Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1exp 11/4/83; site ihldt.UUCP
Path: utzoo!linus!philabs!seismo!harpo!eagle!mhuxl!ihnp4!ihldt!dbg
From: dbg@ihldt.UUCP
Newsgroups: net.audio
Subject: ultra-sonics
Message-ID: <2155@ihldt.UUCP>
Date: Fri, 16-Dec-83 13:31:15 EST
Article-I.D.: ihldt.2155
Posted: Fri Dec 16 13:31:15 1983
Date-Received: Sat, 17-Dec-83 07:46:24 EST
Organization: AT&T Bell Labs, Naperville, Il
Lines: 7


Considerable air molecule vibration at frequencies above
our normal hearing spectrum occurs every day all around
us.  What's the big deal about ultrasonics?  Musical 
intsruments produce it, jangling car keys produce it,
even the occasional belch probably produces some. So what?