HelpSource/Classes/BLowPass4.schelp

   1 class:: BLowPass4
   2 summary:: 24db/oct rolloff - 4th order resonant Low Pass Filter [1]
   3 categories:: UGens>Filters>BEQSuite
   4 related:: Classes/SOS, Classes/BLowPass, Classes/BHiPass, Classes/BHiPass4, Classes/BPeakEQ, Classes/BLowShelf, Classes/BHiShelf, Classes/BBandPass, Classes/BBandStop, Classes/BAllPass
   5
   6 description::
   7 The B equalization suite is based on the Second Order Section (link::Classes/SOS::) biquad UGen.
   8
   9 note::
  10 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.
  11 ::
  12
  13 [1] this is a composite pseudo link::Classes/UGen::. BLowPass4 is built by cascading 2 link::Classes/SOS:: sections.
  14
  15 classmethods::
  16
  17 method:: ar
  18 argument:: in
  19 input signal to be processed.
  20 argument:: freq
  21 cutoff frequency.
  22 argument:: rq
  23 the reciprocal of Q. bandwidth / cutoffFreq.
  24
  25 examples::
  26 code::
  27 s.boot;
  28 (
  29 z = {
  30         BLowPass4.ar(
  31                 SoundIn.ar([0,1]),
  32                 MouseX.kr(10, 20000, \exponential), // cutoff freq.
  33                 MouseY.kr(0.1, 1.0, \linear), // rq - compensate for 2 biquad sections.
  34                 0.5); // mul
  35 }.play)
  36 z.release;
  37 ::