access storage device (DASD) data compression
5668737, Mar 22 1995 CSR TECHNOLOGY INC High-speed data processor and coding method
5671355, Jun 26 1992 PREDACOMM, INC Reconfigurable network interface apparatus and method
5671389, Jan 11 1996 Quantum Corporation Adaptive compression caching for tape recording
5671413, Oct 31 1994 Intel Corporation Method and apparatus for providing basic input/output services in a computer
5673370, Jan 29 1993 Microsoft Technology Licensing, LLC Digital video data compression technique
5675333, Aug 31 1994 Pendragon Wireless LLC Digital compressed sound recorder
5675789, Oct 22 1992 NEC Corporation File compression processor monitoring current available capacity and threshold value
5686916, Dec 28 1995 U S PHILIPS CORPORATION Multi-code-book variable length decoder
5692159, May 19 1995 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Configurable digital signal interface using field programmable gate array to reformat data
5694619, Sep 20 1993 Fujitsu Limited System for exclusively controlling access of a semiconductor memory module using a backup memory and compression and decompression techniques
5696927, Dec 21 1995 GLOBALFOUNDRIES Inc Memory paging system and method including compressed page mapping hierarchy
5703793, Jul 29 1994 TALON RESEARCH, LLC Video decompression
5708511, Mar 24 1995 Harris Corporation Method for adaptively compressing residual digital image data in a DPCM compression system
5715477, Apr 11 1995 PDACO LTD Apparatus and method for peripheral device control with integrated data compression
5717393, Feb 08 1996 Fujitsu Limited Apparatus for data compression and data decompression
5717394, Feb 10 1993 Ricoh Corporation Method and apparatus for encoding and decoding data
5719862, May 14 1996 DIODES INCORPORATED Packet-based dynamic de-skewing for network switch with local or central clock
5721958, Apr 11 1995 PDACO LTD Apparatus and method for peripheral device control with integrated data compression
5724475, May 18 1995 Timepres Corporation Compressed digital video reload and playback system
5729228, Jul 06 1995 GLOBALFOUNDRIES Inc Parallel compression and decompression using a cooperative dictionary
5740395, Oct 30 1992 Intel Corporation Method and apparatus for cleaning up a solid state memory disk storing floating sector data
5742773, Apr 18 1996 Microsoft Technology Licensing, LLC Method and system for audio compression negotiation for multiple channels
5748122, Oct 17 1994 Fujitsu Limited Data processing apparatus and data processing method
5748904, Sep 13 1996 XGI TECHNOLOGY, INC Method and system for segment encoded graphic data compression
5757852, Jan 24 1997 WESTERNGECO, L L C Method for compression of high resolution seismic data
5764774, Sep 25 1995 Intermec IP CORP Source data compression and decompression in code symbol printing and decoding
5765027, Sep 26 1994 TOSHIBA AMERICA INFORMATION SYSTEMS, INC Network controller which enables the local processor to have greater access to at least one memory device than the host computer in response to a control signal
5767898, Jun 23 1994 Sanyo Electric Co., Ltd. Three-dimensional image coding by merger of left and right images
5768445, Sep 13 1996 SAMSUNG ELECTRONICS CO , LTD Compression and decompression scheme performed on shared workstation memory by media coprocessor
5768525, Sep 08 1995 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Transparent support of protocol and data compression features for data communication
5771340, Jan 14 1994 Oki Electric Industry Co., Ltd. Data compression method and print processing device utilizing the same
5774715, Mar 27 1996 Oracle America, Inc File system level compression using holes
5778411, May 16 1995 NetApp, Inc Method for virtual to physical mapping in a mapped compressed virtual storage subsystem
5781767, Dec 03 1993 Hitachi, Ltd. Package blocking method for a storage system having a bus common to a plurality of kinds of groups of packages
5784572, Dec 29 1995 AVAGO TECHNOLOGIES GENERAL IP SINGAPORE PTE LTD Method and apparatus for compressing video and voice signals according to different standards
5784631, Jun 30 1992 COASES INVESTMENTS BROS L L C Huffman decoder
5787487, Nov 30 1993 Fuji Xerox Co., Ltd. Information storage system for converting data at transfer
5794229, Apr 16 1993 SYBASE, INC Database system with methodology for storing a database table by vertically partitioning all columns of the table
5796864, May 12 1992 Apple Inc Method and apparatus for real-time lossless compression and decompression of image data
5799110, Nov 09 1995 Utah State University Foundation Hierarchical adaptive multistage vector quantization
5805834, Mar 30 1994 ACACIA PATENT ACQUISITION LLC Hot reconfigurable parallel bus bridging circuit
5805932, Apr 22 1994 Sony Corporation System for transmitting compressed data if compression ratio is at least preset ratio and pre-compressed data if compression ratio is less than preset ratio
5807036, Oct 04 1996 Adjustable drill jig
5808660, Sep 05 1995 Rockwell Collins, Inc Video on-demand system with a plurality of reception apparatus connected in a daisy chain connection
5809176, Oct 18 1994 Seiko Epson Corporation Image data encoder/decoder system which divides uncompresed image data into a plurality of streams and method thereof
5809299, Feb 17 1993 MORGAN SIGNALS LLC Method of and apparatus for reduction of bandwidth requirements in the provision of electronic information and transaction services through communication networks
