[sdiy] Multi-output comb filter?

cheater00 cheater00 cheater00 at gmail.com
Tue May 22 06:53:44 CEST 2018


Good idea, but that's still going to pass some of it through. I meant
a perfect removal.

On Tue, May 22, 2018 at 6:52 AM, Corey K <coreyker at gmail.com> wrote:
> Easiest way: place a high pass filter in series with your comb filter.
>
> On Mon, May 21, 2018, 21:15 cheater00 cheater00 <cheater00 at gmail.com> wrote:
>>
>> 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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