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class:: PV_MagShift
summary:: shift and stretch magnitude bin position.
related:: Classes/FFT, Classes/IFFT, Classes/PV_BinShift
categories:: UGens>FFT
Description::
Shift and stretch the positions of only the magnitude of the bins. Can be used as a very crude frequency shifter/scaler.
classmethods::
method::new
argument::buffer
FFT buffer.
argument::stretch
Scale bin location by factor.
argument::shift
Add an offset to bin position.
Examples::
code::
s.boot;
b = Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01.wav");
(
SynthDef("help-magStretch", { arg out=0, bufnum=0;
var in, chain;
in = LFSaw.ar(200, 0, 0.2);
chain = FFT(LocalBuf(2048), in);
chain = PV_MagShift(chain, MouseX.kr(0.25, 4, \exponential) );
Out.ar(out, 0.1 * IFFT(chain).dup);
}).play(s);
)
(
SynthDef("help-magStretch2", { 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_MagShift(chain, MouseX.kr(0.25, 4, \exponential) );
Out.ar(out, 0.1 * IFFT(chain).dup);
}).play(s, [\soundBufnum, b]);
)
(
SynthDef("help-magShift", { arg out=0;
var in, chain;
in = LFSaw.ar(200, 0, 0.2);
chain = FFT(LocalBuf(2048), in);
chain = PV_MagShift(chain, 1, MouseX.kr(-128, 128) );
Out.ar(out, 0.1 * IFFT(chain).dup);
}).play(s);
)
(
SynthDef("help-magShift2", { 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_MagShift(chain, 1, MouseX.kr(-128, 128) );
Out.ar(out, 0.1 * IFFT(chain).dup);
}).play(s, [\soundBufnum, b]);
)
::
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