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From: spp@ucbvax.BERKELEY.EDU (Stephen P Pope)
Newsgroups: net.med,net.info-terms,net.audio
Subject: Re: "Ultrasonic" hearing
Message-ID: <11370@ucbvax.BERKELEY.EDU>
Date: Tue, 7-Jan-86 12:10:22 EST
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Posted: Tue Jan  7 12:10:22 1986
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     I've never encountered a TV receiver or monitor that
didn't emit an annoying high pitched squeal at at least a
low audible level.  I don't know (or care) whether this is
15.75, 17 or 19 KHz ( the three numbers people usually 
throw out).  I suspect it is there because the receivers
are not built real well.  A real solid frame and chassis would
almost certainly help.  
     On a related subject, I understand that some native
tribes in quiet, undeveloped third-world areas have been
found to be able to hear well up to 40 or 50 KHz.  Apparently,
the average westerner can hear only up to 12 to 20 Khz
mostly because of exposure to noise all his life.

steve