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From: rab@well.UUCP (Bob Bickford)
Newsgroups: net.med,net.info-terms,net.audio
Subject: Re: "Ultrasonic" hearing
Message-ID: <475@well.UUCP>
Date: Sun, 12-Jan-86 07:27:39 EST
Article-I.D.: well.475
Posted: Sun Jan 12 07:27:39 1986
Date-Received: Tue, 14-Jan-86 04:20:54 EST
References: <1280@brl-tgr.ARPA> <590@harvard.UUCP> <11370@ucbvax.BERKELEY.EDU> <251@birtch.UUCP>
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Xref: watmath net.med:3122 net.info-terms:795 net.audio:7113
Summary: Hearing range

In article <251@birtch.UUCP>, oleg@birtch.UUCP (Oleg Kiselev) writes 
about people being annoyed by the squeal put out by monitors and tv sets.
(BTW, it is [usually] the mechanical vibration induced in the flyback
transformer at 15,750 Hertz [B/W] which is audible.)

Then the discussion turned to Ultrasonic hearing.

On this subject, I used to work installing so-called "ultrasonic"
alarm systems and several times complained to my boss that I could
hear them (and they were giving me headaches).  I finally convinced
him by doing a complete install and alignment of a system without
the usual test equipment, in a difficult location.  I still (even
after several years of rock 'n' roll) have hearing up to around 20kHz.
(the alarms were between 25 and 40 kiloHertz)  (I'm 27)

	Robert Bickford     (rab@well.uucp)
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    I doubt if these are even my own opinions.
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