Circuitry designed for best separation of Y and C from a composite video signal. Standard circuitry uses analog bandpass and bandstop filters, which result in unclean separation of Luma from Chroma, possible phase shifts (hue changes), signal delays and a host of other undesirable effects. Comb filtering is a digital process, separating Y from C, based on “combing” out the chrominance signal from the luminance. It is called comb filtering because chroma resides in specific bands along the frequency axis which resemble a comb. The drawbacks of digital comb filtering are some undesirable effects due to digitization of the video signal, higher cost than analog filters and sometimes the need for time base correction prior to “combing” in order to obtain the best results.
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