HelpSource/Classes/PV_LocalMax.schelp

   1 class:: PV_LocalMax
   2 summary:: Pass bins which are a local maximum.
   3 related:: Classes/FFT, Classes/IFFT, Classes/PV_MagAbove, Classes/PV_MagBelow, Classes/PV_MagClip
   4 categories:: UGens>FFT
   5
   6 Description::
   7
   8 Passes only bins whose magnitude is above a threshold and above their nearest neighbors.
   9
  10
  11 classmethods::
  12
  13 method::new
  14
  15 argument::buffer
  16
  17 FFT buffer.
  18
  19
  20 argument::threshold
  21
  22 Magnitude threshold.
  23
  24
  25 Examples::
  26
  27 code::
  28 s.boot;
  29 b = Buffer.read(s, Help.dir +/+ "sounds/a11wlk01.wav");
  30
  31
  32 (
  33 SynthDef("help-localMax", { arg out=0;
  34         var in, chain;
  35         in = Mix.arFill(3, { LFSaw.ar(exprand(100, 500), 0, 0.1); });
  36         chain = FFT(LocalBuf(2048), in);
  37         chain = PV_LocalMax(chain, MouseX.kr(0, 50));
  38         Out.ar(out, 0.5 * IFFT(chain).dup);
  39 }).play(s);
  40 )
  41
  42 (
  43 SynthDef("help-localMax2", { arg out=0, soundBufnum=2;
  44         var in, chain;
  45         in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);
  46         chain = FFT(LocalBuf(2048), in);
  47         chain = PV_LocalMax(chain, MouseX.kr(0, 100));
  48         Out.ar(out, 0.1 * IFFT(chain).dup);
  49 }).play(s, [\soundBufnum, b]);
  50 )
  51
  52 ::
  53