Applies the conformal mapping
z → (z - a) / (1 - za*)
to the phase vocoder bins z with a given by the real and imag inputs to the UGen.
Makes a transformation of the complex plane so the output is full of phase vocoder artifacts but may be musically fun. Usually keep
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|a| < 1
but you can of course try bigger values to make it really noisy.
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a = 0
should give back the input mostly unperturbed.
See http://mathworld.wolfram.com/ConformalMapping.html .
buffer |
FFT buffer. |
areal |
Real part of a. |
aimag |
Imaginary part of a. |
// explore the effect
(
SynthDef("conformer2", { |out|
var in, chain, sound;
in = Mix.ar(LFSaw.ar(SinOsc.kr(Array.rand(3,0.1,0.5),0,10,[1,1.1,1.5,1.78,2.45,6.7]*220),0,0.3));
chain = FFT(LocalBuf(2048), in);
chain = PV_ConformalMap(chain, MouseX.kr(0.01,2.0, 'exponential'), MouseY.kr(0.01,10.0, 'exponential'));
sound = IFFT(chain);
Out.ar(out, Pan2.ar(CombN.ar(sound, 0.1, 0.1, 10, 0.5, sound), 0, 0.3));
}).add;
)
a = Synth("conformer2")
a.free
// sound input: use headphones to prevent feedback
(
SynthDef("conformer1", { |out|
var in, chain;
in = SoundIn.ar(0, 0.5);
chain = FFT(LocalBuf(1024), in);
chain = PV_ConformalMap(chain, MouseX.kr(-1.0,1.0), MouseY.kr(-1.0,1.0));
Out.ar(out, Pan2.ar(IFFT(chain), 0));
}).add;
)
a = Synth("conformer1")
a.free