[PD] Re: PD-list digest, Vol 1 #1841 - 14 msgs

Chris McCormick chris at mccormick.cx
Tue Mar 22 01:33:33 CET 2005

> Date: Mon, 21 Mar 2005 15:15:57 +0100
> To: "matthew jones" <mj at isvr.soton.ac.uk>, "PD-List" <pd-list at iem.kug.ac.at>
> From: sven <ml.sven at subscience.de>
> Subject: Re: [PD] feedback control
> At 13:48 21.03.2005, matthew jones wrote:
> >>if so multiply that bands which an adjustable value <1
> >
> >but wouldn't that have weird effects when the signal you are attempting to
> >remove the feedback from is the sound of you whistling??
> >Or is this method the one that many feedback supressors use?  I thought it
> >was something like mimicking the effect of constantly moving the mic around
> >so that the frequencies at which the system is unstable actually move
> >around, done via slow variable delays or something like that.  Thats just a
> >guess though.
> well, ofcourse a feedback suppressor would effect the sound. just as any 
> noise/click or
> whatever suppressor also filters some of the wanted sound.

Perhaps I'm smoking crack, but I seem to remember from the music-dsp
list that you can just drop the pitch of the input sound a few Hertz
to get rid of feedback. In a digital system this is easily accomplished
by lowering the sample rate slightly right after sampling.

Let's hope i'm not spreading lies and dissemination.

Best regards,


chris at mccormick.cx

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