PV_BinShift shift and stretch bin position


PV_BinShift(buffer,  stretch,  shift)


Shift and scale the positions of the bins. 

Can be used as a very crude frequency shifter/scaler.

buffer - fft buffer.

stretch - scale bin location by factor.

shift - add an offset to bin position.


See also FFT Overview.


s.boot;

(

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

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

)


(

SynthDef("help-binStretch", { arg out=0, bufnum=0;

var in, chain;

in = LFSaw.ar(200, 0, 0.2);

chain = FFT(bufnum, in);

chain = PV_BinShift(chain, MouseX.kr(0.25, 4, \exponential) ); 

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

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

)


(

SynthDef("help-binStretch2", { 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_BinShift(chain, MouseX.kr(0.25, 4, \exponential) ); 

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

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

)


(

SynthDef("help-binShift", { arg out=0, bufnum=0;

var in, chain;

in = LFSaw.ar(200, 0, 0.2);

chain = FFT(bufnum, in);

chain = PV_BinShift(chain, 1, MouseX.kr(-128, 128) ); 

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

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

)


(

SynthDef("help-binShift2", {  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_BinShift(chain, 1, MouseX.kr(-128, 128) ); 

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

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

)


b.free; c.free;

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