HelpSource/Classes/HPZ1.schelp

   1 class:: HPZ1
   2 summary:: Two point difference filter
   3 related:: Classes/LPZ1, Classes/HPZ2
   4 categories::  UGens>Filters>Linear
   5
   6
   7 Description::
   8
   9 A special case fixed filter. Implements the formula:
  10
  11 code::
  12 out(i) = 0.5 * (in(i) - in(i-1))
  13 ::
  14
  15 Which is a two point differentiator.
  16
  17
  18 classmethods::
  19
  20 method::ar, kr
  21
  22 argument::in
  23
  24 The input signal.
  25
  26
  27 argument::mul
  28
  29 Output will be multiplied by this value.
  30
  31
  32 argument::add
  33
  34 This value will be added to the output.
  35
  36
  37 Examples::
  38
  39 code::
  40 // Compare:
  41
  42 { WhiteNoise.ar(0.25) }.play;
  43
  44 { HPZ1.ar(WhiteNoise.ar(0.25)) }.play;
  45
  46 // HPZ1 is useful to detect changes in a signal:
  47 // see also HPZ2
  48 (
  49 {
  50         var changingSignal = LFNoise0.ar(1000);
  51         var hpz1 = HPZ1.ar(changingSignal);
  52         [hpz1, hpz1 > 0, hpz1.abs > 0]
  53 }.plot
  54 );
  55 ::
  56