From: "Frank Bemelman"
Subject: Re: Acoustic Feedback reduction
Date: Fri, 10 Jan 2003 21:45:25 +0100
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Organization: EuroNet Internet
NNTP-Posting-Date: 10 Jan 2003 20:45:31 GMT
"Walter Harley" schreef in bericht
> "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
> 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.
I've heard of another technique that samples the audio, plays it back
at a slightly reduced rate, and skips portions once the delay gets
larger than a few ms. The skipping/glueing better be done at zerocrossings.
The most effective way to attack this problem is (imo) using a good
microphone, with good direction characteristics. Or this should be
at least the first thing to take care of.
(remove 'x' & .invalid when sending email)