5809337, Nov 10 1995 Intel Corporation Mass storage devices utilizing high speed serial communications
5812195, Sep 14 1993 Envistech, Inc. Video compression using an iterative correction data coding method and systems
5812789, Aug 26 1996 PARTHENON UNIFIED MEMORY ARCHITECTURE LLC Video and/or audio decompression and/or compression device that shares a memory interface
5812883, Nov 22 1995 MITSUBISHI CHEMICAL AMERICA, INC System for reading and storing formatting information after formatting a first storage medium and using the stored formatting information to format a second storage medium
5818368, Apr 18 1997 Premier Research, LLC Method and apparatus for lossless digital data compression
5818369, Mar 07 1996 Pegasus Imaging Corporation Rapid entropy coding for data compression or decompression
5818530, Jun 19 1996 Thomson Consumer Electronics, Inc MPEG compatible decoder including a dual stage data reduction network
5819215, Oct 13 1995 Hewlett Packard Enterprise Development LP Method and apparatus for wavelet based data compression having adaptive bit rate control for compression of digital audio or other sensory data
5822781, Oct 30 1992 Intel Corporation Sector-based storage device emulator having variable-sized sector
5825424, Jun 19 1996 Thomson Consumer Electronics, Inc MPEG system which decompresses and recompresses image data before storing image data in a memory and in accordance with a resolution of a display device
5825830, Aug 17 1995 Method and apparatus for the compression of audio, video or other data
5832037, Jun 23 1995 HANWHA TECHWIN CO , LTD Method of compressing and expanding data
5832126, Jul 07 1995 Oki Data Corporation Method and apparatus for compressing mixed text and image data
5832443, Feb 25 1997 XVD TECHNOLOGY HOLDINGS, LTD IRELAND Method and apparatus for adaptive audio compression and decompression
5835788, Sep 18 1996 Electronics For Imaging System for transferring input/output data independently through an input/output bus interface in response to programmable instructions stored in a program memory
5836003, Aug 26 1993 AMSTR INVESTMENTS 2 K G , LLC Methods and means for image and voice compression
5838821, Mar 14 1995 Ricoh Company, LTD Method and apparatus for selecting compression method and for compressing file using the selected method
5838927, Nov 22 1996 Microsoft Technology Licensing, LLC Method and apparatus for compressing a continuous, indistinct data stream
5838996, May 31 1994 International Business Machines Corporation; International Business Machines Corp System for determining presence of hardware decompression, selectively enabling hardware-based and software-based decompression, and conditioning the hardware when hardware decompression is available
5839100, Apr 22 1996 ALTERA CORPORATOPM Lossless and loss-limited compression of sampled data signals
5841979, May 25 1995 IRONWORKS PATENTS LLC Enhanced delivery of audio data
5847762, Dec 27 1995 Thomson Consumer Electronics, Inc MPEG system which decompresses and then recompresses MPEG video data before storing said recompressed MPEG video data into memory
5850565, Aug 26 1996 JPMORGAN CHASE BANK, N A , AS SUCCESSOR AGENT Data compression method and apparatus
5856797, Jan 26 1995 Sega Enterprises Ltd. Data encoding device, data decoding device, data encoding method and data decoding method
5861824, Jun 20 1995 FORENSIC SCIENCE SERVICE LTD Encoding method and system, and decoding method and system
5861920, Nov 08 1996 Hughes Electronics Corporation Hierarchical low latency video compression
5864342, Aug 04 1995 Microsoft Technology Licensing, LLC Method and system for rendering graphical objects to image chunks
5864678, May 08 1996 Apple Inc System for detecting and reporting data flow imbalance between computers using grab rate outflow rate arrival rate and play rate
5867167, Aug 04 1995 Sun Microsystems, Inc. Compression of three-dimensional graphics data including quantization, delta-encoding, and variable-length encoding
5867602, Sep 21 1994 RICOH COMPANY, LTD , A CORPORATION OF JAPAN Reversible wavelet transform and embedded codestream manipulation
5870036, Feb 24 1995 International Business Machines Corporation Adaptive multiple dictionary data compression
5870087, Nov 13 1996 AVAGO TECHNOLOGIES GENERAL IP SINGAPORE PTE LTD MPEG decoder system and method having a unified memory for transport decode and system controller functions
5872530, Jan 31 1996 Hitachi, Ltd. Method of and apparatus for compressing and decompressing data and data processing apparatus and network system using the same
5874907, Sep 19 1997 International Business Machines Corporation Method and apparatus for providing improved data compression efficiency for an adaptive data compressor
5881104, Mar 25 1996 Sony Corporation; Sony Electronics INC Voice messaging system having user-selectable data compression modes
5883975, Sep 12 1994 Nippon Steel Corporation Compression and decompression methods on two-dimensional image data
5884269, Apr 17 1995 Merging Technologies Lossless compression/decompression of digital audio data
5886655, Apr 09 1997 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Arithmetic coding context model that accelerates adaptation for small amounts of data
5887165, Jun 20 1997 HANGER SOLUTIONS, LLC Dynamically reconfigurable hardware system for real-time control of processes
