A high-quality digital video signal is transmitted with low bit rate in a digital audio system. Several digital audio systems have been developed for professional and consumer use. The transmission rate of most two-channel digital recorders is approximately 2 Mbit/s. For digital television, systems have been worked out by CCIR, SMPTE, and EBU. Digital video tape recorders are also under development; their transmission rate is about 300 Mbit/s using a component television signal. Since the ratio of video to audio rates is more than 100, it is difficult for digital audio recording media to capably record a television video signal. A new signal format for still-frame picture transmission is presented. The advantages and disadvantages of composite-signal and component-signal methods have been studied. The format can be extended to partial moving pictures, computer-generate moving graphics, and still pictures for high-definition television (1125 lines).
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