hello Roman,

it's a nice filter.


here is a butterworth low pass filter that came with exemple H13.
i just change expr to expr~ to allow an audio control of the cutoff frequency.


cyrille


Roman Haefeli a écrit :
hi cyrille

i am glad to hear that someone has similar thoughts. i would love to
have some filter abstractions based on pd's built-in elementary filters.
however, my understanding is far too limited to create them myself.
i once ported and adapted a peakfilter from millers examples into pdmtl
abs (are they now part of pd-extended, actually?). it is called
[fx.filter.peak.sig~]

the sig stands for audio frequency inlet and audio q inlet. especially
modulating the q parameter with a signal is fun.
to hear it in action (besides a lot of other modulations):
http://www.netpd.org/sessions/2007-08-17_nordatlantik.mp3

roman



On Fri, 2007-11-23 at 20:54 +0100, cyrille henry wrote:
hello,

i know there is a lot's of filter externals available for pd, but i'd like to 
use some using rpole~ / cpole~ etc.
my main motiviations are : 1) i don't like using externals
2) this object allow an audio control of the cutoff frequency

as there is not a lot's of exemples, i'd like to know if anyone used this 
objects to make good filter abstraction.
or anyone have references in order to disign filter?
(i'm looking for a low pass resonant filter by exemple)


thanks
Cyrille



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