64 lines
1.5 KiB
Text
64 lines
1.5 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{BAllPass}
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All Pass Filter@section{categories}
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UGens>Filters>BEQSuite
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@section{related}
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Classes/SOS, Classes/BLowPass, Classes/BLowPass4, Classes/BHiPass, Classes/BHiPass4, Classes/BPeakEQ, Classes/BLowShelf, Classes/BHiShelf, Classes/BBandPass, Classes/BBandStop
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@section{description}
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The B equalization suite is based on the Second Order Section (link::Classes/SOS::) biquad UGen.
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@section{note}
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Biquad coefficient calculations imply certain amount of CPU overhead. These plugin UGens contain optimizations such that the coefficients get updated only when there has been a change to one of the filter's parameters. This can cause spikes in CPU performance and should be considered when using several of these units.
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::
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@section{classmethods}
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@section{method}
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ar
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@section{argument}
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in
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input signal to be processed.
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@section{argument}
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freq
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center frequency.
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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. 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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s.boot;
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(
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z = { // thru
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BAllPass.ar(
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SoundIn.ar([0, 1]),
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MouseX.kr(10, 18000, \exponential),
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0.8, // rq
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0.5); // mul
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}.play)
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z.release;
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(
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z = { // like a bandpass
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var sig;
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sig = SoundIn.ar([0,1]), * 0.5;
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BAllPass.ar(sig, MouseX.kr(10, 18000, \exponential), 0.8) + sig.neg
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}.play)
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z.release;
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::
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]
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