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From: Ian Du Rieu
Subject: Re: Acoustic Feedback reduction
Organization: The Leon Audio Co.
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Date: Thu, 16 Jan 2003 12:48:58 +1030
NNTP-Posting-Date: Thu, 16 Jan 2003 13:17:39 EST
In reality frequency shifters are only good for the spoken word.
Useless for anything involving music.
One toy much better than a frequency shifter is a pitch shifter.
It gives the same percentage shift per octave. Works mutch better.
Shifts in the range of 5 to 20 cents (1/100th of an octave) give good
The easiest way to generate it is with an audio Fx processor.
Yamaha SPX90 is an example of an old model that should be able to be
picked up seconhand for a song.
On Thu, 16 Jan 2003 00:55:00 GMT, Chuck Simmons
>Phil Allison wrote:
>> "Chuck Simmons" wrote in message news:
>> Using the frequency shifter will make almost all intervals
>> > dissonant.
>> ** Says another hypothetitician who has never heard one in use.
>I must count myself very fortunate. I say this from experience playing
>and from tuning pianos and harpsichords. The errors you introduce with
>frequency shifting by a fixed frequency are impossibly out of the
>tolerable range. Try tuning every note on a piano low by even 1Hz and it
>sounds terrible. Almost all harmonies are broken. You seem to be a bit
>atavistic. Even the ancient Greeks more than 2000 years ago had a grasp
>of basic harmony and understood intervals in music (they knew the modes
>we use today though we mainly retain only the major and minor modes).
>Modes, BTW, are all of the unique 8 tone scales that can be played using
>only the white keys of the piano - we mainly use only two.
Ian Du Rieu
The Leon Audio Co
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