[PD] Formant filter ?

Maximiliano Estudies maxiestudies at gmail.com
Tue Jun 25 07:35:25 CEST 2019


There is also this website
https://www.easycalculation.com/physics/electromagnetism/biquad-calculator.php
where you can calculate coefficients.

El mar., 25 jun. 2019 a las 4:22, Ingo (<ingo at miamiwave.com>) escribió:

> Thanks, Alexandre!
>
>
>
> This looks very helpful!
>
>
>
> Ingo
>
>
>
> *From:* Alexandre Torres Porres [mailto:porres at gmail.com]
> *Sent:* Monday, June 24, 2019 9:41 PM
> *To:* William Huston
> *Cc:* Ingo; pd-list
> *Subject:* Re: [PD] Formant filter ?
>
>
>
> I'd rather use a more proper bandpass filter than bp~, which does note
> have a nice symmetric response. You could use [biquad~] instead, but the
> issue is that you'd need to generate coefficients for it. I provide the
> [else/bicoeff] object in else that calculates biquad coefficients and I
> just uploaded an update in my tutorial that shows how to do that by hand in
> a pd patch, see:
> https://github.com/porres/Live-Electronic-Music-Tutorial/blob/master/Tutorial/Vol.2/Part.09-Filters-Reverb-Karplus/31-Filters(Advanced)/2.Filters/4.EQCookbook.%5Bbiplot%5D.pd
>
>
>
> Em seg, 24 de jun de 2019 às 12:04, William Huston <
> williamahuston at gmail.com> escreveu:
>
> I have one I built, it's basically 3x bp~ stages in parallel, with each
> stage being a double bp~ in series.
>
>
>
> Get it here:
>
> https://github.com/WilliamAHuston/BHPDtoolkit
>
>
>
> It's called:
>
> abstractions/BHFormantx3~.pd
>
> also
>
> abstractions/FormantControl.pd
>
>
>
> I have a fake resonance built in, basically an osc~ at the cutoff freq of
> the filter which you can blend it.
>
>
>
> It's not pretty, I built this as a PD novice. But it works well.
>
>
>
> (You may want to grep through the patches folder to find some examples
> where I use this.)
>
>
>
> One use I found for it, which is very cool, is to create a source which is
> rich in overtones, saw or square or a gritty granular snippet, send it to
> the filter.
>
>
>
> Tune the 3 bp~'s to a chord, and use a midi controller to set the root of
> the chord, to play melodies *on the filter*.
>
>
>
> HTH,
>
> BH
>
>
>
>
>
> On Mon, Jun 24, 2019, 1:50 AM Ingo <ingo at miamiwave.com> wrote:
>
> OK! I just googled "Formant Table" and got lots of results with the
> frequencies of each formant.
> I guess by using 3 bandpass filters I should be able to build one as an
> abstraction.
>
> Ingo
>
> > Can anyone point me to a formant filter external that is working and not
> too heavy on the CPU?
>
>
>
>
>
>
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-- 
Maximiliano Estudies
+49 176 36784771
omslo.com
maxiestudies.com
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