Video telephone system

Details Video telephone system Video telephone system

H - Electricity

04

M

H04M 11/06 (2006.01) G10L 19/00 (2006.01) H04N 7/12 (2006.01) H04N 7/14 (2006.01) H04N 7/50 (2006.01) H04N 7/52 (2006.01) H04N 7/60 (2006.01) G10L 19/04 (2006.01)

Patent

CA 2076364

2076364 9113515 PCTABS00007 Apparatus (100) and method are provided for the simultaneous transmission of video information and audio information in substantially real time over an ordinary voice grade telephone line (384) having limited bandwidth in the range of about 300-3400 Hz. Because of the limited bandwidth of the ordinary telephone line (384), the video and audio information are compressed before transmission thereof. Each of the video information and audio information is separately compressed, mixed together and then further compressed. After the further compression, a composite signal, which includes the mixture of video and audio information, is asynchronously transmitted over the same bandwidth of the ordinary telephone line (384). Upon reception, the compressed information is expanded and separate video information and audio information are reproduced for viewing and hearing by the receiving party.

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