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
   9 nearest neighbors.
  10
  11
  12 classmethods::
  13
  14 method::new
  15
  16 argument::buffer
  17
  18 FFT buffer.
  19
  20
  21 argument::threshold
  22
  23 Magnitude threshold.
  24
  25
  26 Examples::
  27
  28 code::
  29
  30 s.boot;
  31
  32 (
  33 b = Buffer.alloc(s,2048,1);
  34 c = Buffer.read(s,"sounds/a11wlk01.wav");
  35 )
  36
  37 (
  38 SynthDef("help-localMax", { arg out=0, bufnum=0;
  39         var in, chain;
  40         in = Mix.arFill(3, { LFSaw.ar(exprand(100, 500), 0, 0.1); });
  41         chain = FFT(bufnum, in);
  42         chain = PV_LocalMax(chain, MouseX.kr(0, 50));
  43         Out.ar(out, 0.5 * IFFT(chain).dup);
  44 }).play(s,[\out, 0, \bufnum, b.bufnum]);
  45 )
  46
  47 (
  48 SynthDef("help-localMax2", { arg out=0, bufnum=0, soundBufnum=2;
  49         var in, chain;
  50         in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);
  51         chain = FFT(bufnum, in);
  52         chain = PV_LocalMax(chain, MouseX.kr(0, 100));
  53         Out.ar(out, 0.5 * IFFT(chain).dup);
  54 }).play(s,[\out, 0, \bufnum, b.bufnum, \soundBufnum, c.bufnum]);
  55 )
  56
  57 ::
  58