[sdiy] Multi-output comb filter?

[cheater00 cheater00]

That's an interesting idea, thanks!

On Tue, May 22, 2018 at 7:04 AM, Corey K <coreyker at gmail.com> wrote:
> Option 2: write out the Z-transform for your comb filter. There will be one
> pole per peak, and these will be spaced at equal angles around a circle in
> the complex place. Add a zero to perfectly cancel the pole corresponding to
> the peak you want removed. This will in turn correspond to an FIR filter
> that you can run before or after your comb filter.
>
>
> On Mon, May 21, 2018, 21:54 cheater00 cheater00 <cheater00 at gmail.com> wrote:
>>
>> 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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