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From: "Phil Allison"
Subject: Re: Acoustic Feedback reduction
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sun, 12 Jan 2003 23:33:10 +1100
NNTP-Posting-Date: Sun, 12 Jan 2003 23:22:29 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"John Woodgate" wrote in message
> I read in sci.electronics.design that Phil Allison
> wrote (in ) about 'Acoustic
> Feedback reduction', on Sun, 12 Jan 2003:
> >You have NOT even tried frequency shifting -
> >it is entirely different to pitch shifting.
> I don't understand that, Phil.
** That is almost unbelievable - but with John ........
Low cost DSP "pitch shifters" have been on wide sale for 15 years or
While there is not an exact relationship
> between frequency and pitch, I can't believe that is what you are
> referring to. I don't think you need to define 'frequency shifting' but
> what is 'pitch shifting'? Electronic transposition, i.e. changing the
> key of a piece from, say, C to G? I suppose that is possible with DSP,
> but I didn't know that anyone was doing it.
** Oh dear. John - where have you been ??
Pitch shifting is included on nearly every digital audio multi
effects unit - often adjustable in cents or at least semitones and over a
range of one or more octaves. Yamaha make the SPX series with it included
but there are dozens of others.
The number of persons I have had to FIGHT with over this simple
terminology issue is appalling - they all think that frequency and pitch
mean the same thing.
Pitch shifting is of course of NO use in feedback supression.
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