Thanks to all who responded. I got way more leads to the "ever-rising tone" than I ever expected. Steve Gray ----- Original Message ----- From: "George W. Hart" <george@georgehart.com> To: "math-fun" <math-fun@mailman.xmission.com> Sent: Monday, October 27, 2003 6:41 PM Subject: [math-fun] Shepard's tones
Steve Gray wrote:
A few decades ago I visited the A.I. lab at Stanford and Les Earnest showed me around. He demonstrated something he called the "ever-rising tone." It was most impressive. Do you have any idea where I could get a
copy
of it (in almost any form, audio or digital)?
It was probably what is usually called "Shepard's tones" from a 1964 paper by Roger N. Shepard, "Circularity in Judgments of Relative Pitch" Google lists many online versions of it, e.g., http://www.noah.org/science/audio_paradox/
George http://www.georgehart.com/
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