37 lines
850 B
Text
37 lines
850 B
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{(cusp-n rate freq a b xi)}
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(cusp-l rate freq a b xi)
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freq - iteration frequency in Hertz
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a, b - equation variables
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xi - initial value of x
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Cusp map chaotic generator. Non- and linear- interpolating sound
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generator based on the difference equation:
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xn+1 = a - b*sqrt(|xn|)
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(define cusp_ cusp-l)
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vary frequency
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(let ((x (mouse-x kr 20 sample-rate 0 0.1)))
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(audition (out 0 (mul (cusp_ ar x 1.0 1.99 0) 0.3))))
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mouse-controlled params
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(let ((x (mouse-x kr 0.9 1.1 1 0.1))
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(y (mouse-y kr 1.8 2 1 0.1)))
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(audition (out 0 (mul (cusp_ ar (fdiv sample-rate 4) x y 0) 0.3))))
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as a frequency control
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(let* ((x (mouse-x kr 0.9 1.1 1 0.1))
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(y (mouse-y kr 1.8 2 1 0.1))
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(f (mul-add (cusp_ ar 40 x y 0) 800 900)))
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(audition (out 0 (mul (sin-osc ar f 0.0) 0.4))))
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