Fw: [PD] about filtergraph~

Jer Welter mrjester at fledge.watson.org
Thu Mar 18 23:11:52 CET 2004

> Anyone does know how calculate the parameters of a biquad filter from the
> center frequencie, bandwith and quality ?

Here are two references that may help:

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.


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