HelpSource/Classes/PV_MagShift.schelp

   1 class:: PV_MagShift
   2 summary:: shift and stretch magnitude bin position.
   3 related:: Classes/FFT, Classes/IFFT, Classes/PV_BinShift
   4 categories:: UGens>FFT
   5
   6 Description::
   7
   8 Shift and stretch the positions of only the magnitude of the bins. Can be used as a very crude frequency shifter/scaler.
   9
  10
  11 classmethods::
  12
  13 method::new
  14
  15 argument::buffer
  16
  17 FFT buffer.
  18
  19
  20 argument::stretch
  21
  22 Scale bin location by factor.
  23
  24
  25 argument::shift
  26
  27 Add an offset to bin position.
  28
  29
  30 Examples::
  31
  32 code::
  33
  34 s.boot;
  35 b = Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01.wav");
  36
  37 (
  38 SynthDef("help-magStretch", { arg out=0, bufnum=0;
  39         var in, chain;
  40         in = LFSaw.ar(200, 0, 0.2);
  41         chain = FFT(LocalBuf(2048), in);
  42         chain = PV_MagShift(chain, MouseX.kr(0.25, 4, \exponential) );
  43         Out.ar(out, 0.1 * IFFT(chain).dup);
  44 }).play(s);
  45 )
  46
  47 (
  48 SynthDef("help-magStretch2", { arg out=0, soundBufnum=2;
  49         var in, chain;
  50         in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);
  51         chain = FFT(LocalBuf(2048), in);
  52         chain = PV_MagShift(chain, MouseX.kr(0.25, 4, \exponential) );
  53         Out.ar(out, 0.1 * IFFT(chain).dup);
  54 }).play(s, [\soundBufnum, b]);
  55 )
  56
  57 (
  58 SynthDef("help-magShift", { arg out=0;
  59         var in, chain;
  60         in = LFSaw.ar(200, 0, 0.2);
  61         chain = FFT(LocalBuf(2048), in);
  62         chain = PV_MagShift(chain, 1, MouseX.kr(-128, 128) );
  63         Out.ar(out, 0.1 * IFFT(chain).dup);
  64 }).play(s);
  65 )
  66
  67 (
  68 SynthDef("help-magShift2", {  arg out=0, soundBufnum=2;
  69         var in, chain;
  70         in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);
  71         chain = FFT(LocalBuf(2048), in);
  72         chain = PV_MagShift(chain, 1, MouseX.kr(-128, 128) );
  73         Out.ar(out, 0.1 * IFFT(chain).dup);
  74 }).play(s, [\soundBufnum, b]);
  75 )
  76
  77 ::
  78