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From: "Phil Allison"
Subject: Re: Acoustic Feedback reduction
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sat, 11 Jan 2003 14:13:51 +1100
NNTP-Posting-Date: Sat, 11 Jan 2003 14:03:24 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Walter Harley" wrote in message
> "Nico Coesel" wrote in message
> > There is another way though developed by someone named Larssen. He
> > came up with a system that shifts all frequencies by a few Hertz.
> ...a technique which I certainly hope would be applied only to spoken
> and not to music. Harmonic relationships don't hold up when
** Yes they do - long as the shift is not too much.
> In the music reinforcement business, the typical technique these days is
> use dynamically-tuned notch filters (much narrower than a graphic EQ), to
> notch out the particular frequency of the problem. Sabine, Behringer,
> make these.
** These units affect the sound quality MUCH more than a +4 Hz shift.
They can only notch a handfull of different frequencies. A frequency
shifter can kill up to 2000 simultaneously with no change in tonal quaility,
no set up and no need to alter settings for room full or empty.
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