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¿µ¹®Ç¥Áظí Frame-synchronous control and indication signals for audiovisual systems
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¿µ¹®³»¿ë¿ä¾à Digital audiovisual services are provided by a transmission system in which the relevant signals are multiplexed onto a digital path using the frame structure defined in ITU-T Rec. H.221. In addition to the audio, video, user data and telematic information, these signals include information for the proper functioning of the system. The additional information has been named Control and Indication (C&I) to reflect the fact that while some bits are genuinely for "control", causing a state change somewhere else
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