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From: collinge@uvicctr.UUCP (Doug Collinge)
Newsgroups: sci.electronics
Subject: Re: 3800 Hz notch filter [will] be used on CD masters
Message-ID: <270@uvicctr.UUCP>
Date: Sat, 11-Jul-87 18:13:02 EDT
Article-I.D.: uvicctr.270
Posted: Sat Jul 11 18:13:02 1987
Date-Received: Thu, 16-Jul-87 03:30:04 EDT
References: <598@neoucom.UUCP> <67@sdeggo.UUCP> <1597@ihuxi.ATT.COM> <268@uvicctr.UUCP> <1003@speech1.cs.cmu.edu>
Reply-To: collinge@uvicctr.UUCP (Doug Collinge)
Organization: University of Victoria, Victoria B.C. Canada
Lines: 37

In article <1003@speech1.cs.cmu.edu> phd@speech1.cs.cmu.edu (Paul Dietz) writes:
>This is a very interesting proposal! It is based upon the assumption that
>most instruments generate harmonic partials in a fairly smooth fashion.
>This is quite reasonable for certain instruments, for instance, the
>brasses. However, some instruments have enharmonic partials (bells
>come to mind), and some have very pronounced gaps (like the clarinet)
>which give rise to the characteristic timbre. These might sound a little
>strange when a hole that was there before suddenly gets filled when
>running up a scale.
Most real instruments change the shape of their spectrum for every note -
since we are talking about probably only one partial no-one is likely to
notice much.  I think you would probably have to watch the amplitude of this
synthetic partial but a little compromising given the average nature of
musical sounds would probably do it.

On the other hand:  
>I doubt most people will be able to notice the
>difference without an A/B comparison anyway!)
I have to agree with you but we'll wait for the blind tests.  Does anyone
know what the proposed bandwidth of this notch is? 
>
>I don't really know what a fuzzbox does (feel free to send me mail...),
>but I assume it's some sort of time invariant, non-linearity. 
Exactly, used for increasing the brilliance and sustain of electric guitar
sounds.  

>(i.e. a comparator) 
Yes, typically, plus filters and various junk according to taste.

-- 
		Doug Collinge
		School of Music, University of Victoria,
		PO Box 1700, Victoria, B.C.,
		Canada,  V8W 2Y2  
		collinge@uvunix.BITNET
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