Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!pacbell.com!pacbell!well!moon!ymt!mike
From: mike@ushicom (Puddleglum Marshwiggle)
Newsgroups: comp.ai.neural-nets
Subject: Re: Discrete Frequency Paradox
Keywords: speech, bilogy, help
Message-ID: <1991Mar14.174551.7759@ymt.com>
Date: 14 Mar 91 17:45:51 GMT
References: <1991Mar12.160801.23281@afit.af.mil>
Sender: mike@ymt.com (Puddleglum Marshwiggle)
Reply-To: mike@ushicom (Puddleglum Marshwiggle)
Organization: Yamaha Music Technologies USA, Inc.
Lines: 16



What you've described in refered to as Shepard's Tones, named after
AT&T Bell Labs psychologist Roger Shepard.  The acoustical allusion
he discovered exhibits the proprerty of circular pitch, that is,
it sounds like the pitch is constantly rising, but it never goes
anywhere. It is sometimes refered to as the "barber pole" effect.

You can read about it on pg. 221 of Elements of Computer Music, by
F. Richard Moore, which gives details on how to implement a shepard's
tone generator.  I couldn't find an "original reference".

-- 
Michael Czeiszperger      | Disclaimer: The above posting does not represent 
Yamaha Music Technologies | opinions or policies of Yamaha. 
mike@ymt.com              |