PV_Freeze freeze FFT frames

PV_Freeze(buffer, freeze)

Freezes magnitudes at current levels when freeze > 0, and advances phase according to difference between frames to try and maintain currect spectral quality.

buffer - fft buffer.

freeze - if freeze > 0 then magnitudes are frozen at current levels.

See also FFT Overview.

s.boot;

(

b = Buffer.alloc(s,1024);

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

)

// compare PV_Freeze with PV_MagFreeze

(

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

var in, chain;

in = SinOsc.ar(LFNoise1.kr(5.2,250,400));

chain = FFT(bufnum, in);

// uncomment the line below to compare while ...

//chain = PV_MagFreeze(chain, SinOsc.kr(0.2) ); 

// commenting the line below 

chain = PV_Freeze(chain, SinOsc.kr(0.2) ); 

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

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

)

(

//trig with MouseY

SynthDef("help-magFreeze2", { arg out=0, bufnum=0, soundBufnum=2;

var in, chain;

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

chain = FFT(bufnum, in);

// uncomment the line below to compare while ...

// chain = PV_MagFreeze(chain, MouseY.kr > 0.5 ); 

// commenting the line below 

chain = PV_Freeze(chain, MouseY.kr > 0.5 ); 

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

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

)

b.free; c.free;