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Date: Fri, 10 Jan 2003 21:07:40 +0000
From: Mike Page
User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0
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Subject: Re: Acoustic Feedback reduction
NNTP-Posting-Date: Fri, 10 Jan 2003 21:07:23 +0000
Spehro Pefhany wrote:
>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
>Has this sort of thing been integrated into a single chip?
Maybe you could find some cheap effects chip - the kind fitted in kids'
karaokes, but the quality won't be great. I wonder what the intercom /
handsfree / conference-phone people do. Things seem to have progressed
from the unsatisfactory half duplex affairs. In fact, I do remember
getting a glossy for a chip for this kind of application from a
mainstream supplier like Texas, Analog, Maxim; just can't remember who.
Keep searching !
Mike Page email@example.com
BEng(Hons) MIEE www.eclectic-web.co.uk
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