HelpSource/Classes/RunningSum.schelp

   1 class:: RunningSum
   2 summary:: Running sum over n frames
   3 categories:: UGens>Analysis, UGens>Maths
   4
   5 description::
   6 A running sum over a user specified number of samples, useful for running RMS power windowing.
   7
   8 classmethods::
   9 method:: ar, kr
  10 argument::in
  11 Input signal
  12 argument::numsamp
  13 How many samples to take the running sum over (initialisation time only, not modulatable. default: 40)
  14
  15 examples::
  16
  17 code::
  18 // distorts of course - would need scaling
  19 { RunningSum.ar(SoundIn.ar) }.play
  20
  21 // Running Average over x samples
  22 (
  23 {
  24     var x = 100;
  25     RunningSum.ar(LFSaw.ar, x) * (x.reciprocal)
  26  }.play
  27 )
  28 ::
  29
  30 code::
  31 // RMS Power
  32 (
  33 {
  34     var input, numsamp;
  35
  36     input = LFSaw.ar;
  37     numsamp = 30;
  38
  39     (RunningSum.ar(input.squared, numsamp) / numsamp).sqrt
  40 }.play
  41 )
  42 ::
  43
  44 code::
  45 // shortcut in class
  46 { RunningSum.rms(SoundIn.ar) }.play
  47 ::
  48
  49 code::
  50 // play around
  51 (
  52 {
  53     var input, numsamp, power;
  54     numsamp = 500;
  55     input = SoundIn.ar;
  56     power = MouseX.kr(0.1, 4);
  57
  58     (RunningSum.ar(input ** power, numsamp)/numsamp) ** (power.reciprocal)
  59 }.play
  60 )
  61 ::