[sdiy] Multi-output comb filter?

Corey K coreyker at gmail.com
Tue May 22 06:52:36 CEST 2018


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.
> >
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at synth-diy.org
> > http://synth-diy.org/mailman/listinfo/synth-diy
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy
>
-------------- next part --------------
   Easiest way: place a high pass filter in series with your comb
   filter.Â

   On Mon, May 21, 2018, 21:15 cheater00 cheater00
   <[1]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
     <[2]tom at electricdruid.net> wrote:
     >
     >
     >> On 21 May 2018, at 11:24, Ingo Debus <[3]igg.debus at gmail.com>
     wrote:
     >>
     >>
     >>> Am 21.05.2018 um 06:24 schrieb [4]rsdio at audiobanshee.com:
     >>>
     >>> Youâll 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?
     >
     > Youâll still get constructive and destructive interference that
     ends up favoring some frequencies and penalizing others. With *many*
     taps (or delays)Â  you could build a specific frequency response,
     but youâre basically building an FIR filter by analog means, and it
     wouldnât be cheap or simple.
     >
     >
     > _______________________________________________
     > Synth-diy mailing list
     > [5]Synth-diy at synth-diy.org
     > [6]http://synth-diy.org/mailman/listinfo/synth-diy
     _______________________________________________
     Synth-diy mailing list
     [7]Synth-diy at synth-diy.org
     [8]http://synth-diy.org/mailman/listinfo/synth-diy

References

   1. mailto:cheater00 at gmail.com
   2. mailto:tom at electricdruid.net
   3. mailto:igg.debus at gmail.com
   4. mailto:rsdio at audiobanshee.com
   5. mailto:Synth-diy at synth-diy.org
   6. http://synth-diy.org/mailman/listinfo/synth-diy
   7. mailto:Synth-diy at synth-diy.org
   8. http://synth-diy.org/mailman/listinfo/synth-diy


More information about the Synth-diy mailing list