[PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

Funs Seelen funsseelen at gmail.com
Mon Sep 23 11:10:42 CEST 2013

Hi Alexandre,

Great that you're doing this! For extra inspiration you could have a look
at PoZeTools (http://kmt.hku.nl/~pieter/SOFT/RESP/html/PoZeTools.html).
It's great software by Pieter Suurmond. He's the one who taught me filter
design and he probably has some info about Z-transform on his website as


On Mon, Sep 23, 2013 at 7:37 AM, Alexandre Torres Porres
<porres at gmail.com>wrote:

> Hi there. So, I've been studying a lot about filters, and I'm doing this
> clone of max's z-plane in Pd.
> I hope anyone can help me guide where to find how to convert the values of
> the complex poles and zeros to biquad coefficients. I really needed that...
> Sorry if I missed it in Miller's book or some other obvious reference, I'm
> just really a newbie in filter design.
> Thanks
> Alex
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