The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "Phil Allison"
Subject: Re: Acoustic Feedback reduction
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sat, 11 Jan 2003 14:08:39 +1100
NNTP-Posting-Date: Sat, 11 Jan 2003 13:58:13 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Nico Coesel" wrote in message
> "g0mem" wrote:
> >"Spehro Pefhany" wrote in message
> >> Many years ago in good old _Wireless World_ (long before "wireless"
> >> acquired its present meaning(s)) there was a design published for a
> >> device used to allow higher volume levels in PA systems before
> >> feedback occurred (with a given microphone). IIRC, they used
> >> one or two multipliers in a circuit that shifted the audio pitch by
> >> around 10Hz.
> >> Has this sort of thing been integrated into a single chip?
> >I never come accross that method before but there is no reason why it
> >shouln't work. Another technique to cure feedback on a PA system is to
> >graphic equalizer. The method is to turn the volume up until the feedback
> >occurs, and turn down the appropriate frequency slider on the graphic
> >the feedback disappears. And repeat until the desired volume level is
> This is really not the way to do it. You'll only make it worse because
> it will get more difficult to hear what is said through the PA.
> There is another way though developed by someone named Larssen. He
> came up with a system that shifts all frequencies by a few Hertz.
** Yep, that is called "frequency shifting" as opposed to pitch shifting
which is quite different.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup