GEN21

     
    f  #     time   size    21      type     level     [arg1  [arg2]]

Description

This generates tables of different random distributions. (See also x-class noise generators.)

time and size are the usual GEN function arguments. level defines the amplitude. Note that GEN21 is not self-normalizing as are most other GEN functions. type defines the distribution to be used as follow:

• 1 = Uniform (positive numbers only)
• 2 = Linear (positive numbers only)
• 3 = Triangular (positive and negative numbers)
• 4 = Exponential (positive numbers only)
• 5 = Biexponential (positive and negative numbers)
• 6 = Gaussian (positive and negative numbers)
• 7 = Cauchy (positive and negative numbers)
• 8 = Positive Cauchy (positive numbers only)
• 9 = Beta (positive numbers only)
• 10 = Weibull (positive numbers only)
• 11 = Poisson (positive numbers only)

Of all these cases only 9 (Beta) and 10 (Weibull) need extra arguments. Beta needs two arguments and Weibull one.

Examples

  f1 0 1024 21 1          ; Uniform (white noise)
  f1 0 1024 21 6          ; Gaussian
  f1 0 1024 21 9 1 1 2    ; Beta (note that level precedes arguments)
  f1 0 1024 21 10 1 2     ; Weibull

All of the above additions were designed by the author between May and December 1994, under the supervision of Dr. Richard Boulanger.

Authors

Paris Smaragdis
MIT, Cambridge
1995

John ffitch
University of Bath/Codemist Ltd.
Bath, UK

New in Csound version 3.2