PV_MagMul multiply magnitudes


PV_MagMul(bufferA,  bufferB)


Multiplies magnitudes of two inputs and keeps the phases of the first input.

bufferA - fft buffer A.

bufferB - fft buffer B.


See also FFT Overview.


s.boot;

(

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

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

d = Buffer.read(s,"sounds/a11wlk01.wav");

)


(

SynthDef("help-magMul", { arg out=0, bufnumA=0, bufnumB=1;

var inA, chainA, inB, chainB, chain;

inA = WhiteNoise.ar(0.2);

inB = LFSaw.ar(100, 0, 0.2);

chainA = FFT(bufnumA, inA);

chainB = FFT(bufnumB, inB);

chain = PV_MagMul(chainA, chainB); 

Out.ar(out, 0.5 * IFFT(chain).dup);

}).play(s,[\out, 0, \bufnumA, b.bufnum, \bufnumB, c.bufnum ]);

)


(

SynthDef("help-magMul2", { arg out=0, bufnumA=0, bufnumB=1, soundBufnum=2;

var inA, chainA, inB, chainB, chain;

inA = LFSaw.ar([100, 150], 0, 0.2);

inB = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 1);

chainA = FFT(bufnumA, inA);

chainB = FFT(bufnumB, inB);

chain = PV_MagMul(chainA, chainB); 

Out.ar(out,  0.1 * IFFT(chain));

}).play(s,[\out, 0, \bufnumA, b.bufnum, \bufnumB, c.bufnum, \soundBufnum, d.bufnum]);

)


b.free; c.free; d.free;

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