This invention relates to a karaoke CD format and a device for controlling audio signals utilizing the karaoke CD format which provides a user with selective reproduction of the voice of a player. The karaoke CD format includes a CD format divided into video sectors and audio sectors. The audio sectors are further divided into a part for recording accompaniment sound and playing sound at the same time and a part for recording accompaniment sound only. There is provided record coding information for distinguishing the parts. An apparatus, method and storage medium for reproducing digital data, are discussed. According to an embodiment, the apparatus includes a demultiplexing circuit to receive data units of digital audio data and separate a system time information from at least one data unit of digital audio data, the digital audio data including at least two of: 1) a first type of digital audio data, and 2) a second type of digital audio data which includes at least one content different from the first type of digital audio data; each type of digital audio data being specified by attribute information, which has: a) first information for indicating a coding mode of the digital audio data, and b) second information, different than the first information, for identifying one of the first type of digital audio data and the second type of digital audio data.
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0. 6. A device for processing a digital signal, comprising:
an audio signal processor receiving data units of digital audio data, the data units corresponding to at least one of:
1) a first type of digital audio data, and
2) a second type of digital audio data which includes at least one content different from the first type of digital audio data;
each data unit including attribute information, which has:
a) coding information indicating a coding mode of the digital audio data, and
b) identification information, different than said coding information, identifying the data unit as one of the first type of digital audio data or the second type of digital audio data;
the audio signal processor extracting the identification information, and separating the data units of the first type from the data units of the second type using the identification information, said signal processor including a system time clock, a memory for storing the data units of the first type and the second type, and first and second audio presentation parts receiving the system time clock to control a presentation timing of the data units of the first type or the second type; and
a control circuit controlling the audio signal processor to output an audio signal corresponding to the data units of one of the first or second types, based on the identification information.
0. 1. A device for reproducing a digital signal recorded on a medium, the digital signal including a video signal and an audio signal, the audio signal being composed of data units, the data units corresponding to at least one of:
1) a first type of digital audio data, and
2) a second type of digital audio data which includes at least one content different from the first type of digital audio data;
each data unit including attribute information, which has:
a) first information indicating a coding mode of the digital audio data, and
b) second information, different than said first information, identifying the data unit as one of the first type of digital audio data or the second type of digital audio data;
the data units of audio signal being interleaved between data units of video signal, comprising:
a demodulator for demodulating the digital signal to restore an original signal;
a signal processor for receiving the audio signal, demodulated by the demodulator, extracting the second information, separating the data units corresponding to a first type of audio signal from data units corresponding to a second type of audio signal based on the extracted second information, said signal processor including a system time clock, a memory for storing the data units corresponding to the first type and the second type of audio signal, and first or second audio presentation parts receiving the system time clock to control a presentation timing of the first type or the second type of audio signal; and
a controller, coupled to the signal processor, controlling the signal processor to output the data units corresponding to the first type or the second type of the audio signal designated by a user input, wherein the first or second type of audio signal, designated by the user input, is identified using the second information.
0. 4. A method for reproducing a digital signal recorded on a medium, said digital signal including a video signal and an audio signal, the audio signal being composed of data units, the data units corresponding to at least one of:
1) a first type of digital audio data, and
2) a second type of digital audio data which includes at least one content different from the first type of digital audio data;
each data unit including attribute information, which has:
a) first information indicating a coding mode of the digital audio data, and
b) second information, different than said first information, identifying the data unit as one of the first type of digital audio data or the second type of digital audio data;
the data units of audio signal being interleaved between data units of video signal, the method comprising the steps of:
demodulating the digital signal to restore an original signal;
receiving the demodulated audio signal;
extracting the second information;
separating the data units corresponding to a first type of audio signal from data units corresponding to a second type of audio signal based on the extracted second information, by storing the first and second types of audio signals in a memory, receiving the data units corresponding to the first and second types of audio signals in first and second audio presentation parts along with a system time clock to control a presentation timing of the first or second type of audio signal; and
outputting one of the first or second types of audio signals in response to a user input designating one of the first or second types of audio signals, wherein the first or second type of audio signal, designated by the user input, is identified using the second information.
