92 lines
1.3 KiB
Racket
92 lines
1.3 KiB
Racket
#lang scribble/manual
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@(require (for-label racket))
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@title{LinCongL}
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Linear congruential chaotic generator@section{categories}
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UGens>Generators>Chaotic
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@section{related}
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Classes/LinCongC, Classes/LinCongN
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@section{description}
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A linear-interpolating sound generator based on the difference equation:
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teletype::
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x(n+1) = (a * x(n) + c) % m
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::
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The output signal is automatically scaled to a range of [-1, 1].
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sclang code translation:
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@racketblock[
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(
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var a = 1.1, c = 0.13, m = 1, xi = 0, size = 64;
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plot(size.collect { xi = (a * xi + c) % m });
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)
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::
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]
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@section{classmethods}
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@section{method}
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ar
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@section{argument}
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freq
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Iteration frequency in Hertz
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@section{argument}
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a
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Multiplier amount
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@section{argument}
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c
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Increment amount
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@section{argument}
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m
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Modulus amount
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@section{argument}
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xi
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Initial value of x
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@section{examples}
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@racketblock[
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// default initial params
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{ LinCongL.ar(MouseX.kr(20, SampleRate.ir)) * 0.2 }.play(s);
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::
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]
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@racketblock[
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// randomly modulate params
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(
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{ LinCongL.ar(
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LFNoise2.kr(1, 1e4, 1e4),
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LFNoise2.kr(0.1, 0.5, 1.4),
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LFNoise2.kr(0.1, 0.1, 0.1),
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LFNoise2.kr(0.1)
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) * 0.2 }.play(s);
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)
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::
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]
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@racketblock[
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// as frequency control...
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(
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{
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SinOsc.ar(
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LinCongL.ar(
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40,
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LFNoise2.kr(0.1, 0.1, 1),
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LFNoise2.kr(0.1, 0.1, 0.1),
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LFNoise2.kr(0.1),
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0, 500, 600
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)
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) * 0.4 }.play(s);
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)
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::
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]
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