[sdiy] Multi-output comb filter?

[cheater00 cheater00]

Is it possible to build a delay based comb filter that's missing the
first peak? I.e. say we have a comb filter at 1 Hz, with peaks every 1
Hz, is it possible to also have a comb filter at 2 Hz with peaks every
1 Hz - perhaps using multiple delays? I know when you synthesize
waveforms using DSF ("discrete summation formula") synthesis, you can
create a waveform at any base frequency, with the partials spaced by
any constant amount of Hz, but I'm not sure how this would be done
with a delay based comb filter. Note, I'm talking about synthesizing
this in digital.

On Mon, May 21, 2018 at 4:45 PM, Tom Wiltshire <tom at electricdruid.net> wrote:
>
>
>> On 21 May 2018, at 11:24, Ingo Debus <igg.debus at gmail.com> wrote:
>>
>>
>>> Am 21.05.2018 um 06:24 schrieb rsdio at audiobanshee.com:
>>>
>>> You’ll get a lot further realizing that a comb filter has only a single input and a single output, where the constructive and destructive interference ends up favoring some frequencies and penalizing others.
>>
>> What if you use a multi-tap delay?
>
> You’ll still get constructive and destructive interference that ends up favoring some frequencies and penalizing others. With *many* taps (or delays)  you could build a specific frequency response, but you’re basically building an FIR filter by analog means, and it wouldn’t be cheap or simple.
>
>
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