Stevens, Davis, Miller & Mosher
Multi-media communication apparatus for transmitting audio information, video information and character information simultaneously
 In a multi-media communication apparatus, a frame control is provided for detecting the quantity of a compressed video signal stored in a video data buffer on the basis of information supplied from a buffer control and for changing over the compression scheme in an audio codec part and the channel allocation scheme in a multiplexing/demultiplexing part according to the detected quantity of the video signal. When the buffer control informs that the quantity of the compressed video signal stored in the video data buffer exceeds a predetermined threshold, the frame control instructs the multiplexing/demultiplexing part to decrease the audio channels and informs the audio codec part to use the corresponding audio encoding scheme. When the motion of the video signal is slowed down, and the frame control is informed from the buffer control that the quantity of the video signal stored in the video data buffer decreases, the frame control instructs the audio codec part to restore the initially set compression scheme and also instructs the multiplexing/demultiplexing part to restore the initially set frame structure. 
Matsushita Electric Industrial Co., Ltd.
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Toshiyuki
Fujii