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From: gof@somewhere.invalid (Adam Wysocki)
Newsgroups: comp.arch.embedded,sci.electronics.design
Subject: Re: Tone Deafness
Date: Wed, 28 Aug 2013 18:44:25 +0000 (UTC)
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In comp.arch.embedded Martin Brown <|||newspam|||@nezumi.demon.co.uk> wrote:

> If you count realtime Fourier analysis with additional temporal 
> resolution on transients beyond what classical signal processing permits 
> then yes they are "simple" hardware. In practice it is a lot harder than 
> that and the ear is easily fooled by auditory illusions like the forever 
> rising tone in shades of Escher.
> 
> http://en.wikipedia.org/wiki/Shepard_tone

Here you can find even more examples:

http://listverse.com/2008/02/29/top-10-incredible-sound-illusions/

AW