31 lines
729 B
Text
31 lines
729 B
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{(quad-n rate freq a b c xi)}
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(quad-l rate freq a b c xi)
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(quad-c rate freq a b c xi)
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freq - iteration frequency in Hertz
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a, b, c - equation variables
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xi - initial value of x
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General quadratic map chaotic generator. Non-, linear- and cubic-
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interpolating sound generators based on the difference equation:
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xn+1 = axn2 + bxn + c
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(define quad_ quad-c)
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(audition
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(out 0 (mul (quad_ ar 4000 1 -1 -0.75 0) 0.2)))
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(let ((r (mouse-x kr 3.5441 4 0 0.1)))
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(audition
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(out 0 (mul (quad_ ar 4000.0 (neg r) r 0 0.1) 0.4))))
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(let ((r (mouse-x kr 3.5441 4 0 0.1)))
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(audition
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(out 0 (mul (sin-osc ar (mul-add (quad_ ar 4 (neg r) r 0 0.1) 800 900) 0)
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0.4))))
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