97 lines
1.3 KiB
Text
97 lines
1.3 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{LeastChange}
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Output least changed@section{related}
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Classes/MostChange, Classes/LastValue
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@section{categories}
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UGens>Maths
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@section{description}
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Given two inputs
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@racketblock[a:: and ]
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@racketblock[b::, let ]
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@racketblock[da[t] = abs(a[t] - a[t - 1]):: and ]
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@racketblock[db[t] = abs(b[t] - b[t - 1])::. Output ]
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@racketblock[a[t]:: if ]
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@racketblock[da[t]:: is smaller, and output ]
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@racketblock[b[t]:: if ]
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@racketblock[db[t]:: is smaller. If ]
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@racketblock[da[t] == db[t]::, use whichever input was used last (assume ]
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@racketblock[a:: for the first sample of output).
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]
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@section{classmethods}
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@section{method}
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ar, kr
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@section{argument}
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a
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Input signal A.
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@section{argument}
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b
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Input signal B.
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@section{examples}
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@racketblock[
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(
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d = { arg amp=1.0;
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var in1, in2;
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in1 = LFNoise0.ar(800, amp);
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in2 = SinOsc.ar(800);
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LeastChange.ar(in1, in2) * 0.1;
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}.play;
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)
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d.set(\amp, 0.1);
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d.set(\amp, 0);
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d.set(\amp, 3);
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d.free;
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::
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the control that changed least is used as output:
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]
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@racketblock[
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(
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d = { arg freq=440;
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var internalFreq;
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internalFreq = LFNoise0.ar(0.3, 300, 800);
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SinOsc.ar(
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LeastChange.kr(freq, internalFreq) // two sources of change: one external, one internal
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) * 0.1
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}.play
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);
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d.set(\freq, 800);
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d.set(\freq, 900);
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d.free;
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::
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]
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