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