Digital video signal component processing using key signal - converts components in upper data hierarchy for rate matching to capacity of channels in lower hierarchy

摘要

The drives of two D1 video tape recorder/reproduces (1, 2) are synchronised (3) for recording the luminance component (Y) and two chrominance components (CR, CB) of the digital signal. The luminance component (Y) and a KEY component in the upper hierarchy are converted by a device (4) including a roundoff stage (13) from 10 to 8 bits per data word, and a combiner (15) of the four KEY bits with the two subtracted (14) bits and the roundoff. ADVANTAGE - Digital component signals of upper hierarchy can be processed without error on channels of lower hierarchy of CCIR Recommendation 601-1 standard.