bexprnd — Exponential distribution random number generator.
krange -- the range of the random numbers (-krange to +krange)
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 bexprnd opcode. It uses the file bexprnd.csd.
Example 86. Example of the bexprnd 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 ;;;RT audio out ;-iadc ;;;uncomment -iadc if RT audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o bexprnd.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 ; every run time same values kexp bexprnd 100 printk .2, kexp ; look aout oscili 0.8, 440+kexp, 1 ; & listen outs aout, aout endin instr 2 ; every run time different values seed 0 kexp bexprnd 100 printk .2, kexp ; look aout oscili 0.8, 440+kexp, 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:
i 1 time 0.00267: 99.27598
i 1 time 0.20267: 74.97176
i 1 time 0.40267: -35.67213
i 1 time 0.60267: 1.10579
i 1 time 0.80267: -18.08816
i 1 time 1.00000: 28.93329
i 1 time 1.20267: 320.63733
i 1 time 1.40267: -332.05614
i 1 time 1.60267: -212.66361
i 1 time 1.80000: -92.57433
i 1 time 2.00000: 140.70939
Seeding from current time 4055201702
i 2 time 3.00267: 190.30495
i 2 time 3.20267: -58.30677
i 2 time 3.40267: 192.39784
i 2 time 3.60000: 12.72448
i 2 time 3.80267: 79.91503
i 2 time 4.00000: 34.44258
i 2 time 4.20000: 167.92680
i 2 time 4.40267: -117.10278
i 2 time 4.60267: -70.99155
i 2 time 4.80267: -23.24037
i 2 time 5.00000: -226.35500