[PD] [vcf~] and [biquad~] filters

[julien.breval at tremplin-utc.net]

Selon Dan Neveu <neveu at buffalo.edu>:

> Do you have access to the Jimmies lib?
> http://www.ircam.fr/produits/logiciels/log-compl/msp/Jimmies-e.html
> 
> I don't have them myself. I just know there're additional filters provided.

you must belong to the Forum Ircam to get them ...

any other externals, like parameters converters for [biquad~] ? (abstractions, 
etc)



> On Mon, 17 May 2004 julien.breval at tremplin-utc.net wrote:
> 
> > Hello
> > 
> > In June I will participate to a concert in which we all have to use
> Max/MSP. 
> > Therefore I am currently porting some of my Pd patches to MSP, and I have
> some 
> > problems with bandpass filtering.
> > 
> > In Pd, I use [vcf~]. I don't find any MSP filter that has a similar sound.
> 
> > With MSP filters like [svf~], [filtergraph] or [reson~], if you raise Q,
> you 
> > can still hear lots of frequencies that are only more or less attenuated.
> With 
> > [vcf~] some frequencies can disappear if you raise Q (actually, they are
> very 
> > much attenuated so you don't hear them). I prefer this sound.
> > 
> > The right solution sould be to use [biquad~]. MSP-[biquad~] looks like
> Pd-
> > [biquad~] with some arguments inversed. 
> > Unfortunately, besides a paper from Harmony Central I didn't find much 
> > information on it. Do you know any documentation about biquad filters ?
> > 
> > How do you make the simplest (linear) bandpass filter  using [biquad~] 
> > (parameters should be F and Q) ? I don't find any working conversion
> algorithm 
> > from (F,Q) to (bb1, bb2, ff1, ff2, ff3). 
> > I need something that resembles a '^' rather than a -90°rotated-'{', for
> any 
> > (Q,F) parameters  :) 
> > 
> > 
> > Thanks a lot
> > 
> > j
> >  
> > 
> > 
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