[PD] biquad equation for vcf~?

[cyrille henry]

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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