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Originally Posted by Andy
Removing the chroma from a composite video signal is not at all easy. It's like unscrambling an egg. Even a sophisticated digital comb filter that compares several complete frames of video can't do it perfectly.
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It can't be all that hard - I was under the impression that composite video was two seperate signals, tied together, but at somewhat different frequencies - it would be a matter of 'tuning' in the right one.
Besides, I was at Rat Shack yesterday, and saw a little box that converts composite video to S-Video. Actually, it was meant for converting video and audio - it converts composite to S-Video, and analog stereo audio to digital PCM audio. It was a little bitty box, about the size of a deck of cards, and was marked down to $3.74 or something like that. I was probably on clearance because of the utter uselessness of converting analog audio to digital PCM... Think about it, if you've got hardware that takes digital PCM, it also takes analog audio, and the point of converting it somewhere else is moot - it's not gonna sound any better... But hey, the box could be used just for the video, if you had an application where you wanted to filter the chroma and luma from each other.
-Ian