Thanks.
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Once broadcast goes digital will a similar circuit be possible? Obviously it would be quite a bit more complex, but I mean could it have a similar output?
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Most likely yes.
Digital TV systems all use 3 signals, luma (B&W) and two color difference signals (U and V, or Cr and Cb, or Pr and Pb). The luma gets sent thru a DAC chip to the "Y" pins of an S video connector. The U and V can be either sent thru a pair of DAC chips to feed "component" output jacks on the back of the DTV decoder/receiver, or converted/modulated onto a chroma subcarrier and then sent to the "Ch" pins of an S video connector, or then merged with the luma to make composite video (yellow core RCA connector). All DTV boxes will likely have S video avaliable, and there we can do the above filtering trick. If the DTV designers are smart, they could do this filtering internally (make it a selectable menu option).