Carl wrote:
I was looking at a receiver catalog, and some of the receivers were
advertised as containing a "DSP comb filter" which could be turned on
when needed.

Can anyone tell me what a comb filter does and when it would be used?
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As others have mentioned, Comb Filtes are often used in video
applications.
This link dose a pretty good job of explaining what they are and why
they are used.

http://members.aol.com/ajaynejr/vidcomb.htm

Terry