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From: ISW@cup.portal.com (Isaac S Wingfield)
Newsgroups: sci.electronics
Subject: Re: Nice DSP problem.
Message-ID: <14747@cup.portal.com>
Date: 17 Feb 89 21:21:59 GMT
References: <4104@cs.Buffalo.EDU> <1822@mit-caf.MIT.EDU> <617@uvicctr.UUCP>
Distribution: usa
Organization: The Portal System (TM)
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<how to amplify sound in a room without feedback>

An oold technique is to modulate the audio SSB-wise, and then
demodulate it with a slightly different carrier freq. The result
is that what comes out is a different frequency than what went in, 
and if I remember right, it can give you around 10dB more volume
before fedback sets in.

Isaac     isw@cup.portal.com