[PD] butterworth/chebyshev/etc in biquad?

Frank Barknecht fbar at footils.org
Mon Dec 15 16:59:39 CET 2014


On Mon, Dec 15, 2014 at 03:41:45PM +0000, Claude Heiland-Allen wrote:
> On 15/12/14 14:49, Alexandre Torres Porres wrote:
> >Do any of you know if they're Butterworth or what?
> I'm not sure how much difference it makes for low-order filters
> (biquad has 2 poles and 2 zeros).  The differences really matter
> more for higher order filters, say 8 poles or more...
> You could waste time calculating coefficients for a biquad cascade
> (the process is quite involved - see the mkfilter package online),
> but I'd just use the ones already made in iemlib...

There's also a 3rd order BW in the docs, if you're interested in the inner
workings: 3.audio.examples/H13.butterworth.pd

 Frank Barknecht                                     _ ______footils.org__

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