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Subject: Re: Acoustic Feedback reduction
Organization: Nobody nowhere
X-Newsreader: Microsoft Outlook Express 6.00.2720.3000
Date: Fri, 10 Jan 2003 19:30:15 -0000
NNTP-Posting-Date: Fri, 10 Jan 2003 19:30:20 GMT
"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 use a
graphic equalizer. The method is to turn the volume up until the feedback
occurs, and turn down the appropriate frequency slider on the graphic until
the feedback disappears. And repeat until the desired volume level is
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