owner-csound-outgoing wrote
>From owner-csound-outgoing Tue Oct 14 20:06:15 1997
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Date: Tue, 14 Oct 97 20:06:15 GMT
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To: owner-csound-outgoing
Subject: BOUNCE Csound: Non-member submission from [rasmus ekman ]

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From: rasmus ekman 
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To: csound
Subject: Re: Shepard tones
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Hi, 

ACCCID (amsterdam examples) has three examples of Shepard
notes with good explanations. See \02\02_44_*.* 
All are based on an instrument by Risset. It's also in the 
common Csound collection, viz Endless.* and risset4.* 

When I first heard of this, the teacher mentioned using
some bell shape for amplitude as if this was integral to
the proper effect. And so it seems; a formula in Risset's 
original instrument is given as:
   exp(-4.8283*(1-cos(2*pi*(x-255.5)/511)))
This is generated separately by an orchestra in the
ACCCID example.

Those who don't have the ACCCI collection should definitely 
get it from
   http://mars.let.uva.nl/gather/accci/download.html


cheers,

	re


-- 
James Andrews, maths CDO, ext.3977