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Old 04-07-2016, 10:10 PM
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wa2ise wa2ise is offline
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Join Date: Dec 2002
Location: USA
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I took another look at the group delay, it's worse than I had remembered. I updated the diagrams above. About 250nsec for luma and 300nsec. However, the spectrum that would now be chroma only gets some group delay predistortion and thus it still looks okay on a TV set.
My other filter's frequency and group delay response:

And the circuit:
It's a tradeoff between frequency and group delay.
You'll have to decide which looks better.
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Last edited by wa2ise; 04-07-2016 at 10:54 PM.
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