pcauchy — Cauchy distribution random number generator (positive values only).
Cauchy distribution random number generator (positive values only). This is an x-class noise generator.
pcauchy kalpha -- controls the spread from zero (big kalpha = big spread). Outputs positive numbers only.
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 pcauchy opcode. It uses the file pcauchy.csd.
Example 735. Example of the pcauchy 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 real audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o pcauchy.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 ; every run time same values kalpha pcauchy 1000 printk .2, kalpha ; look aout oscili 0.8, 440+kalpha, 1 ; & listen outs aout, aout endin instr 2 ; every run time different values seed 0 kalpha pcauchy 1000 printk .2, kalpha ; look aout oscili 0.8, 440+kalpha, 1 ; & listen outs aout, aout endin </CsInstruments> <CsScore> ; sine wave f 1 0 16384 10 1 i 1 0 2 i 2 3 2 e </CsScore> </CsoundSynthesizer>
      Its output should include a line like this:
      
 i   1 time     0.00033:    10.48851
 i   1 time     0.20033:     0.29508
 i   1 time     0.40033:     1.75214
 i   1 time     0.60033:    22.88281
 i   1 time     0.80033:    16.06435
 i   1 time     1.00000:     0.43110
 i   1 time     1.20033:    16.51694
 i   1 time     1.40033:     2.98797
 i   1 time     1.60033:     1.32767
 i   1 time     1.80000:    17.94039
 i   1 time     2.00000:     4.85994
 Seeding from current time 1526147515
 i   2 time     3.00033:     0.89797
 i   2 time     3.20033:     9.19447
 i   2 time     3.40033:     0.73053
 i   2 time     3.60000:     7.43371
 i   2 time     3.80033:     5.87640
 i   2 time     4.00000:     0.80456
 i   2 time     4.20000:     4.50637
 i   2 time     4.40033:     2.08145
 i   2 time     4.60033:    13.47125
 i   2 time     4.80033:     3.16399
 i   2 time     5.00000:    11.05428