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From: collinge@uvicctr.UUCP
Newsgroups: sci.electronics
Subject: Re: 3800 Hz notch filter [will] be used on CD masters
Message-ID: <268@uvicctr.UUCP>
Date: Mon, 6-Jul-87 15:14:37 EDT
Article-I.D.: uvicctr.268
Posted: Mon Jul  6 15:14:37 1987
Date-Received: Thu, 9-Jul-87 06:32:49 EDT
References: <598@neoucom.UUCP> <67@sdeggo.UUCP> <1597@ihuxi.ATT.COM> <921@argus.UUCP> <1002@speech1.cs.cmu.edu>
Reply-To: collinge@uvicctr.UUCP (Doug Collinge)
Organization: University of Victoria, Victoria B.C. Canada
Lines: 21

In article <1002@speech1.cs.cmu.edu> phd@speech1.cs.cmu.edu (Paul Dietz) writes:
>I hate to disagree with CBS, but "normal" music certainly has interesting
>things happening around 3800 Hz!
>Ken brings up an interesting point. In order to trick the spoiler, he
>suggests filling the hole. What if instead of just filling the hole, we
>fill it proportional to the energy in the two adjacent bands?

I suggest that, since 3800 Hz energy in music will be mostly harmonics of
lower frequency tones,  the thing to do is to put the music through a
fuzzbox then filter out the 3800 Hz energy of the generated harmonics and
intermodulation products.  This has the advantage of correlating the 
synthetic stuff with the music that is already present - something the ear
is extremely sensitive to.
-- 
		Doug Collinge
		School of Music, University of Victoria,
		PO Box 1700, Victoria, B.C.,
		Canada,  V8W 2Y2  
		collinge@uvunix.BITNET
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