Packages

object PV_ConformalMap extends Serializable

A UGen that applies the conformal mapping z => (z - a) / (1 - za*) to its input FFT bins z .

It makes a transformation of the complex plane so the output is full of phase vocoder artifacts but may be musically interesting. One should usually keep |a| < 1 , although bigger values may be used to produce noise. A value of a = 0 gives back the input mostly unperturbed.

Examples
// mouse control
play {
  val sf   = Seq.fill(3)(Rand(0.1, 0.5))
  val sadd = Seq(1, 1.1, 1.5, 1.78, 2.45, 6.7).map(_ * 220)
  val in   = Mix(LFSaw.ar(SinOsc.kr(sf).madd(10, sadd)) * 0.3)
  val fft  = FFT(LocalBuf(2048), in)
  val re   = MouseX.kr(0.01,  2.0, 1)
  val im   = MouseY.kr(0.01, 10.0, 1)
  val pv   = PV_ConformalMap(fft, re, im)
  val out  = IFFT.ar(pv)
  val vrb  = CombN.ar(out, 0.1, 0.1, 10)
  Pan2.ar(out + vrb * 0.5, 0, 0.3)
}
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