[chuck-users] Filters and filter education

Julius Smith jos at ccrma.stanford.edu
Thu May 22 18:42:02 EDT 2014

I like to think of phasing as an approximation to and generalization 
of flanging, which is easier to understand.  In both cases you are 
basically mixing two copies of the input signal where one copy is 
delayed relative to the other.  This relative delay causes 
cancellation ("notches") at frequencies where the two signals are out 
of phase.

- Julius

At 02:55 AM 5/22/2014, Stuart McDonald wrote:
>I've been periodically fussing over trying to construct a phaser (the
>effect, not the fictional weapon) and while there's a working ChucKian
>example at http://electro-music.com/forum/viewtopic.php?t=23264 , I'd
>like to understand more about what's going on.
>The example uses a PoleZero filter, which may as well be called
>PixieWand for all I know what it actually does. There are numerous
>other filter UGens as well; I think there may be a whole world of
>filtration out there I can't even imagine.
>The ChucK documentation doesn't provide descriptions of the mechanics
>of these filters. I get the impression that they're things you're
>expected to understand if you have a formal background in DSP, and if
>you don't, well, it's a bit of a leap to get there.
>For now I'm optimistic I can get educated in some way. A 2006 post on
>this subject on this list
>suggested reading Real Sound Synthesis for Interactive Applications
>by Perry R. Cook.
>The book looks promising, but I'm not sure if it tackles the subject
>to a depth that would be helpful. Has anyone read it and could
>recommend? Perry, what do you reckon? =D
>Many thanks,
>chuck-users mailing list
>chuck-users at lists.cs.princeton.edu

Julius O. Smith III <jos at ccrma.stanford.edu>
Professor of Music and, by courtesy, Electrical Engineering
CCRMA, Stanford University
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