Data Transmission Protocol Of Video Phone

PURPOSE: A data transmission protocol of image communication equipment is provided to be capable of minimizing data loss except video and audio by multiplexing audio, video and control data. CONSTITUTION: For transmission and receive of compressed video and audio in the image communication equipment, header data for separating synchronous identification and audio/video data, transmission/receive data size according to communication access speed, compressed audio data, control index for ordering image quality select, image re-transmission, privacy mode, video data size change, etc., control data according to the control index, compressed video data are formed as one packet data frame. Preferably, the privacy mode is information which represents that audio and/or video is inversed or reversed.