[Pd] Pd's biquad

[Charles Henry]

Nice patch.  I like being able to put the poles and zeros somewhere
and then see the impulse response.  That's cool.  I would probably
change the pole radius param so that it gets asymptotically close to 1
without ever touching the unit circle (it took me a little while to
figure out how it works)
Chuck

On 1/29/07, Frank Barknecht <fbar at footils.org> wrote:
> Hallo,
> Chuckk Hubbard hat gesagt: // Chuckk Hubbard wrote:
>
> > On 1/28/07, Frank Barknecht <fbar at footils.org> wrote:
> > >Frank Barknecht hat gesagt: // Frank Barknecht wrote:
> > >
> > >> Actually I've just read a nice, not too mathematical explanation of
> > >> biquad-filters in Perry Cook's book "Real Sound Synthesis for
> > >> Interactive Applications" which I'm currently reading. It's a bit too
> > >> expensive to buy just for the biquad pages, but maybe you can find it
> > >> in a library.
> > >
> > >Uhm, and another one is here:
> > >http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
> >
> > Thanks Frank.  I came across that one a few days ago, still not quite
> > through it yet.  I'll see if our library has Perry Cook.
>
> I just remembered, that Cook is a colleage of Julius O. Smith III and
> recommends JOS for people who want to dig deeper into the math. And
> the good thing is: JOS has a huge amount of texts online.
>
> One about biquads is here:
> http://ccrma.stanford.edu/~jos/filters/BiQuad_Section.html
> then follow the links.
>
> I played around a bit with the [biquad~] today and came up with
> attached patch, which is similar to CH's patch. It's attached.
>
> Ciao
> --
>  Frank Barknecht                 _ ______footils.org_ __goto10.org__
>
>
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