[PD] biquad equation for vcf~?

[brandon zeeb]

You might also find this file helpful, a kind of filter bible:
http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt

On Mon, Sep 27, 2010 at 5:29 AM, cyrille henry <ch at chnry.net> wrote:

> hello,
> you have some exter to compute biquad~ coef in ggee/filter repertory.
>
> i also made some abstraction to compute bq~ coef.
> you can find them in nusmuk directory in svn.
>
> Cyrille
>
>
> Le 27/09/2010 10:34, Maurizio Giri a écrit :
>
>  Hi, I'm trying to convert some PD patches to MaxMSP.
>> However I have a problem with the vcf~ object, it seems it doesnt have an
>> EXACT equivalent in maxmsp: reson~, svf~, and the filtergraph~ bandpass all
>> sound different from vcf~
>> I'd like to use biquad~ to emulate a vcf~ filter, but I don't have the
>> vcf~ formula to calculate the coefficients.
>> Does somebody know how I can calculate them?
>> As I said filtergraph~, reson~ and the other maxmsp objects are not
>> identical to vcf~ so they are not good for my pourpose.
>>
>> TIA!
>> mau
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