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From: crandell@ut-sally.UUCP (Jim Crandell)
Newsgroups: net.audio
Subject: Re: Yet another speaker anomaly
Message-ID: <1621@ut-sally.UUCP>
Date: Tue, 16-Apr-85 12:38:17 EST
Article-I.D.: ut-sally.1621
Posted: Tue Apr 16 12:38:17 1985
Date-Received: Wed, 17-Apr-85 06:00:54 EST
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Distribution: net
Organization: U. Texas CS Dept., Austin, Texas
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> Here's another speaker anomaly: Doppler shift. A single speaker cone
> attempting to reproduce a loud, low tone and a quieter, higher-pitched
> tone simultaneously will end up frequency-modulating the high tone with
> the low tone. This happens because the large cone excursions caused by
> the low frequency tone give the cone enough velocity to audibly shift
> the apparent frequency of the high-pitched tone as it is emitted by
> the cone. I read about this some years ago and it seems reasonable,
> although I've never knowingly heard it. Any comments?
> 
It's true.  It's the basis of a classical (should I say ancient?) argument
against whizzer cones.  (Am I the only one around who remembers that one?)
-- 

    Jim Crandell, C. S. Dept., The University of Texas at Austin
               {ihnp4,seismo,ctvax}!ut-sally!crandell