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Subject: Re: Acoustic Feedback reduction
Organization: Nobody nowhere
X-Newsreader: Microsoft Outlook Express 6.00.2720.3000
Date: Sat, 11 Jan 2003 08:41:40 -0000
NNTP-Posting-Date: Sat, 11 Jan 2003 08:41:46 GMT
"Phil Allison" wrote in message
> "Walter Harley" wrote in message
> > "Nico Coesel" wrote in message
> > news:email@example.com...
> > > 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
> > frequency-shifted.
> ** 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),
> > 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
> no set up and no need to alter settings for room full or empty.
It would cetainly be noticable with miked up acoustic instruments, e.g. a
piano. People would here the piano itself and the piano +4Hz sharp coming
out of the PA system, it would sound horrible. As Walter pointed out they
notch out the offending feedback frequencies. by a couple of dB. Which has
much less affect on the tonal quality than listening to an instrument that's
SHARP or FLAT.
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