5889961, Jun 27 1996 Western Digital Technologies, INC Disk drive having program to be executed by a second processor stored in a first processor's ROM in a compressed form
5892847, Jul 14 1994 Citrix Systems, Inc Method and apparatus for compressing images
5901278, Aug 18 1994 Konica Corporation Image recording apparatus with a memory means to store image data
5907801, Sep 22 1995 Chanyu Holdings, LLC Apparatus and method for optimizing wireless financial transactions
5909557, Nov 20 1995 AVAGO TECHNOLOGIES GENERAL IP SINGAPORE PTE LTD Integrated circuit with programmable bus configuration
5909559, Apr 04 1997 Texas Instruments Incorporated Bus bridge device including data bus of first width for a first processor, memory controller, arbiter circuit and second processor having a different second data width
5915079, Jun 17 1997 Hewlett-Packard Company Multi-path data processing pipeline
5917438, Jun 30 1995 JVC Kenwood Corporation Data storing and outputting apparatus
5918068, Dec 23 1994 HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B V ; MARIANA HDD B V Reconfigurable interface for small disk drives
5918225, Apr 16 1993 SYBASE, INC SQL-based database system with improved indexing methodology
5920326, May 30 1997 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Caching and coherency control of multiple geometry accelerators in a computer graphics system
5923860, Jun 25 1997 Hewlett Packard Enterprise Development LP Apparatus, method and system for remote peripheral component interconnect bus using accelerated graphics port logic circuits
5930358, Nov 22 1995 MITSUBISHI KAGAKU MEDIA CO , LTD Storage device having a nonvolatile memory for storing user changeable operating parameters
5936616, Aug 07 1996 Microsoft Technology Licensing, LLC Method and system for accessing and displaying a compressed display image in a computer system
5938737, Feb 14 1997 RPX Corporation Internet upstream request compression
5943692, Apr 30 1997 International Business Machines Corp Mobile client computer system with flash memory management utilizing a virtual address map and variable length data
5945933, Jan 27 1998 RIVERBED TECHNOLOGY, INC Adaptive packet compression apparatus and method
5949355, Dec 06 1994 Cennoid Technologies, Inc. Method and apparatus for adaptive data compression
5949968, Nov 10 1992 Adobe Systems Incorporated Method and apparatus for processing data for a visual-output device with reduced buffer memory requirements
5951623, Aug 06 1996 Pinpoint Incorporated Lempel- Ziv data compression technique utilizing a dictionary pre-filled with frequent letter combinations, words and/or phrases
5955976, Dec 02 1997 Hughes Electronics Corporation Data compression for use with a communications channel
5956490, Jun 30 1998 Google Technology Holdings LLC Method, client device, server and computer readable medium for specifying and negotiating compression of uniform resource identifiers
5960465, Feb 27 1997 Oracle International Corporation Apparatus and method for directly accessing compressed data utilizing a compressed memory address translation unit and compression descriptor table
5964842, Jan 31 1997 Network Computing Devices, Inc.; NETWORK COMPUTING DEVICES, INC Method and apparatus for scaling data compression based on system capacity
5968149, Jan 07 1998 International Business Machines Corporation Tandem operation of input/output data compression modules
5969927, Oct 24 1996 Robert Bosch GmbH Integrated overload protective device
5973630, Dec 02 1997 Hughes Electronics Corporation Data compression for use with a communications channel
5974235, Oct 31 1996 SENSORMATIC ELECTRONICS, LLC Apparatus having flexible capabilities for analysis of video information
5974387, Jun 19 1996 Yamaha Corporation Audio recompression from higher rates for karaoke, video games, and other applications
5974471, Jul 19 1996 GLOBALFOUNDRIES Inc Computer system having distributed compression and decompression logic for compressed data movement
5978483, Apr 07 1997 Inkel Corporation Securely encrypted remote keyless entry system
5982360, Jun 08 1997 United Microelectronics Corp. Adaptive-selection method for memory access priority control in MPEG processor
5982723, Sep 30 1996 DISK AUTHORING TECHNOLOGIES, LLC Data recording and reproducing method for multi-layered optical disk system
5982937, Dec 24 1996 Electronics for Imaging, Inc. Apparatus and method for hybrid compression of raster data
5987022, Dec 27 1996 MOTOROLA SOLUTIONS, INC Method for transmitting multiple-protocol packetized data
5987432, Jun 29 1994 Reuters, Ltd. Fault-tolerant central ticker plant system for distributing financial market data
5987590, Mar 24 1997 Texas Instruments Incorporated PC circuits, systems and methods
5990884, May 02 1997 Sony Corporation; Sony Electronics, Inc. Control of multimedia information with interface specification stored on multimedia component
5991515, Nov 10 1992 Adobe Systems Incorporated Method and apparatus for compressing and decompressing data prior to display
5996033, Sep 04 1997 Data compression device comprising input connector for connecting to game player system, output connector for connecting to memory card, and virtual memory page switch
6000009, May 06 1997 Western Digital Technologies, INC Method and apparatus for allocation of disk memory space for compressed data records
