72 lines
902 B
Text
72 lines
902 B
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{HPZ2}
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Two zero fixed midcut.@section{related}
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Classes/BPZ2, Classes/BRZ2, Classes/LPZ2, Classes/HPZ1
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@section{categories}
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UGens>Filters>Linear
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@section{description}
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A special case fixed filter. Implements the formula:
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@racketblock[
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out(i) = 0.25 * (in(i) - (2 * in(i - 1)) + in(i - 2)).
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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, 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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mul
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Output will be multiplied by this value.
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@section{argument}
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add
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This value will be added to the output.
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@section{Examples}
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@racketblock[
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// Compare:
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{ WhiteNoise.ar(0.25) }.play;
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{ HPZ2.ar(WhiteNoise.ar(0.25)) }.play;
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// HPZ2 is useful to detect changes in a signal:
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// see also HPZ1
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(
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{
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var changingSignal = LFNoise0.ar(1000);
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var hpz1 = HPZ2.ar(changingSignal);
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[hpz1, hpz1 > 0]
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}.plot
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);
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::
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]
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