PV_MagAbove pass bins above a threshold


PV_MagAbove(buffer, threshold)


Passes only bins whose magnitude is above a threshold.

buffer - fft buffer.

threshold - magnitude threshold.


See also FFT Overview.


s.boot;

(

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

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

)


(

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

var in, chain;

in = SinOsc.ar(SinOsc.kr(SinOsc.kr(0.08, 0, 6, 6.2).squared, 0, 100, 800));

//in = WhiteNoise.ar(0.2);

chain = FFT(bufnum, in);

chain = PV_MagAbove(chain, 310); 

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

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

)


(

SynthDef("help-magAbove2", { arg out=0, bufnum=0;

var in, chain;

in = WhiteNoise.ar(0.2);

chain = FFT(bufnum, in);

chain = PV_MagAbove(chain, MouseX.kr(0, 10)); 

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

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

)


(

SynthDef("help-magAbove3", { 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_MagAbove(chain, MouseX.kr(0, 310)); 

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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