gaussi

gaussi — Gaussian distribution random number generator with interpolation.

Description

Gaussian distribution random number generator with controlled interpolation between values. This is an x-class noise generator.

Syntax

ares gaussi krange, xamp, xcps
ires gaussi krange, xamp, xcps
kres gaussi krange, xamp, xcps

Performance

krange -- the range of the random numbers (-krange to +krange). Outputs both positive and negative numbers.

gauss returns random numbers following a normal distribution centered around 0.0 (mu = 0.0) with a variance (sigma) of krange / 3.83. Thus more than 99.99% of the random values generated are in the range -krange to +krange. If a mean value different of 0.0 is desired, this mean value has to be added to the generated numbers (see example below).

For more detailed explanation of these distributions, see:

  1. C. Dodge - T.A. Jerse 1985. Computer music. Schirmer books. pp.265 - 286

  2. D. Lorrain. A panoply of stochastic cannons. In C. Roads, ed. 1989. Music machine . Cambridge, Massachusetts: MIT press, pp. 351 - 379.

xamp -- range over which random numbers are distributed.

xcps -- the frequency which new random numbers are generated.

Examples

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

Example 331. Example of the gaussi opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

<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 exprand.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

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

instr 1
klambda	gaussi	100, 1, 3
	printk2 klambda		; look
aout	oscili	0.8, 440+klambda, 1	; & listen
	outs	aout, aout
endin

</CsInstruments>
<CsScore>
; sine wave
f 1 0 16384 10 1

i 1 0 4
e

</CsScore>
</CsoundSynthesizer>


See Also

gauss

Credits

Author: John ffitch
Bath
May 2011
New in version 5.14