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;

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

(

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

var in, chain;

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

chain = FFT(LocalBuf(2048), in);

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

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

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

)

(

SynthDef("help-binStretch2", { arg out=0, soundBufnum=2;

var in, chain;

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

chain = FFT(LocalBuf(2048), in);

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

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

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

)

(

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

var in, chain;

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

chain = FFT(LocalBuf(2048), in);

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

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

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

)

(

SynthDef("help-binShift2", {  arg out=0, soundBufnum=2;

var in, chain;

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

chain = FFT(LocalBuf(2048), in);

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

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

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

)

c.free;