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. Play pcauchy.csd
Example 738. 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