| 摘要 |
Luminance components from multiple video signals are separated and compressed (151, 157). An output signal having sequential output horizontal line periods is formed and the compressed luminance components are inserted in the output horizontal line periods. Chroma components are compressed (152, 158) by a higher compression factor and inserted in the blanking intervals. The two color video signals are compressed into one standard 4.2 Mhz channel, permitting the system to replace directly any existing 6Mhz audio/video transmission system. An encoder (154) combines plural video channels to form an output channel for transmission, using two decoders for separating the input video signal into respective luminance and chroma signals. A compressor compresses the signals, and a multiplexer selects alternately between the decoders. A luminance expander at the decoder expands the luminance data, and a demultiplexer alternately produces portions of the time-expanded digital luminance data corresponding to respective ones of the video channels. Sync information is regenerated at the decoders from the vertical sync pulses which are left intact in the transmitted signal.
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