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From: sdyer@bbnccv.UUCP (Steve Dyer)
Newsgroups: net.audio
Subject: Re: Are DNR noise reducers sold commercially?
Message-ID: <128@bbnccv.UUCP>
Date: Fri, 8-Mar-85 12:51:50 EST
Article-I.D.: bbnccv.128
Posted: Fri Mar  8 12:51:50 1985
Date-Received: Mon, 11-Mar-85 05:30:09 EST
References: <494@hou2e.UUCP>
Organization: Bolt Beranek and Newman, Cambridge, MA
Lines: 17

I have a Burwen Dynamic Noise Filter which uses, I believe, discrete
devices, unlike National Semiconductor's DNR chip which operates on
the same principles.  I have found that it works very well on many
recordings, although REALLY noisy source material can cause audible
pumping.

Radio Shack is selling a "Video Sound Processor" which incorporates
National's DNR chip (along with a lot of extra gunk like stereo
synthesis).  It might be a cheap (< $100) way to get DNR in your system.

The Burwen unit is apparently still being manufactured and sold by
Infinity (which bought out KLH (which bought out Burwen)).  It lists
for $350 which is a bit steep for non-critical noise-reduction.
-- 
/Steve Dyer
{decvax,linus,ima,ihnp4}!bbncca!sdyer
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