Comb filters in camcorders?
(From: Jeroen H. Stessen (Jeroen.Stessen@philips.com).) There is no need for a comb filter in a camcorder! Signals from the CCD are not first combined into CVBS to then be separated by a comb filter again. That would make no sense. (However, since modern camcorders are full function VCRs without a tuner, this function may still be needed for dealing with external video input. — sam) Other applications for delay lines are drop-out compensation and delay equalization between luminance and chrominance. Did you ever wonder what happened to the ultrasonic glass delay lines that were once used by the millions in every PAL television, for U/V separation? They were replaced in nearly *all* applications by the Philips switched capacitor delay lines TDA4660(-61,-62). (From: David Lawson (dlawson@ime.net).) the color signal(chroma) takes longer to process than does the b/w or luminance channel so to get the color to line up with the b/w picture, the B/W signal has to be delayed slightly.
