Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!bbn!diamond.bbn.com!wbe 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