Re: How to produce IIR filter coefficients from a set ofpoints describing the frequency response

----- Original Message -----

From: Victor.Lazzarini@...

To: csound-devel@...

Sent: Friday, May 15, 2009 10:06 PM

Subject: Re: [Cs-dev] How to produce IIR filter coefficients from a set ofpoints describing the frequency response

This absolutely impressive, but scary!

Then there's SAGE, which is a mammoth math software incorporating nearly

every open source math program in existence  (including numpy, Singular,

GAP, ATLAS, Cython, and about three dozen others.)  It also has interfaces

for Mathematica, Matlab and Maple.  The program itself takes up over a GB

of drive space, and is to math software much like Csound is to audio synthesis

and DSP.

It's documentation is here:

http://www.sagemath.org/help.html

and the download page is here:

http://www.sagemath.org/download.html

I know of quite a few other open source math  programs, but I think the two

above are the best candidates for computing IIR coeffiecients.

All the Best,

Jim Bates

The subject asks the question... What I want to know is if there's an

easy way using something like pylab and numpy to produce a set of

coefficients for an IIR filter from a given frequency response.

I've read on the internet that matlab has the invresz function which

does this, but is there an easy way with free software?

Cheers

Andr?s

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