6002411, Nov 16 1994 Intellectual Ventures I LLC Integrated video and memory controller with data processing and graphical processing capabilities
6003115, Jul 29 1997 POWER MANAGEMENT ENTERPRISES, LLC Method and apparatus for predictive loading of a cache
6008743, Nov 19 1997 UNILOC 2017 LLC Method and apparatus for switching between data compression modes
6009491, Jun 20 1996 Robert Bosch GmbH Data transmission method having a data line which is separate from a data bus and is designed as a chain
6011901, May 18 1995 Timepres Corporation Compressed digital video record and playback system
6014694, Jun 26 1997 Citrix Systems, Inc System for adaptive video/audio transport over a network
6021433, Jan 26 1996 SIMPLEAIR, INC System and method for transmission of data
6023755, Jul 29 1992 TAROFISS DATA LIMITED LIABILITY COMPANY Computer with programmable arrays which are reconfigurable in response to instructions to be executed
6026217, Jun 21 1996 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Method and apparatus for eliminating the transpose buffer during a decomposed forward or inverse 2-dimensional discrete cosine transform through operand decomposition storage and retrieval
6028725, Jun 30 1997 EMC IP HOLDING COMPANY LLC Method and apparatus for increasing disc drive performance
6031939, Mar 17 1997 Alcatel Method of optimizing the compression of image data, with automatic selection of compression conditions
6032148, Sep 15 1997 Hewlett Packard Enterprise Development LP Multilevel storage system with hybrid data compression
6032197, Sep 25 1997 Microsoft Technology Licensing, LLC Data packet header compression for unidirectional transmission
6038346, Jan 29 1998 Seiko Epson Corporation Runs of adaptive pixel patterns (RAPP) for lossless image compression
6057790, Feb 28 1997 Fujitsu Limited Apparatus and method for data compression/expansion using block-based coding with top flag
6058459, Aug 26 1996 PARTHENON UNIFIED MEMORY ARCHITECTURE LLC Video/audio decompression/compression device including an arbiter and method for accessing a shared memory
6061398, Mar 11 1996 Fujitsu Limited Method of and apparatus for compressing and restoring data
6061473, May 17 1996 Oki Data Corporation Compression and expansion methods and apparatus
6070179, Feb 20 1998 International Business Machines Corporation Method and system for compressing unicode data within a data processing system
6073232, Feb 25 1997 International Business Machines Corporation Method for minimizing a computer's initial program load time after a system reset or a power-on using non-volatile storage
6075470, Feb 26 1998 BlackBerry Limited Block-wise adaptive statistical data compressor
6078958, Jan 31 1997 Hughes Electronics Corporation System for allocating available bandwidth of a concentrated media output
6091777, Sep 18 1997 SYS TECHNOLOGIES Continuously adaptive digital video compression system and method for a web streamer
6092123, Jul 17 1997 International Business Machines Corporation Method and apparatus for changing functions of a hardware device using two or more communication channels
6094634, Mar 26 1997 Fujitsu Limited Data compressing apparatus, data decompressing apparatus, data compressing method, data decompressing method, and program recording medium
6097520, Jun 30 1997 Microsoft Technology Licensing, LLC Remote control receiver and method of operation
6097845, Oct 21 1997 Canon Kabushiki Kaisha Image discriminator
6098114, Nov 14 1997 Summit Data Systems LLC Disk array system for processing and tracking the completion of I/O requests
6104389, Oct 31 1997 JVC Kenwood Corporation Broadcast receiving method and broadcast receiving apparatus therefor
6105130, Dec 23 1997 PMC-SIERRA, INC Method for selectively booting from a desired peripheral device
6115384, Jun 20 1996 VENTURI WIRELESS, INC Gateway architecture for data communication bandwidth-constrained and charge-by-use networks
6128412, Sep 02 1996 Fujitsu Limited Statistical data compression/decompression method
6134631, Aug 19 1996 TAIWAN SEMICONDUCTOR MANUFACTURING CO , LTD Non-volatile memory with embedded programmable controller
6141053, Jan 03 1997 TERADATA US, INC Method of optimizing bandwidth for transmitting compressed video data streams
6145020, May 14 1998 Silicon Storage Technology, Inc Microcontroller incorporating an enhanced peripheral controller for automatic updating the configuration date of multiple peripherals by using a ferroelectric memory array
6145069, Jan 29 1999 Intellectual Ventures I LLC Parallel decompression and compression system and method for improving storage density and access speed for non-volatile memory and embedded memory devices
6169241, Mar 03 1997 Yamaha Corporation Sound source with free compression and expansion of voice independently of pitch
6170007, Oct 25 1996 Hewlett-Packard Company; HEWLETT-PACKARD DEVELOPMENT COMPANY, L P ; Agilent Technologies, Inc Embedding web access functionality into a device for user interface functions
6170047, Nov 16 1994 Intellectual Ventures I LLC System and method for managing system memory and/or non-volatile memory using a memory controller with integrated compression and decompression capabilities
6170049, Apr 02 1996 Texas Instruments Incorporated PC circuits, systems and methods
6172936, May 28 1998 SOCIONEXT INC Memory circuit
6173381, Nov 16 1994 Intellectual Ventures I LLC Memory controller including embedded data compression and decompression engines
