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From: John Woodgate
Subject: Re: Acoustic Feedback reduction
Date: Tue, 14 Jan 2003 22:53:18 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Wed, 15 Jan 2003 08:01:18 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Gibbo
wrote (in <firstname.lastname@example.org>) about 'Acoustic
Feedback reduction', on Tue, 14 Jan 2003:
>Absolutely *but* if A=440 then its first octave harmonic = 880Hz. If A=441
>(still perfectly acceptable) then its 1st octave harmonic = 882Hz. If we now
>shift the whole thing up by 5Hz then A=446 Hz (still fine by my ear) but its
>first octave harmonic is now at 887Hz which sounds absolutely shite.
Well, does it, in fact? The overtones of a string are NOT exact
harmonics, but I think pianos sound pretty good. 887 Hz is about an
eighth of a semitone flat. I don't think many people would be upset by
>effect becomes worse as we get lower down the musical scale. A low E on a
>double bass will be roughtly a full tone sharp yet it's octave harmonic will be
>a semitone sharp.
I agree that the effect is worse at low frequencies. I like 64 ft organ
notes, 16 Hz -> 21 Hz!
> Despite Mr Wombat's assertions to the contrary. He's
>obviously not a musician (or just a very bad one).
Don't be misled by the poetical language. He usually does know what he's
talking about, but sometimes could write more clearly. But that applies
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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