Re: Time-line editor (for midi or other), and PV-spectral filter with freely settable bins

On 5 May 2008, at 10:52, Iannis Zannos wrote:

2. A PV FFT UGen that permits one to filter audio input (for example white noise) by the spectrum specified by an array of values in a buffer, where each buffer is a bin representing the amplitude at a specific frequency of the FFT;

Hey Iannis,

You can do 2. just with PV_MagMul.

S.

(

//use as table

var size = 700, bufsize = 2048, sum, factor, step, env;

factor = bufsize / size;

step = factor.reciprocal;

t = Array.fill(size - 1, {|i| (i + 1).explin(1, size, 1, bufsize) - 1});

sum = t.sum;

t = t * (1 / sum);

e = Buffer.alloc(s, bufsize, 1);

d = Buffer.alloc(s, bufsize, 1);

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

a = SCWindow("test", Rect(200 , 450, size + 40, 150));

a.view.decorator =  FlowLayout(a.view.bounds);

b = SCMultiSliderView(a, Rect(0, 0, size, 100));

c = Array.new;

size.do({arg i;

c = c.add(0.0);

});

c = c.reverse;

b.value_(c);

b.isFilled_(true);

// width in pixels of each stick 

b.indexThumbSize_(1);

// spacing on the value axis

b.gap_(0);

a.front;

env = Env(c, t);

d.loadCollection(env.asSignal(bufsize));

b.action = {arg ms; 

var ind, firstChd, lastChd, setSize, muls;

ind = ms.index;

c[ind] = ms.value[ind];

};

b.mouseUpAction = {

d.loadCollection(Env(c, t).asSignal(bufsize); );

};

)

(

SynthDef("help-magMul", { arg out=0, bufnumA=0, bufnumB=1;

var inA, chainA, inB, chainB, chain;

inA = WhiteNoise.ar(0.2);

chainA = FFT(bufnumA, inA);

chain = PV_MagMul(chainA, bufnumB); 

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

}).play(s,[\out, 0, \bufnumA, e.bufnum, \bufnumB, d.bufnum ]);

)

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