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From: larry@kitty.UUCP (Larry Lippman)
Newsgroups: net.med,net.info-terms,net.audio
Subject: Re: Re: "Ultrasonic" hearing
Message-ID: <701@kitty.UUCP>
Date: Sun, 12-Jan-86 11:09:02 EST
Article-I.D.: kitty.701
Posted: Sun Jan 12 11:09:02 1986
Date-Received: Fri, 17-Jan-86 00:47:32 EST
References: <1280@brl-tgr.ARPA> <590@harvard.UUCP>
Distribution: net
Organization: Recognition Research Corp., Clarence, NY
Lines: 16
Xref: watmath net.med:3133 net.info-terms:800 net.audio:7145

> 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.

	The frequency is 15,750 Hz - which is not that high, and is not
`ultrasonic'.  Whether or not you hear the flyback on a given monitor is
a poor indication of your hearing ability, since better quality flybacks
produce very little audio energy.

==>  Larry Lippman @ Recognition Research Corp., Clarence, New York        <==
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