0. 18. An apparatus for processing a digital data, comprising:
a demultiplexing circuit to receive data units of digital audio data and separate a system time information from at least one data unit of digital audio data, the digital audio data including at least two of:
1) a first type of digital audio data, and
2) a second type of digital audio data which includes at least one content different from the first type of digital audio data;
each type of digital audio data being specified by attribute information, which has:
a) first information for indicating a coding mode of the digital audio data, and
b) second information, different than said first information, for identifying one of the first type of digital audio data and the second type of digital audio data;
a data storage to temporarily store the first and second types of digital audio data;
an audio data processor to process at least one of first and second types of digital audio data identified by the second information, the audio data processor including a decoder to decode the compressed digital audio data;
a system time clock circuit to receive the system time information and generate a system time clock based on the system time information; and
a control circuit, coupled to the audio data processor, to control a presentation timing of the first or second types of digital audio data in response to the system time clock from the system time clock circuit.
0. 28. A method for processing a digital data, comprising:
receiving data units of digital audio data, the data units corresponding to at least two of:
1) a first type of digital audio data, and
2) a second type of digital audio data which includes at least one content different from the first type of digital audio data;
each type of digital audio data being specified by attribute information, which has:
a) first information for indicating a coding mode of the digital audio data, and
b) second information, different than said first information, for identifying one of the first type of digital audio data and the second type of digital audio data;
separating a system time information from at least one of data units of first or second types of digital audio data and separating the first type of digital audio data from the second type of digital audio data using the second information and storing the first and second types of digital audio data;
processing at least one of the first and second types of digital audio data to output the first or second types of digital audio data in response to a designation signal, the designation signal for selecting the first or second types of digital audio data; and
controlling a presentation timing of the first or second types of digital audio data in response to the system time information,
wherein the first or second types of digital audio data is identified by the second information, in response to the designation signal.
0. 2. A device as claimed in
0. 3. A device as claimed in
an MPEG audio decoder for decoding the audio signal.
0. 5. The method of
0. 7. The device of
0. 8. The device of
0. 9. The device of
0. 10. The device of
0. 11. The device of
a demodulator demodulating the digital audio data prior to receipt by the audio signal processor.
0. 12. A method for processing a digital signal, comprising:
receiving data units of digital audio data, the data units corresponding to at least one of:
1) a first type of digital audio data, and
2) a second type of digital audio data which includes at least one content different from the first type of digital audio data;
each data unit including attribute information, which has:
a) coding information indicating a coding mode of the digital audio data, and
b) identification information, different than said coding information, identifying the data unit as one of the first type of digital audio data or the second type of digital audio data;
extracting the identification information;
separating the data units of the first type from the data units of the second type using the identification information by storing the data units of the first and second types in a memory, receiving the data units of the first and second types in first or second audio presentation parts along with a system time clock to control a presentation timing of data units of the first or second type; and
outputting audio data corresponding to the data units of the first or second type in response to the identification information.
0. 13. The method of
0. 14. The method of
0. 15. The method of
comparing the system time clock to timing information in the digital audio data; and
outputting the audio data with a timing based on the comparison.
0. 16. The device of
0. 17. The device of
0. 19. The apparatus of
0. 20. The apparatus of
0. 21. The apparatus of
0. 22. The apparatus of
0. 23. The apparatus of
0. 24. The apparatus of
a demodulator to demodulate the digital audio data to an original data, prior to receipt by the demultiplexing circuit.
0. 25. The apparatus of
wherein the first or second type of audio data, designated by the request, is identified using the second information.
0. 26. The apparatus of
a D/A converter coupled to the audio data processor to convert at least one of the first and second types of digital audio data to analog signal.
0. 27. The apparatus of
wherein the audio data processor is configured to process the vocal data.
0. 29. The method of
separating the digital audio data from the digital video data, by using the first information.
0. 30. The method of
0. 31. The method of
identifying the coding mode of the first or second types of digital audio data based on the first information, the coding mode for indicating MPEG audio data, and
wherein the processing step includes decoding the digital audio data encoded in MPEG format.
0. 32. The method of
demodulating the digital audio data to an original data, prior to receipt by the receiving step.
0. 33. The method of
converting the designated first or second types of digital audio data to analog signal.
0. 34. The method of
wherein the processing step processes the vocal data.
