HelpSource/Classes/HPZ2.schelp

   1 class:: HPZ2
   2 summary:: Two zero fixed midcut.
   3 related:: Classes/BPZ2, Classes/BRZ2, Classes/LPZ2, Classes/HPZ1
   4 categories::  UGens>Filters>Linear
   5
   6
   7 Description::
   8
   9 A special case fixed filter. Implements the formula:
  10
  11 formula::
  12 out(i) = 0.25 * (in(i) - (2 * in(i - 1)) + in(i - 2)).
  13 ::
  14
  15
  16 classmethods::
  17
  18 method::ar, kr
  19
  20 argument::in
  21
  22 The input signal.
  23
  24
  25 argument::mul
  26
  27 Output will be multiplied by this value.
  28
  29
  30 argument::add
  31
  32 This value will be added to the output.
  33
  34
  35 Examples::
  36
  37 code::
  38 // Compare:
  39
  40 { WhiteNoise.ar(0.25) }.play;
  41
  42 { HPZ2.ar(WhiteNoise.ar(0.25)) }.play;
  43
  44 // HPZ2 is useful to detect changes in a signal:
  45 // see also HPZ1
  46 (
  47 {
  48         var changingSignal = LFNoise0.ar(1000);
  49         var hpz1 = HPZ2.ar(changingSignal);
  50         [hpz1, hpz1 > 0]
  51 }.plot
  52 );
  53 ::
  54