6175650, Jan 26 1998 Xerox Corporation Adaptive quantization compatible with the JPEG baseline sequential mode
6175856, Sep 30 1996 Apple Inc Method and apparatus for dynamic selection of compression processing during teleconference call initiation
6182125, Oct 13 1998 Hewlett Packard Enterprise Development LP Methods for determining sendable information content based on a determined network latency
6185625, Dec 20 1996 Intel Corporation Scaling proxy server sending to the client a graphical user interface for establishing object encoding preferences after receiving the client's request for the object
6185659, Mar 23 1999 Storage Technology Corporation Adapting resource use to improve performance in a caching memory system
6192082, Nov 13 1998 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Digital television data format conversion with automatic parity detection
6192155, Sep 16 1998 Xerox Corporation Systems and methods for reducing boundary artifacts in hybrid compression
6195024, Dec 11 1998 Realtime Data LLC Content independent data compression method and system
6195125, Aug 11 1995 Canon Kabushiki Kaisha Pixel shifting image sensor with a different number of images sensed in each mode
6195391, May 31 1994 International Business Machines Corp Hybrid video compression/decompression system
6195465, Sep 20 1994 RICOH COMPANY, LTD , A CORP OF JAPAN Method and apparatus for compression using reversible wavelet transforms and an embedded codestream
6198842, Jun 19 1997 MEDIATEK INC Multi-spectral image compression with bounded loss
6198850, Jun 12 1998 Xerox Corporation System and method for segmentation dependent lossy and lossless compression for higher quality
6208273, Jan 29 1999 Intellectual Ventures I LLC System and method for performing scalable embedded parallel data compression
6215904, Nov 30 1994 Xerox Corporation Apparatus and method for selecting encoding schemes based upon image content
6216157, Nov 14 1997 R2 SOLUTIONS LLC Method and apparatus for a client-server system with heterogeneous clients
6219754, Jun 07 1995 Advanced Micro Devices Inc. Processor with decompressed video bus
6222886, Jun 24 1996 Kabushiki Kaisha Toshiba Compression based reduced memory video decoder
6225922, Mar 16 1998 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P System and method for compressing data using adaptive field encoding
6226667, May 26 1998 International Business Machines Corporation Method and apparatus for preloading data in a distributed data processing system
6226740, Dec 19 1997 HTC Corporation Information processing apparatus and method that uses first and second power supplies for reducing booting time
6230223, Jun 01 1998 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Dual purpose apparatus method and system for accelerated graphics or second memory interface
6237054, Sep 14 1998 GLOBALFOUNDRIES Inc Network interface unit including a microcontroller having multiple configurable logic blocks, with a test/program bus for performing a plurality of selected functions
6243829, May 27 1998 Hewlett Packard Enterprise Development LP Memory controller supporting redundant synchronous memories
6253264, Mar 07 1997 Viasat, Inc Coding network grouping data of same data type into blocks using file data structure and selecting compression for individual block base on block data type
6257693, Jan 27 1994 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Automatic optimization of hardcopy output
6272178, Apr 18 1996 NOKIA SOLUTIONS AND NETWORKS OY Video data encoder and decoder
6272627, Oct 30 1998 ATI Technologies ULC Method and apparatus for booting up a computing system with enhanced graphics
6272628, Dec 14 1998 Lenovo PC International Boot code verification and recovery
6282641, Nov 18 1998 KINGLITE HOLDINGS INC System for reconfiguring a boot device by swapping the logical device number of a user selected boot drive to a currently configured boot drive
6285458, Jul 31 1996 Fuji Xerox Co., Ltd. Image processing apparatus and method
6298408, Mar 03 1998 HANGER SOLUTIONS, LLC Intelligent input and output controller for flexible interface
6308311, May 14 1999 XILINX, Inc. Method for reconfiguring a field programmable gate array from a host
6309424, Dec 11 1998 Realtime Data LLC Content independent data compression method and system
6310563, May 12 2000 International Business Machines Corporation Method and apparatus for enhanced decompressor parsing
6317714, Feb 04 1997 MUSICQUBED INNOVATIONS, LLC Controller and associated mechanical characters operable for continuously performing received control data while engaging in bidirectional communications over a single communications channel
6317818, Mar 30 1999 Microsoft Technology Licensing, LLC Pre-fetching of pages prior to a hard page fault sequence
6330622, Oct 23 1998 Intel Corporation Direct processor access via an external multi-purpose interface
6333745, Sep 30 1996 Acacia Research Group LLC Data processor having unified memory architecture providing priority memory access
6336153, Feb 26 1998 Kabushiki Kaisha Toshiba High-speed hybernation
6345307, Apr 30 1999 Google Technology Holdings LLC Method and apparatus for compressing hypertext transfer protocol (HTTP) messages
6356589, Jan 28 1999 International Business Machines Corporation Sharing reference data between multiple encoders parallel encoding a sequence of video frames
