Chrominance subcarrier
From Infogalactic: the planetary knowledge core
The chrominance subcarrier is a separate subcarrier signal that carries the color information during transmission of a video signal. It is modulated and synchronized using the colorburst signal and then attached to the back porch of the color composite video signal. By synchronizing the subcarrier with the local oscillator of the television receiver, the RGB colors can be decoded successfully.
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