The ornamental design for a microphone, as shown and described.
FIG. 1 is a perspective view of a microphone showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof; and,
FIG. 6 is a perspective view thereof;
FIG. 7 is a front view thereof;
FIG. 8 is a rear view thereof;
FIG. 9 is a right side view thereof; and,
FIG. 10 is a left side view thereof.
The broken line immediately adjacent the top of the shaded region of FIGS. 1–5 represents an unclaimed boundary of the design. The broken line showing of the remainder of the microphone is for environmental purposes only and forms no part of the claimed design. The gray-scale shading in the circular regions indicates a contrast of appearance to the remainder of the shaded region and does not depict any particular color.