Abstract: A plurality of media data coding and multiplexing apparatus are connected, a video signal having a large information amount is processed in parallel in the plurality of media data coding and multiplexing apparatus, other media data pieces of an audio signal and a data signal are processed in one of the plurality of the media data coding and multiplexing apparatus, and a multiplexing section of the one of the plurality of the media data coding and multiplexing apparatus combines the signals and output multiplex streams output from other media data coding and multiplexing apparatus into one output multiplex stream.

Abstract: A call establishing control unit 6 of a communication terminal A sends a call through a transmission interface unit 5a in a bearer appropriate to multimedia communication, establishes a communication channel, sends a call through a transmission interface unit 5b in a bearer appropriate to a group of additional information and control information and establishes another communication channel. A video codec 1 and an audio codec 2 perform the multimedia communication through a multiplexing and demultiplexing unit 4 and the transmission interface unit 5a. An additional information and control information processing unit 3 performs communication of additional information and control information through the transmission interface unit 5b.

Abstract: The object of this invention is to realize the correct and prompt synchronization of data in decoding and reproducing multiplexed coded data multiplexed with a plurality of media coded data in the unit of packet without regard to the configuration or characteristics of the apparatus. To achieve a data decoder that can synchronize the video and audio data correctly, the timing controller obtains a buffering time indicated by the time difference between the decoding end time and the specified presentation time contained in the data, and data buffering is performed by buffer memory. The video decoding end time is latched from the system time counter according to a timing pulse generated by the video decoder when the first decoded data is output from video decoder after the data decoder is activated.

Abstract: Four media data coding and multiplexing apparatus 1 to 4 are connected, a video signal 100 having a large information amount is processed in parallel in the media data coding and multiplexing apparatus 1 to 4, other media data pieces of an audio signal 240 and a data signal 340 are processed in the media data coding and multiplexing apparatus 4, and a multiplexing section 44 of the media data coding and multiplexing apparatus 4 combines the signals and output multiplex streams 119, 129, and 139 output from other media data coding and multiplexing apparatus 1 to 3 into one output multiplex stream 149 finally.