39 lines
1.2 KiB
Plaintext
39 lines
1.2 KiB
Plaintext
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;nyquist plug-in
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;name "Random Tones..."
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;type generate
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;version 4
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;author "dm"
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;action "Generating Random Tones..."
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;control seed "Random Seed" int "" 12532 1 134455
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;control duration "Length (Seconds)" float "" 3 0 10
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;control num-tones "Number of tones" int "" 15 1 100
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;control middle "Center Frequency (Hz)" float-text "" 1000 0 20000
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;control width "Width" float-text "" 1 0 20000
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;control table-type "Table" choice "Sine,Saw,Square,Triangle" 0
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;;;generate pseudorandom int between 1 and 134456
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(defun rnd ()
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(setq seed (rem (sum (mult 8121 seed) 28411) 134456)))
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;;;generate pseudrandom float between 0 and 1
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(defun rnd-scale ()
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(/ (float (rnd)) 134456.0))
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;;;generate pseudorandom (uniformly distributed) frequency within width of middle
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(defun rnd-freq ()
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(print (min (/ *sound-srate* 2.1)
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(+ middle (* (- (rnd-scale) 0.5) width 2.0)))))
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(defun gen-tone (hz-freq tbl)
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(case tbl
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(0 (sine (hz-to-step hz-freq)))
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(1 (osc-saw hz-freq))
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(2 (osc-pulse hz-freq 0.0))
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(3 (osc-tri hz-freq))))
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(stretch-abs duration
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(do* ((tone 0 (incf tone))
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(pch 1.0 (rnd-freq))
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(result 0 (sum result (scale (rnd-scale) (gen-tone pch table-type)))))
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((= tone num-tones) (scale (/ (float num-tones)) result))))
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