[sdiy] Multi-output comb filter?

Neil Johnson neil.johnson71 at gmail.com
Tue May 22 13:00:10 CEST 2018

cheater00 wrote:
>    So what I thought might be feasible would be to eg get a single peak at
>    1 Hz, create a 1 Hz comb filter, then subtract a 2 Hz comb from it so
>    you're left with peaks at 1, 3, 5, 7, etc Hz, then subtract a 3 Hz
>    comb, so you're left with 1, 5, -6, 7, 9, 11, -12, etc Hz, then
>    subtract a 5 Hz comb etc.

You don't get peaks with comb filters, you get notches.
If you only want one notch why not build a notch filter?

> If you look at the first 249 such filters

By the time you've faffed around with all this you might as well just
implement an FFT.

(posting as plaintext, because readability counts)

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