Path: utzoo!news-server.csri.toronto.edu!rutgers!ukma!rex!georgiou
From: georgiou@rex.cs.tulane.edu (George Georgiou)
Newsgroups: comp.ai.neural-nets
Subject: Re: Discrete Frequency Paradox
Keywords: speech, bilogy, help
Message-ID: <6649@rex.cs.tulane.edu>
Date: 13 Mar 91 06:41:56 GMT
References: <1991Mar12.160801.23281@afit.af.mil>
Organization: Computer Science Dept., Tulane Univ., New Orleans, LA
Lines: 23

In article <1991Mar12.160801.23281@afit.af.mil> gtarr@afit.af.mil (Vax Headrm) writes:
>Can someone please help me find a reference to or an
>individual who know anything about something called
>the discrete frequency paradox.  Its supposed to be one
>of the few audio illusions.  When played it sounds like a
>continually increasing frequency, but just goes on more or
>less forever.  I think the guy who first wrote about it
>is named sheppard, but I'm not sure.  Please help,
>either post or send response to gtarr@blackbird.afit.af.mil.

The reference you are looking for is:

Shepard, Roger N. "Circularity judgments in relative pitch", Journal
of the acoustical Society of America 36, Dec. 1964, pp. 2346-2353

Also,

pp. 717-719, "Godel, Escher, Bach" by Douglas Hofstadter.

George Georgiou                       georgiou@rex.cs.tulane.edu
Computer Science Department           +---------------------------+
Tulane University                     |       Fiat Lux            |
New Orleans, LA 70118                 +---------------------------+