trirand — Triangular 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 trirand opcode. It uses the file trirand.csd.
Example 950. Example of the trirand 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 RT audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o trirand.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 ; every run time same values ktri trirand 100 printk .2, ktri ; look aout oscili 0.8, 440+ktri, 1 ; & listen outs aout, aout endin instr 2 ; every run time different values seed 0 ktri trirand 100 printk .2, ktri ; look aout oscili 0.8, 440+ktri, 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 0.00067: -4.97993
i 1 time 0.20067: 1.20909
i 1 time 0.40067: 17.45873
i 1 time 0.60067: 52.55409
i 1 time 0.80067: -1.92888
i 1 time 1.00000: -11.01149
i 1 time 1.20067: 9.79521
i 1 time 1.40067: 26.98504
i 1 time 1.60067: 24.67405
i 1 time 1.80000: -67.59846
i 1 time 2.00000: 64.24861
WARNING: Seeding from current time 521999639
i 2 time 3.00067: 3.28969
i 2 time 3.20067: 54.98986
i 2 time 3.40067: -33.84788
i 2 time 3.60000: -41.93523
i 2 time 3.80067: -6.61742
i 2 time 4.00000: 39.67097
i 2 time 4.20000: 2.95123
i 2 time 4.40067: 45.59255
i 2 time 4.60067: 16.57259
i 2 time 4.80067: -18.80273
i 2 time 5.00000: -2.01697