Nobody seems to have answered this one, at least not to the list:

----------
> De: Scott Lipscomb 
> Asunto: psychoacoustic demonstrations
> Fecha: jueves 22 de octubre de 1998 18:26
 
> I am attempting to find a repository of sound
> files (public domain) that provide aural demonstrations of some of the
> more common auditory illusions (e.g., pitch circularity as demonstrated
> in the Shepard Scale [Shepard, 1964], Risset's gliding tone that
> illustrates the same concept, etc.) and other related psychoacoustic
> phenomena.  Is there a collection of orchs & scores anywhere in
> existence that would contain some of these materials? either in sound
> file format or in orch/score combinations?

I don't know of any sites in the Internet with audio files demonstrating
paradoxical sounds; I haven't searched though, maybe there _is_ something
somewhere out there.

The sound examples you're looking for can be found in:

1) vol. 12/13 (double volume) of the Computer Music Currents series
(Wergo, available at the Electronic Music Foundation). This volume is
about the origins of digital synthesis, and includes many examples of
Risset's 1969 catalog. The thick booklet gives code in Music V language,
not so difficult to translate to Csound (refer to the Music V Manual in
The Technology of Computer Music, Mathews et al., MIT Press)

2) the accompanying CD to the book Current Directions in Computer Music
Research, Mathews and Pierce, eds. MIT Press. (also at the EMF). The
article in the book also includes Music V code.

If you're looking for ready-made Csound orc/sco pairs, the Amsterdam
catalog has some pitch paradoxes: see 02_44_1, 02_44_2, and 02_44_2b. 
They are based in Risset's examples in the catalog. For the amplitude
envelope of the partials a table is used reading a soundfile with a
bell-shaped function, but one cycle of a sine function starting at 270
degrees will do. Simply delete -or comment out- the following line in
the scores:
f71  0  513  1  "Sflib/88_01_1.TAB" 0 0 0   

and substitute with:
f71	0	1025	19	1	.5	270	.5

Russell Pinkston also coded Risset's endless glissando in a orc/sco pair
called "endless"; you must do the same table substitution.

A crude approximation to the ever accelerating pulse can be implemented
with a simple fof:

ORC ===================================

sr	=	44100
kr	=	4410
ksmps	=	10

instr 1

koct	linseg	0, p3*.35, .5, p3*.65, 1
kcps	line	p4/60, p3, p4/30
a1	fof	20000, kcps, 600, koct, 60, .01, .3, .01, 20, 1, 2, p3	

out	a1

endin


SCO ===================================
f1	0	8192	10	1	
f2	0	4096	19	.5	.5	270	.5

; p4 = initial metronome (beats per minute)

i1	0	11.63	100
i1	+
i1	+
e



I'm sure the Csound experts in the list can give more elegant and
effective examples of this. I hope this covers some of your needs. 


 

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luis jure 
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