HelpSource/Classes/BLowPass.schelp

   1 class:: BLowPass
   2 summary:: 12db/oct rolloff - 2nd order resonant Low Pass Filter
   3 categories:: UGens>Filters>BEQSuite
   4 related:: Classes/SOS, Classes/BLowPass4, 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 classmethods::
  14
  15 method:: ar
  16 argument:: in
  17 input signal to be processed.
  18 argument:: freq
  19 cutoff frequency.
  20 argument:: rq
  21 the reciprocal of Q. bandwidth / cutoffFreq.
  22 argument:: mul
  23 argument:: add
  24
  25 method:: sc
  26 calculate filter coefficients.
  27
  28 examples::
  29 code::
  30 s.boot;
  31 (
  32 z = {
  33         BLowPass.ar(
  34                 SoundIn.ar([0,1]),
  35                 MouseX.kr(10, 20000, \exponential), // cutoff freq.
  36                 MouseY.kr(0.0, 1.0, \linear), // rq
  37                 0.5); // mul
  38 }.play
  39 )
  40 z.release;
  41 ::