47 lines
1.3 KiB
Text
47 lines
1.3 KiB
Text
|
class:: PV_Conj
|
||
|
|
summary:: Complex conjugate
|
||
|
|
categories:: UGens>FFT
|
||
|
|
|
||
|
|
description::
|
||
|
|
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...
|
||
|
|
|
||
|
|
classmethods::
|
||
|
|
method:: new
|
||
|
|
argument:: buffer
|
||
|
|
FFT chain.
|
||
|
|
|
||
|
|
examples::
|
||
|
|
code::
|
||
|
|
s.boot;
|
||
|
|
|
||
|
|
(
|
||
|
|
b = Buffer.alloc(s,2048,1);
|
||
|
|
c = Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01.wav");
|
||
|
|
d = Buffer.alloc(s,2048,1);
|
||
|
|
)
|
||
|
|
|
||
|
|
(
|
||
|
|
SynthDef(\help_pvconj, { arg out=0, bufnum=0, soundBufnum=2;
|
||
|
|
var in, chain;
|
||
|
|
in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);
|
||
|
|
chain = FFT(bufnum, in);
|
||
|
|
chain = PV_Conj(chain);
|
||
|
|
// Original is left, conj is right
|
||
|
|
Out.ar(out, 0.3 * [in, IFFT(chain)]);
|
||
|
|
}).play(s,[\out, 0, \bufnum, b, \soundBufnum, c]);
|
||
|
|
)
|
||
|
|
|
||
|
|
(
|
||
|
|
SynthDef(\help_pvconj2, { arg out=0, bufnum=0, soundBufnum=2;
|
||
|
|
var in, chainA, chainB;
|
||
|
|
in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);
|
||
|
|
chainA = FFT(bufnum, in);
|
||
|
|
chainB = PV_Copy(chainA, d);
|
||
|
|
chainB = PV_Conj(chainB);
|
||
|
|
// Now we have the original and conjugate, what happens if we add them?
|
||
|
|
Out.ar(out, 0.3 * (IFFT(PV_Add(chainA, chainB)).dup));
|
||
|
|
}).play(s,[\out, 0, \bufnum, b, \soundBufnum, c]);
|
||
|
|
)
|
||
|
|
::
|
||
|
|
|