[LAD] A short technote on digital state-variable filters

Will J Godfrey WillGodfrey at musically.me.uk
Fri Nov 20 19:50:18 CET 2020

On Thu, 19 Nov 2020 22:05:00 +0100
Fons Adriaensen <fons at linuxaudio.org> wrote:

>Hello all,
>Some people have asked me to provide a bit more documentation
>on the state-variable filters I used in zita-eq1 and zita-jacktools.
>So I've written a short technical note on this. You can find it at

Thanks for this. Very interesting. I recognised the hardware drawing instantly.
I used a variant on an amp some years ago for splitting out sub-bass, just
using the high and low pass outputs. It made tuning to suit the actual speakers
extremely easy.

It wasn't me! (Well actually, it probably was)

... the hard part is not dodging what life throws at you,
but trying to catch the good bits.

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