Description

gendyx (gendy eXtended) is an implementation of the Génération Dynamique Stochastique (GENDYN), a dynamic stochastic approach to waveform synthesis conceived by Iannis Xenakis, using curves instead of segments.

Syntax

ares gendyx kamp, kampdist, kdurdist, kadpar, kddpar, kminfreq, kmaxfreq, \
            kampscl, kdurscl, kcurveup, kcurvedown [, initcps] [, knum]

kres gendyx kamp, kampdist, kdurdist, kadpar, kddpar, kminfreq, kmaxfreq, \
            kampscl, kdurscl, kcurveup, kcurvedown [, initcps] [, knum]

Initialization

initcps (optional, default=12) -- max number of control points.

Performance

kamp -- amplitude.

kampdist -- choice of probability distribution for the next perturbation of the amplitude of a control point. The valid distributions are:

If kampdist=6, the user can use an external k-rate signal through kadpar.

kdurdist -- choice of distribution for the perturbation of the current inter control point duration. See kampdist for the valid distributions. If kdurdist=6, the user can use an external k-rate signal through kddpar.

kadpar -- parameter for the kampdist distribution. Should be in the range of 0.0001 to 1.

kddpar -- parameter for the kdurdist distribution. Should be in the range of 0.0001 to 1.

kminfreq -- minimum allowed frequency of oscillation.

kmaxfreq -- maximum allowed frequency of oscillation.

kampscl -- multiplier for the distribution's delta value for amplitude (1.0 is full range).

kdurscl -- multiplier for the distribution's delta value for duration.

kcurveup -- controls the curve for the increasing amplitudes between two points; it has to be non negative.

kcurvedown -- controls the curve for the decreasing amplitudes between two points; it has to be non negative.

knum (optional, default=initcps) -- current number of utilized control points.

The waveform is generated by knum - 1 curves and is repeated in the time. The vertexes (control points) are moved according to a stochastic action and they are limited within the boundaries of a mirror formed by an amplitude barrier and a time barrier.

Extract of a waveform generated with gendyx.

Examples

Here is an example of the gendyx opcode. It uses the file gendyx.csd.

<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-odac     ;;;realtime audio out
;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o oscil.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

instr 1

aout gendyx 0.7, 1, 1, 1, 1, 20, 1000, 0.5, 0.5, 4, 0.13
outs aout, aout

endin
</CsInstruments>
<CsScore>
i1 0 10
e
</CsScore>
</CsoundSynthesizer>

Here is an example of the gendyx opcode with some modulations. It uses the file gendyx-2.csd.

<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-odac     ;;;realtime audio out
;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o oscil.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

instr 1
kenv expseg 0.001, p3*0.05, 0.5, p3*0.9, 0.5, p3*0.05, 0.001
kc1  linseg 1, p3/2, 12, p3/2, 3
kc2  random 0, 4
seed 20120124
asig gendyx kenv, 1, 3, 0.7, 0.8, 120, 4300, 0.2, 0.7, kc1, kc2, 12, kc1
aout dcblock asig
outs aout, aout
endin
</CsInstruments>
<CsScore>
i1 0 20
e
</CsScore>
</CsoundSynthesizer>

References

See Also

gendy gendyc

Credits

New in Csound version 5.16