Patent ID: 6646674
Filing Date: 2003-11-11
Classification: H04L,H04N

Abstract:
A TV telephone system in which encoding processing is preformed on an audio signal so as to generate compressed audio data, and interframe predictive encoding processing is preformed on a video signal, so as to generate INTRA (intraframe coding) video data not including interframe predictive coding signal and INTER (interframe coding) video data including interframe predictive coding signal, said system having a plurality of TV telephone apparatuses which perform communication with each other, via an IP (internet protocol) network, using said compressed audio data, INTRA video data and INTER video data, wherein said plurality of TV telephone apparatuses of said TV telephone system perform INTRA video data communication using the transfer control protocol (TCP), wherein each of said TV telephone apparatuses comprises:a microphone for capturing said audio signal; an audio signal compression section which generates said compressed audio data by performing audio compression and encoding of said audio signal captured by said microphone; a video camera for capturing a video signal; a video signal compression section which generates both said INTRA video data and said INTER video data by performing interframe predictive encoding for each frame of said video signal captured by said video camera; a UDP (user datagram protocol) section which performs UDP protocol processing of said compressed audio data output from said audio signal compression section, and which performs UDP protocol processing of INTER video data output from said video signal compression section, and which performs UDP protocol processing of a compressed audio data and INTER video data received via said IP network; a TCP (transmission control protocol) section which performs TCP protocol processing of said INTRA video data output from said video signal compression section, and which performs TCP protocol processing of an INTRA video data received via said IP network; an IP section which performs IP protocol processing of said compressed audio data and said INTER video data output from said UDP section and said INTRA video data output from said TCP section, and which performs IP protocol processing of said compressed audio data, said INTRA video data, and said INTER video data received via said IP network and output said compressed audio data and said INTER video data received via said IP network to said UDP section and output said INTRA video data received via said IP network to said TCP section; and a video decompression section which performs decompression and decoding of said INTER video data output from said UDP section and said INTRA video data output from said TCP section.