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According to an embodiment, the present invention provides an apparatus for processing a digital data, comprising: a demultiplexing circuit to receive data units of digital audio data and separate a system time information from at least one data unit of digital audio data, the digital audio data including at least two of: 1) a first type of digital audio data, and 2) a second type of digital audio data which includes at least one content different from the first type of digital audio data; each type of digital audio data being specified by attribute information, which has: a) first information for indicating a coding mode of the digital audio data, and b) second information, different than the first information, for identifying one of the first type of digital audio data and the second type of digital audio data; a data storage to temporarily store the first and second types of digital audio data; an audio data processor to process at least one of first and second types of digital audio data identified by the second information, the audio data processor including a decoder to decode the compressed digital audio data; a system time clock circuit to receive the system time information and generate a system time clock based on the system time information; and a control circuit, coupled to the audio data processor, to control a presentation timing of the first or second types of digital audio data in response to the system time clock from the system time clock circuit.
According to an embodiment, the present invention provides a method for processing a digital data, comprising: receiving data units of digital audio data, the data units corresponding to at least two of: 1) a first type of digital audio data, and 2) a second type of digital audio data which includes at least one content different from the first type of digital audio data; each type of digital audio data being specified by attribute information, which has: a) first information for indicating a coding mode of the digital audio data, and b) second information, different than the first information, for identifying one of the first type of digital audio data and the second type of digital audio data; separating a system time information from at least one of data units of first or second types of digital audio data and separating the first type of digital audio data from the second type of digital audio data using the second information and storing the first and second types of digital audio data: processing at least one of the first and second types of digital audio data to output the first or second types of digital audio data in response to a designation signal, the designation signal for selecting the first or second types of digital audio data; and controlling a presentation timing of the first or second types of digital audio data in response to the system time information, wherein the first or second types of digital audio data is identified by the second information, in response to the designation signal.
This invention is to be explained in detail hereinafter, referring to the attached drawings.
A subheader in accordance with this invention is shown in FIG. 4. To distinguish audio data Aa, containing both vocal sound and accompaniment sound, and audio data Ab, containing only accompaniment data, there is provided subheader information in an audio packet, the subheader includes coding information encoded therein with a distinguishing value applied thereto.
The coding information is, included into a subheader of each sector at data encoding as a distinguishing value, standardized as $0 F in case of MPEG video, and $7 F in case of MPEG audio, wherein new coding information (for example 3F) is added to use for a distinguishing signal for the audio data sector Aa, having both vocal sound and accompaniment sound, and the audio data sector Ab having only accompaniment sound.
Interleaving of MPEG video and MPEG audio sectors is as shown in FIG. 5. The interleaving of video data and audio data sectors, in general has 4 to 5 consecutive video sectors V with one audio sector A added thereto, where coding information is used to distinguish a sector containing the encoded Aa and Ab.
Since the increase of buffer size due to the newly added audio sectors Aa and Ab is infinitesimal compared to the image data, it can be ignored.
That is, the karaoke CD format in accordance with this invention includes a CD format divided into video sectors and audio sectors, and the audio sectors are further divided into a part Aa for recording both accompaniment sound and vocal sound at the same time and a part Ab for recording accompaniment sound only, and the audio sectors are further provided to record coding information for distinguishing between audio data stored in the two parts.
As shown in
The control part 30 controls the entire system according to the signal applied through a key matrix 80.
The demodulation part 40 includes a first demodulator 41 for carrying out EFM demodulation from the CD format provided to distinguish a part Aa for recording accompaniment sound and vocal sound at the same time, and a part Ab for recording accompaniment sound only, where the part is under the control of the control part 30, and a second demodulator 42 for demodulating signals recorded in interleaved sectors for a CD-ROM from the signal received from the first demodulator 41 and applying the second demodulated signal to the audio processing part 70 under the control of the control part 30, thereby demodulating the signal read in from the CD format provided to distinguish a part Aa, for recording accompaniment sound and vocal sound at the same time, and a part Ab, for recording accompaniment sound only, under the control of the control part 30.
