76 lines
1.2 KiB
Text
76 lines
1.2 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{Peak}
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Track peak signal amplitude.@section{related}
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Classes/PeakFollower
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@section{categories}
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UGens>Analysis>Amplitude
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@section{description}
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Outputs the peak amplitude of the signal received at the input. When
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a trigger occurs at the
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@racketblock[reset:: input, the maximum
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output value is reset to the current value.
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Internally, the absolute value of the signal is used, to prevent
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underreporting the peak value if there is a negative DC offset. To obtain
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the minimum and maximum values of the signal as is, use the
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link::Classes/RunningMin:: and link::Classes/RunningMax:: UGens.
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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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in
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The input signal.
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@section{argument}
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trig
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Trigger. Resets the output value to the current input value. A trigger happens when the signal changes from non-positive to positive.
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@section{Examples}
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@racketblock[
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(
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{
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SinOsc.ar(
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Peak.ar(Dust.ar(20), Impulse.ar(0.4)) * 500 + 200,
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0, 0.2
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)
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}.play;
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)
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// follow a sine lfo, reset rate controlled by mouse x
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(
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{
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SinOsc.ar(
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Peak.kr(SinOsc.kr(0.2), Impulse.kr(MouseX.kr(0.01, 2, 1))) * 500 + 200,
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0, 0.2
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)
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}.play;
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)
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::
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]
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