91 lines
1.5 KiB
Text
91 lines
1.5 KiB
Text
class:: PV_ConformalMap
|
|
summary:: Complex plane attack.
|
|
related:: Classes/FFT, Classes/IFFT
|
|
categories:: UGens>FFT
|
|
|
|
Description::
|
|
|
|
Applies the conformal mapping
|
|
|
|
code::
|
|
|
|
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
|
|
|
|
code::
|
|
|a| < 1
|
|
::
|
|
but
|
|
you can of course try bigger values to make it really noisy.
|
|
|
|
code::
|
|
a = 0
|
|
::
|
|
should
|
|
give back the input mostly unperturbed.
|
|
|
|
|
|
See link::http://mathworld.wolfram.com/ConformalMapping.html:: .
|
|
|
|
|
|
classmethods::
|
|
|
|
method::new
|
|
|
|
argument::buffer
|
|
|
|
FFT buffer.
|
|
|
|
|
|
argument::areal
|
|
|
|
Real part of a.
|
|
|
|
|
|
argument::aimag
|
|
|
|
Imaginary part of a.
|
|
|
|
|
|
Examples::
|
|
|
|
code::
|
|
|
|
//explore the effect
|
|
(
|
|
SynthDef("conformer1", {
|
|
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(0, Pan2.ar(IFFT(chain),0));
|
|
}).add;
|
|
)
|
|
|
|
a = Synth("conformer1")
|
|
a.free
|
|
|
|
(
|
|
SynthDef("conformer2", {
|
|
var in, chain, out;
|
|
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'));
|
|
out=IFFT(chain);
|
|
|
|
Out.ar(0, Pan2.ar(CombN.ar(out, 0.1, 0.1, 10, 0.5, out), 0, 0.3));
|
|
}).add;
|
|
)
|
|
|
|
a = Synth("conformer2")
|
|
a.free
|
|
::
|
|
|