HelpSource/Classes/PV_Conj.schelp

   1 class:: PV_Conj
   2 summary:: Complex conjugate
   3 categories:: UGens>FFT
   4
   5 description::
   6 Converts the FFT frames to their complex conjugate (i.e. reverses the sign of their imaginary part). This is not usually a useful audio effect in itself, but may be a component of other analysis or transformation processes...
   7
   8 classmethods::
   9 method:: new
  10 argument:: chain
  11 fft chain.
  12
  13 examples::
  14 code::
  15 s.boot;
  16
  17 (
  18 b = Buffer.alloc(s,2048,1);
  19 c = Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01.wav");
  20 d = Buffer.alloc(s,2048,1);
  21 )
  22
  23 (
  24 SynthDef(\help_pvconj, {  arg out=0, bufnum=0, soundBufnum=2;
  25         var in, chain;
  26         in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);
  27         chain = FFT(bufnum, in);
  28         chain = PV_Conj(chain);
  29         // Original is left, conj is right
  30         Out.ar(out, 0.3 * [in, IFFT(chain)]);
  31 }).play(s,[\out, 0, \bufnum, b, \soundBufnum, c]);
  32 )
  33
  34 (
  35 SynthDef(\help_pvconj2, {  arg out=0, bufnum=0, soundBufnum=2;
  36         var in, chainA, chainB;
  37         in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);
  38         chainA = FFT(bufnum, in);
  39         chainB = PV_Copy(chainA, d);
  40         chainB = PV_Conj(chainB);
  41         // Now we have the original and conjugate, what happens if we add them?
  42         Out.ar(out, 0.3 * (IFFT(PV_Add(chainA, chainB)).dup));
  43 }).play(s,[\out, 0, \bufnum, b, \soundBufnum, c]);
  44 )
  45 ::
  46