PV_Conj complex conjugate

Inherits from: Object : AbstractFunction : UGen : PV_ChainUGen : PV_MagSquared

PV_Conj.new(chain)

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...

chain - fft chain.

See also: FFT Overview

s.boot;

(

b = Buffer.alloc(s,2048,1);

c = Buffer.read(s,"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]);

)