Hi Andres,
As far as free software comparable to matlab for the design of iir filters,
there are several possibilities.
SciLab is one, and its manual has several sets of toolboxes for iir filter design.
It is pretty much cross platform, but the latest version on OSX only runs on Intel,
not on PPC. Earlier versions of SciLab (ie vers. 4) are rather limited compared
to the current version.
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:
and the download page is here:
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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