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From: dyer@harvard.UUCP (Steve Dyer)
Newsgroups: net.med,net.info-terms,net.audio
Subject: Re: "Ultrasonic" hearing
Message-ID: <590@harvard.UUCP>
Date: Tue, 7-Jan-86 00:06:14 EST
Article-I.D.: harvard.590
Posted: Tue Jan  7 00:06:14 1986
Date-Received: Wed, 8-Jan-86 20:03:44 EST
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Organization: Aiken Comp Lab, Harvard
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Xref: linus net.med:2928 net.info-terms:328 net.audio:6409

I don't know anything about so-called "Ultrasonic" hearing, but
I do know that the flyback transformers on most monitors emit a
buzz around 17-19 khz; the exact frequency escapes me right now.  
This is "ultrasonic" only for most people over 30 or 35 years of age.
I can hear it, and I have several friends who can hear it.  It
doesn't bother me, but this does seem to be a point of contention for
audiophiles who feel pushed headlong into a shotgun marriage of audio
and video, since they claim that the sound of the monitor is especially
disturbing during music, and makes any pretense to otherwise low
distortion and noise figures quite silly.

For example, the Pioneer CD/LaserDisc player has its programming
display on the video monitor, eschewing low-tech LEDs.
-- 
/Steve Dyer
dyer@harvard.harvard.edu
harvard!dyer