6356937, Jul 06 1999 MEC MANAGEMENT, LLC Interoperable full-featured web-based and client-side e-mail system
6374353, Mar 16 1998 Mitsubishi Denki Kabushiki Kaisha Information processing apparatus method of booting information processing apparatus at a high speed
6388584, Mar 16 2000 Lucent Technologies Inc. Method and apparatus for data compression of network packets
6392567, Mar 31 2000 Fijitsu Limited Apparatus for repeatedly compressing a data string and a method thereof
6404931, Dec 14 1998 Microsoft Technology Licensing, LLC Code book construction for variable to variable length entropy encoding
6421387, May 15 1998 North Carolina State University Methods and systems for forward error correction based loss recovery for interactive video transmission
6434168, Jun 07 1996 Nokia Siemens Networks Oy Data compression on a data connection
6434695, Dec 23 1998 Apple Inc Computer operating system using compressed ROM image in RAM
6442659, Feb 17 1998 EMC IP HOLDING COMPANY LLC Raid-type storage system and technique
6449658, Nov 18 1999 QUIKCATAUSTRALIA PTY LTD Method and apparatus for accelerating data through communication networks
6449682, Jun 18 1999 PHOENIX TECHNOLOGIES LTD System and method for inserting one or more files onto mass storage
6452602, Dec 13 1999 ATI Technologies ULC Method and apparatus for storing compressed data
6452933, Feb 07 1997 Lucent Technologies Inc Fair queuing system with adaptive bandwidth redistribution
6459429, Jun 14 1999 Oracle America, Inc Segmenting compressed graphics data for parallel decompression and rendering
6463509, Jan 26 1999 Rovi Technologies Corporation Preloading data in a cache memory according to user-specified preload criteria
6487640, Jan 19 1999 International Business Machines Corporation Memory access request reordering to reduce memory access latency
6489902, Dec 02 1997 Hughes Electronics Corporation Data compression for use with a communications channel
6505239, Nov 14 1997 E-PARCEL CORPORATION System for minimizing screen refresh time using selectable compression speeds
6513113, Jun 19 1998 Ricoh Company, LTD Electronic instrument adapted to be selectively booted either from externally-connectable storage unit or from internal nonvolatile rewritable memory
6523102, Apr 14 2000 Intellectual Ventures I LLC PARALLEL COMPRESSION/DECOMPRESSION SYSTEM AND METHOD FOR IMPLEMENTATION OF IN-MEMORY COMPRESSED CACHE IMPROVING STORAGE DENSITY AND ACCESS SPEED FOR INDUSTRY STANDARD MEMORY SUBSYSTEMS AND IN-LINE MEMORY MODULES
6526174, May 19 1994 Apple Inc Method and apparatus for video compression using block and wavelet techniques
6529633, Sep 16 1998 Texas Instruments Incorporated Parallel difference coding method for lossless compression and real time decompression
6532121, Oct 25 1999 Hewlett Packard Enterprise Development LP Compression algorithm with embedded meta-data for partial record operation augmented with expansion joints
6539438, Jan 15 1999 Quickflex Inc. Reconfigurable computing system and method and apparatus employing same
6539456, Oct 13 1999 Intel Corporation Hardware acceleration of boot-up utilizing a non-volatile disk cache
6542644, Sep 02 1996 Fujitsu Limited Statistical data compression/decompression method
6577254, Nov 14 2001 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Data compression/decompression system
6590609, Feb 21 1997 MAXELL, LTD Image signal recording system
6597812, May 28 1999 Realtime Data, LLC System and method for lossless data compression and decompression
6601104, Mar 11 1999 Realtime Data LLC System and methods for accelerated data storage and retrieval
6604040, Dec 14 2000 Sumitomo Rubber Industries, Limited Apparatus and method for identifying tires and apparatus and method for evaluating road surface conditions
6604158, Mar 11 1999 Realtime Data, LLC System and methods for accelerated data storage and retrieval
6606040, Feb 13 2001 GOOGLE LLC Method and apparatus for adaptive data compression
6606413, Jun 01 1998 Carl Zeiss Microscopy GmbH Compression packaged image transmission for telemicroscopy
6609223, Apr 06 1999 KENCAST, INC METHOD FOR PACKET-LEVEL FEC ENCODING, IN WHICH ON A SOURCE PACKET-BY-SOURCE PACKET BASIS, THE ERROR CORRECTION CONTRIBUTIONS OF A SOURCE PACKET TO A PLURALITY OF WILDCARD PACKETS ARE COMPUTED, AND THE SOURCE PACKET IS TRANSMITTED THEREAFTER
6618728, Jan 31 1996 Hewlett Packard Enterprise Development LP Multi-process compression
6624761, Dec 11 1998 Realtime Data, LLC Content independent data compression method and system
6633244, Jan 03 2000 Efeckta Technologies Corporation Efficient and lossless conversion for transmission or storage of data
6633968, Mar 30 1999 Microsoft Technology Licensing, LLC Pre-fetching of pages prior to a hard page fault sequence
6650261, Sep 06 2001 Xerox Corporation Sliding window compression method utilizing defined match locations
6661839, Mar 24 1998 Advantest Corporation Method and device for compressing and expanding data pattern
6661845, Jan 14 1999 Vianix Delaware, LLC Data compression system and method
6704840,
6708220, Nov 19 1998 X NET ASSOCIATES, INC System and method for in-stream data compression
6711709, Jun 24 1998 Unisys Corporation Integrated block checking system for rapid file transfer of compressed data
6717534, Jan 18 2002 Fuji Xerox Co., Ltd. Data encoding device and data decoding device
