[PD] [bp~] really equal to [vcf~]?

[Alexandre Torres Porres]

Hi Miller, still trying to get my head around this. But anyway, one thing I
have to note is that the source code of [vcf~] says it is a "two pole
filter", not a "one complex pole" filter.

Should that description be changed? If not, why?

thanks


2014-04-12 14:13 GMT-03:00 Miller Puckette <msp at ucsd.edu>:

> Yep - vcf~ is essentially a wrapper for cpole~.
>
> cheers
> M
>
> On Sat, Apr 12, 2014 at 02:10:19PM -0300, Alexandre Torres Porres wrote:
> > that's great to know, thanks!
> >
> > Let me just see if I get a bit of the theory. Can I get [vcf~] with just
> > one [cpole~] object and the right coeficients?
> >
> > Cheers
> >
> >
> > 2014-04-12 13:36 GMT-03:00 Miller Puckette <msp at ucsd.edu>:
> >
> > > They're quite different.  bp~ is the cheapest possible bandpass filter
> > > (as far as I know).  vcf~ is a one-pole complex filter whose outputs
> are
> > > the real and imaginry parts.  The real part may be used as a resonant
> > > bandpass filter and the imaginary as a resonant low-pass filter, but
> > > they can be combined to make other possibilities.
> > >
> > > It's possible to graph their frequency responses using the help patch
> > > "H10.measurement.pd' in 3.audio.examples.
> > >
> > > cheers
> > > Miller
> > >
> > > On Sat, Apr 12, 2014 at 04:28:11AM -0300, Alexandre Torres Porres
> wrote:
> > > > Hi there, who can confirm that both [bp~] and [vcf~] are exactly the
> > > really
> > > > same thingy? The code looks quite different...
> > > >
> > > > Moreover, why the two outlets for vcf~? Help doesn't say anything.
> > > >
> > > > Thanks
> > >
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