88 lines
1.1 KiB
Text
88 lines
1.1 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{FOS}
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First order filter section.@section{related}
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Classes/SOS
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@section{categories}
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UGens>Filters>Linear
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@section{description}
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A standard first order filter section. Filter coefficients are given
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directly rather than calculated for you. Formula is equivalent to:
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@racketblock[
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out(i) = (a0 * in(i)) + (a1 * in(i-1)) + (b1 * out(i-1))
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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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Signal input.
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@section{argument}
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a0
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See formula above.
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@section{argument}
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a1
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See formula above.
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@section{argument}
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b1
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See formula above.
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@section{argument}
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mul
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@section{argument}
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add
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@section{Examples}
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@racketblock[
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(
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// same as OnePole
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{ var x;
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x = LFTri.ar(0.4, 0, 0.99);
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FOS.ar(LFSaw.ar(200, 0, 0.2), 1 - x.abs, 0.0, x)
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}.play;
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)
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(
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// same as OneZero
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{ var x;
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x = LFTri.ar(0.4, 0, 0.99);
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FOS.ar(LFSaw.ar(200, 0, 0.2), 1 - x.abs, x, 0.0)
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}.play;
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)
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(
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// same as OnePole, kr
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{ var x, ctl;
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x = LFTri.kr(0.2, 0, 0.99);
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ctl = FOS.kr(LFSaw.kr(8, 0, 0.2), 1 - x.abs, 0.0, x);
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LFTri.ar(ctl * 200 + 500);
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}.play;
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)
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::
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]
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