6723225, Jul 31 2001 The United States of America as represented by the Secretary of the Navy; GOVERNMENT OF THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF THE NAVY, THE Automobile engine disabling device
6731814, May 01 2000 Xerox Corporation Method for compressing digital documents with control of image quality and compression rate
6735195, Dec 29 1999 RPX CLEARINGHOUSE LLC Apparatus and method of minimizing delay of transmissions over a network
6745282, Jan 13 1995 Fujitsu Limited Compressed data managing apparatus and method therefor to manage compressed data of a disk storage
6748457, Feb 03 2000 Realtime Data, LLC Data storewidth accelerator
6756922, May 21 2001 International Business Machines Corporation Method and system for compression of a set of mostly similar strings allowing fast retrieval
6768749, Oct 14 1999 Cisco Technology, Inc. Dual-channel communications protocol providing enhanced capabilities for modems
6792151, Nov 24 1999 General Electric Company Image data compression employing optimal subregion compression
6810434, Dec 29 1997 KAWASAKI MICROELECTRONICS, INC Multimedia interface having a processor and reconfigurable logic
6813689, Mar 29 2002 EMC IP HOLDING COMPANY LLC Communications architecture for a high throughput storage processor employing extensive I/O parallelization
6819271, Jan 29 1999 Intellectual Ventures I LLC Parallel compression and decompression system and method having multiple parallel compression and decompression engines
6822589, Jan 29 1999 Intellectual Ventures I LLC System and method for performing scalable embedded parallel data decompression
6856651, Jul 25 2000 RIVERBED TECHNOLOGY LLC System and method for incremental and continuous data compression
6862278, Jun 18 1998 Microsoft Technology Licensing, LLC System and method using a packetized encoded bitstream for parallel compression and decompression
6879266, Aug 08 1997 Intellectual Ventures I LLC Memory module including scalable embedded parallel data compression and decompression engines
6885316, Feb 05 2001 System and method for keyboard independent touch typing
6885319, Jan 29 1999 Intellectual Ventures I LLC System and method for generating optimally compressed data from a plurality of data compression/decompression engines implementing different data compression algorithms
6888893, Jan 05 2001 ZHIGU HOLDINGS LIMITED System and process for broadcast and communication with very low bit-rate bi-level or sketch video
6909383, Oct 05 2002 Qualcomm Incorporated Systematic encoding and decoding of chain reaction codes
6909745, Jun 05 2001 AT&T Corp. Content adaptive video encoder
6938073, Nov 14 1997 R2 SOLUTIONS LLC Method and apparatus for re-formatting web pages
6944740, Mar 27 2002 International Business Machines Corporation Method for performing compressed I/O with memory expansion technology
6952409, May 17 1999 Accelerator system and method
6959005, Oct 14 1999 Cisco Technology, Inc. Dual-channel communications protocol providing enhanced capabilities for modems
6959110, Aug 17 2000 Nvidia Corporation Multi-mode texture compression algorithm
6959359, Jul 14 1999 Hitachi, Ltd.; Hitachi Computer Peripherals Co., Ltd. Software prefetch system and method for concurrently overriding data prefetched into multiple levels of cache
6963608, Oct 02 1998 ARRIS ENTERPRISES LLC Method and apparatus for providing rate control in a video encoder
6990247, Sep 20 1994 Ricoh Corporation Multiple coder technique
6993597, Oct 09 1995 Acacia Research Group LLC; SOTA SEMICONDUCTOR LLC Terminal apparatus
7007099, May 03 1999 Lucent Technologies Inc. High speed multi-port serial-to-PCI bus interface
7024460, Jul 31 2001 OPTIMORPHIX, INC Service-based compression of content within a network communication system
7050639, Nov 24 1999 General Electric Company Image data compression employing multiple compression code tables
7054493, Sep 21 1994 Ricoh Co., Ltd. Context generation
7069342, Mar 01 2001 Cisco Technology, Inc. Communication system with content-based data compression
7089391, Aug 23 2001 Intellectual Ventures I LLC Managing a codec engine for memory compression/decompression operations using a data movement engine
7102544, May 31 2005 TAHOE RESEARCH, LTD Method and system for improving memory interface data integrity in PLDs
7127518, Apr 17 2000 SONS OF INNOVATION LLC System and method for implementing application functionality within a network infrastructure
7129860, Jan 29 1999 Intellectual Ventures I LLC System and method for performing scalable embedded parallel data decompression
7130913, Mar 11 1999 Realtime Data LLC System and methods for accelerated data storage and retrieval
7161506, Dec 11 1998 Realtime Data LLC Systems and methods for data compression such as content dependent data compression
7181608, Feb 03 2000 Realtime Data, LLC Systems and methods for accelerated loading of operating systems and application programs
7190284, Nov 16 1994 Intellectual Ventures I LLC Selective lossless, lossy, or no compression of data based on address range, data type, and/or requesting agent
7245636, Oct 21 1999 KAROLS DEVELOPMENT CO LLC; KAROLS DEVELOPMENTCO LLC Method for operating a mobile radiotelephone network
7319667, Nov 15 2000 Cisco Technology, Inc. Communication system with priority data compression
7321937, Mar 11 1999 Realtime Data LLC System and methods for accelerated data storage and retrieval
7327287, Dec 09 2004 Massachusetts Institute of Technology Lossy data compression exploiting distortion side information
