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For what it's worth, Hoffman had a wideband system which used R-Y and B-Y detectors but after a chrominance channel where the high bandwidth chroma signal was delayed while the narrowband was not. This is a bizarre method and was used briefly (around 1955, I think), but I would prefer I, Q demod. The NTSC spent a lot of effort to determine the resolution and criticality of the eye for various colours and I think I, Q demod would be as good as HDTV because the eye does not see large bandwidth in blue or yellow.
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