[PD] No "voltage-controlled" lowpass filter?

cyrille henry ch at chnry.net
Fri Feb 19 00:52:46 CET 2010


there is a lot of discussion about filter in this list.

if you wish to build filter with vanilla object, you can build yours with pole~ and zero~ objects.

you can also use biquad~ object.

you can also use expr~ to make an equivalent of my bq~ object and use my abstraction to compute coeficients.

and there is certainly lot's of other possibility with pure vanilla pd...

and lot's more with externals...


Matteo Sisti Sette a écrit :
> Hi,
> Is vcf~ (which is bandpass) the only available type of signal-controlled 
> (smoothly-changing) filter? Doesn't the "voltage-controlled" version of 
> lop~ and hip~ exist? Is it for a "mathematical" reason? (i.e. 
> impossibility to implement in a relatively simple way)
> Or is it because it is trivial to "build" it in PD? If so, how?
> And if not, how would you "approximate" it, that is create in PD 
> something similar to a simple low-pass filter whose cutoff frequency is 
> controlled by a signal?
> thanks
> m.
> P.S. of course I'm talking about PD Vanilla...

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