Weibull distribution random number generator (positive values only). This is an x-class noise generator
ksigma -- scales the spread of the distribution.
ktau -- if greater than one, numbers near ksigma are favored. If smaller than one, small values are favored. If t equals 1, the distribution is exponential. Outputs only positive numbers.
For more detailed explanation of these distributions, see:
C. Dodge - T.A. Jerse 1985. Computer music. Schirmer books. pp.265 - 286
D. Lorrain. A panoply of stochastic cannons. In C. Roads, ed. 1989. Music machine . Cambridge, Massachusetts: MIT press, pp. 351 - 379.
Here is an example of the weibull opcode. It uses the files weibull.orc and weibull.sco.
Example 1. Example of the weibull opcode.
/* weibull.orc */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
; Instrument #1.
instr 1
; Generate a random number in a Weibull distribution.
; ksigma = 1
; ktau = 1
i1 weibull 1, 1
print i1
endin
/* weibull.orc */
/* weibull.sco */
; Play Instrument #1 for one second.
i 1 0 1
e
/* weibull.sco */
instr 1: i1 = 1.834