40 lines
1.4 KiB
Text
40 lines
1.4 KiB
Text
class:: BLowPass4
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summary:: 24db/oct rolloff - 4th order resonant Low Pass Filter [1]
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categories:: UGens>Filters>BEQSuite
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related:: Classes/SOS, Classes/BLowPass, Classes/BHiPass, Classes/BHiPass4, Classes/BPeakEQ, Classes/BLowShelf, Classes/BHiShelf, Classes/BBandPass, Classes/BBandStop, Classes/BAllPass
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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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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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[1] this is a composite pseudo link::Classes/UGen::. BLowPass4 is built by cascading 2 link::Classes/SOS:: sections.
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classmethods::
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method:: ar
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argument:: in
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input signal to be processed.
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argument:: freq
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cutoff 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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argument:: rq
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the reciprocal of Q. bandwidth / cutoffFreq.
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argument:: mul
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argument:: add
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examples::
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code::
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s.boot;
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(
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z = {
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BLowPass4.ar(
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SoundIn.ar([0,1]),
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MouseX.kr(10, 20000, \exponential), // cutoff freq.
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MouseY.kr(0.1, 1.0, \linear), // rq - compensate for 2 biquad sections.
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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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