7330912, Oct 15 1999 XILINX, Inc. Configuration in a configurable system on a chip
7352300, Dec 11 1998 Realtime Data LLC Data compression systems and methods
7358867, Dec 11 1998 Realtime Data LLC Content independent data compression method and system
7376772, Feb 03 2000 Realtime Data LLC Data storewidth accelerator
7378992, Dec 11 1998 Realtime Data LLC Content independent data compression method and system
7386046, Feb 13 2001 Realtime Adaptive Streaming LLC Bandwidth sensitive data compression and decompression
7395345, Mar 11 1999 Realtime Data LLC System and methods for accelerated data storage and retrieval
7400274, Oct 03 2000 Realtime Data LLC System and method for data feed acceleration and encryption
7415530, Mar 11 1999 Realtime Data LLC System and methods for accelerated data storage and retrieval
7417568, Oct 03 2001 Realtime Data, LLC System and method for data feed acceleration and encryption
7548657, Jun 25 2005 General Electric Company Adaptive video compression of graphical user interfaces using application metadata
7552069, Dec 23 1999 DS-IQ, INC Techniques for optimizing promotion delivery
7565441, Jul 23 2001 Image transfer and archival system
7711938, Jun 24 1993 COASES INVESTMENTS BROS L L C Multistandard video decoder and decompression system for processing encoded bit streams including start code detection and methods relating thereto
7714747, Dec 11 1998 Realtime Data LLC Data compression systems and methods
7777651, Oct 03 2000 Realtime Data LLC System and method for data feed acceleration and encryption
8004431, Dec 09 2008 Qualcomm Incorporated Fast parsing of variable-to-fixed-length codes
8054879, Feb 13 2001 Realtime Adaptive Streaming LLC Bandwidth sensitive data compression and decompression
8073047, Feb 13 2001 Realtime Adaptive Streaming LLC Bandwidth sensitive data compression and decompression
8090936, Feb 03 2000 Realtime Data, LLC Systems and methods for accelerated loading of operating systems and application programs
8112619, Feb 03 2000 Realtime Data LLC Systems and methods for accelerated loading of operating systems and application programs
8275897, Mar 11 1999 Realtime Data, LLC System and methods for accelerated data storage and retrieval
8502707, Dec 11 1998 Realtime Data, LLC Data compression systems and methods
8504710, Mar 11 1999 Realtime Data LLC System and methods for accelerated data storage and retrieval
8553759, Feb 13 2001 Realtime Adaptive Streaming LLC Bandwidth sensitive data compression and decompression
8643513, Dec 11 1998 Realtime Data LLC Data compression systems and methods
8692695, Oct 03 2000 Realtime Data, LLC Methods for encoding and decoding data
8717203, Dec 11 1998 Realtime Data, LLC Data compression systems and methods
8717204, Oct 03 2000 Realtime Data LLC Methods for encoding and decoding data
8719438, Mar 11 1999 Realtime Data LLC System and methods for accelerated data storage and retrieval
8723701, Oct 03 2000 Realtime Data LLC Methods for encoding and decoding data
8742958, Oct 03 2000 Realtime Data LLC Methods for encoding and decoding data
8756332, Mar 11 1999 Realtime Data LLC System and methods for accelerated data storage and retrieval
8867610, Feb 13 2001 Realtime Adaptive Streaming LLC System and methods for video and audio data distribution
8880862, Feb 03 2000 Realtime Data, LLC Systems and methods for accelerated loading of operating systems and application programs
8929442, Feb 13 2001 Realtime Adaptive Streaming LLC System and methods for video and audio data distribution
8933825, Dec 11 1998 Realtime Data LLC Data compression systems and methods
8934535, Feb 13 2001 Realtime Adaptive Streaming LLC Systems and methods for video and audio data storage and distribution
9054728, Dec 11 1998 Realtime Data, LLC Data compression systems and methods
9116908, Mar 11 1999 Realtime Data LLC System and methods for accelerated data storage and retrieval
9141992, Oct 03 2000 Realtime Data LLC Data feed acceleration
9143546, Oct 03 2000 Realtime Data LLC System and method for data feed acceleration and encryption
20010019630,
20010031092,
20010032128,
20010047473,
20010052038,
20010054131,
20020037035,
20020069354,
20020078241,
20020080871,
20020097172,
20020101367,
20020104891,
20020126755,
20020169950,
20020191692,
20030030575,
20030034905,
20030058873,
20030084238,
20030090397,
20030142874,
20030191876,
20040042506,
20040056783,
20040073710,
20040073746,
20060015650,
20060181441,
20060181442,
20060184687,
20060184696,
20060190644,
20060195601,
20070043939,
20070050514,
20070050515,
20070067483,
20070083746,
20070096954,
20070109154,
20070109155,
20070109156,
20070174209,
20080232457,
20090125698,
20090154545,
20090287839,
20100011012,
20100316114,
20100318684,
20100332700,
20110037626,
20110199243,
20110208833,
20110231642,
20110235697,
20110285559,
20120194362,
20120239921,
20140022098,
20140022099,
20140022100,
20140023135,
20140028480,
20140105270,
20140105271,
20140218220,
20150009051,
20150012507,
20150113182,
20150268969,
DE4127518,
EP164677,
EP185098,
EP283798,
EP405572,
EP493130,
EP587437,
EP595406,
EP718751,
EP928070,
GB2162025,
JP11149376,
JP4241681,
JP6051989,
JP9188009,
RE40092, May 11 1998 Operating Systems Solutions, LLC Method for quickly booting a computer system
WO36754,
WO157642,
WO157659,
WO163772,
WO239591,
WO9414273,
WO9429852,
WO9502873,
WO9529437,
WO9748212,
WO9839699,
WO9908186,
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