65 lines
1.1 KiB
Text
65 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{BPF}
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2nd order Butterworth bandpass filter.@section{related}
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Classes/BRF, Classes/HPF, Classes/LPF
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@section{categories}
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UGens>Filters>Linear
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@section{description}
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A second order band pass filter.
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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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freq
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Centre frequency in Hertz.
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WARNING: due to the nature of its implementation frequency values close to 0 may cause glitches and/or extremely loud audio artifacts!
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@section{argument}
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rq
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The reciprocal of Q. Q is conventionally defined as cutoffFreq / bandwidth, meaning rq = (bandwidth / cutoffFreq).
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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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{ BPF.ar(Saw.ar(200,0.5), FSinOsc.kr(XLine.kr(0.7,300,20),0,3600,4000), 0.3) }.play;
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{ BPF.ar(Saw.ar(200,0.5), MouseX.kr(100, 10000, 1), 0.3) }.play;
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// BPF on control signals:
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(
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{ var vib = BPF.kr(PinkNoise.kr, MouseX.kr(1, 100, 1), 0.3) * 10;
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SinOsc.ar(vib * 200 + 600) * 0.2 }.play;
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)
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::
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]
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