From: Don Pearce
Subject: Re: Acoustic Feedback reduction
Date: Sun, 12 Jan 2003 12:51:42 +0000
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On Sun, 12 Jan 2003 23:33:10 +1100, "Phil Allison"
> 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.
> ................... Phil
First - I am not looking for a fight.
But - the only difference between pitch shifting and frequency
shifting is that in pitch shifting, each frequency is shifted by a
certain percentage of itself, while in frequency shifting each
frequency is shifted by a given number of Hz.
The two are different in one important regard - in pitch shifting the
harmonic relationships are preserved and the result remains musical.
In frequency shifting this does not happen, and if the shift is
carried too far, the result is very unmusical.
Both, however, involve changes in frequency, and as such are of value
in reducing the possibility of feedback, which is at its most
troublesome when frequency is maintained around the feedback loop.