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From: wbe@bbn.com (Winston Edmond)
Newsgroups: comp.sys.amiga,comp.sys.mac,comp.sys.atari.st,rec.music.makers,rec.music.synth
Subject: Continuously Rising Tone Generators (Was: Sonic Holography.)
Message-ID: <10421@diamond.BBN.COM>
Date: Fri, 4-Dec-87 17:24:52 EST
Article-I.D.: diamond.10421
Posted: Fri Dec  4 17:24:52 1987
Date-Received: Wed, 9-Dec-87 07:00:55 EST
References: <7536@eddie.MIT.EDU> <2476@gryphon.CTS.COM>
Reply-To: wbe@bbn.com (Winston Edmond)
Organization: BBN Laboratories Incorporated, Cambridge, MA
Lines: 9
Summary: Making a sound that keeps rising in pitch
Xref: mnetor comp.sys.amiga:11953 comp.sys.mac:10652 comp.sys.atari.st:6623 rec.music.makers:1164 rec.music.synth:2086

I think the proper name for something that produces a sound that appears to
have an ever-increasing pitch is a continuously-rising tone generator.  To
make one, you create many tones, more or less evenly distributed over the
entire audible frequency range.  As a component tone rises to a frequency
exceeding normal hearing, it is eliminated and replaced by a tone with a
frequency that is below the normal hearing range.  Since one can't hear the
tones being eliminated or added, all one is left with is the impression of
continuously-rising tones.
 -WBE