Television – Two-way video and voice communication – User positioning
Patent
1995-03-30
1996-04-30
Chan, Wing Fu
Television
Two-way video and voice communication
User positioning
379 94, 379 96, 379202, H04M 1100
Patent
active
055129382
ABSTRACT:
In the PC-based teleconference terminal 200 includes a PC 110 and a video codec unit 130, a network control unit 220 and an audio codec unit 240 which are all constructed on the same expansion board, with the video codec unit 130, the audio codec unit 240 and the network control unit 240 all connected to the computer bus 114 so as to be able to transfer audio data, video data, data and AV multiframes between themselves. The audio codec unit 240 is equipped with a audio clock generation unit 241 for generating an audio sampling signal of 8 kHz through self-excited oscillation. The CPU 111 in the PC 110 executes frame alignment by executing the AV multiplexer/separator software 212 stored in the memory 112 and executes the AV multiframe conversion and separation for H series recommendation on the CCITT, as well as adjusting any shortages or surpluses of reproduction audio data which arise due to synchronization slips between the audio sampling clock and the network clock by executing the synchronization slip control software 211.
REFERENCES:
patent: 5072442 (1991-12-01), Todd
patent: 5374952 (1994-12-01), Flohr
"Line Transmission of Non-Telephone Signals", Narrow-Band Visual Telephone Systems and Equipment, CCITT, Recommendation H.320, Geneva 1990.
Chan Wing Fu
Matsushita Electric - Industrial Co., Ltd.
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