Fw: [PD] about filtergraph~

Thomas Goepfer totoetlititi at free.fr
Fri Mar 19 08:48:47 CET 2004

Oh thanks, it is great !!!

----- Original Message ----- 
From: "Jer Welter" <mrjester at fledge.watson.org>
To: "Thomas Goepfer" <totoetlititi at free.fr>
Cc: <pd-list at iem.at>
Sent: Thursday, March 18, 2004 11:11 PM
Subject: Re: Fw: [PD] about filtergraph~

> > Anyone does know how calculate the parameters of a biquad filter from
> > center frequencie, bandwith and quality ?
> Here are two references that may help:
> http://aulos.calarts.edu/pipermail/music-dsp/1997-July/019624.html
> http://www-ccrma.stanford.edu/~jos/filters/BiQuad_Section.html
> The first is Robert Bristow-Johnson's BiQuad "cookbook recipes" for the
> various kinds of filter (such as lowpass, bandpass, highpass, shelving -
> is this what you mena by "quality"?)
> The second is the section of Julius Smith's Digital Filtering text on
> biquads.  The text as a whole is a very informative read.
> Jer

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