The audio signal processing part 70 includes a CPU 71 for separating audio data and time data from the signal received from the second demodulator 42 under the control of the control part 30, a STC (System Time Clock) part 77 for generating a synchronizing signal using time information received from the CPU 71, a memory 72 for storing the audio data received from the CPU 71, an MPEG audio decoder 73 for decoding the MPEG audio data stored in the memory 72, a demultiplexer 74 for separating data received form the MPEG audio decoder 73 into data corresponding to accompaniment sound and vocal sound and data corresponding to accompaniment sound and outputting the separated data under the control of the CPU 71, a first audio presentation part 75 for comparing the PTS (Presentation Time Stamp) in the data corresponding to the accompaniment sound received from the demultiplexer 74 to the signal received from the STC 77 to control presentation time of the data, and a second audio presentation part 76 for comparing the PTS (Presentation Time Stamp) in the data corresponding to accompaniment sound and vocal sound received from the demultiplexer 74 to the signal received from the STC 77 to control presentation time of the data, thereby processing the audio signal using signals received from the demodulation part 40 to separate the data into data corresponding to a first data containing accompaniment sound only, and outputting the separate data.
The switch 50 selects one of the data corresponding to the accompaniment sound and vocal sound, or to only the accompaniment sound received from the first and the second audio presentation parts 75 and 76 of the audio signal processing part 70 and transmits the selected data under the control of the control part 30.
The D/A converter 60 converts the data received from the switch 50 under the control of the control part 30.
The system and operation for processing a video signal is the same as for a conventional karaoke CD system.
Operation of the device for controlling a karaoke CD audio signal in accordance with this invention as described above is to be explained hereinafter.
The encoded karaoke-CD data having coding information applied thereto is added with a distinguishing value and has EFM signals demodulated through the first demodulation part 41 which is a EFM/CIRC (Cross Interleave Read Solomon Code) and errors of the CD are corrected. The interleaved data at encoding is demodulated through the second demodulation part 42 which is a CD-ROM decoder, and is separated into audio, video, and time data in the CPU 71.
In the instant, of audio data, the demultiplexing signal coming in at the reading in of the coding information is applied to the demultiplexer 74 for operation of the demultiplexer 74.
Of the data demultiplexed in the CPU 71, the MPEG audio data is stored in the memory 72 temporarily, has the compression restored through the MPEG audio decoder 73, and is transmitted. The demodulated audio data received from the MPEG audio decoder 73 is separated into audio data carrying accompaniment sound only and audio data carrying accompaniment sound and vocal sound through the demultiplexer 74, and applied to the first audio data presentation part 75 and the second audio presentation part 76 respectively under the control of the CPU 71.
The audio demultiplexing signal received from the CPU 71 controls the first audio presentation part 75 to compare the received audio data Ab, carrying accompaniment sound only out of the audio signal applied thereto, to a PTS to control the presentation time and controls the second audio presentation part 76 to compare the received audio data Aa, carrying voice, i.e., vocal sound and accompaniment sound out of the audio signal applied thereto to a PTS to control the presentation time. The audio data received from the first and the second audio presentation parts 75 and 76 is applied to the D/A converter 60 through a switching operation of the switch 50 under the control of the control part 30, where it is converted in the D/A converter 60 and output to a speaker.
In this instant, the switch 50 is operated under the control of the control part 30 which is operated according to the key signal applied through the key matrix 80.
Operation of a karaoke CD audio system is to be explained hereinafter, referring to FIG. 7.
First, a subheader and packet header are read 100, and demultiplexing is carried out to separate into an audio demultiplexing signal and a MPEG audio signal 101. The separated MPEG audio signal is decoded to separate into audio signals containing accompaniment sound only, and audio signals containing both vocal sound and accompaniment sound using the audio demultiplexing signal 102, and the PTS of each packet is read to synchronize and transmit signals 103.
The MPEG audio format, as shown in
As has been explained, this invention for a karaoke CD system increases the enjoyment of karaoke by reproducing audio data containing a player's voice, i.e., vocal sound and accompaniment sound, and audio data containing accompaniment sound selectively, which permits stereophony sound corresponding to the CD sound.
Although the invention has been described in conjunction with specific embodiments, it is evident that many alternatives and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, the invention is intended to embrace all of the alternatives and variations that fall within the spirit and scope of the appended claims.
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| Jun 19 2008 | LG Electronics Inc. | (assignment on the face of the patent) | / |
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