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class:: SLOnset
summary::experimental time domain onset detector
categories:: UGens>Analysis
//SLUGens released under the GNU GPL as extensions for SuperCollider 3, by Nick Collins, http://composerprogrammer.com/index.html
keyword:: SLUGens
Description::
Purely time domain onset detector
Works well for loud signals but fainter onsets are missed, and really loud onsets lead to multiple triggers.
(my note: needs some sort of log amplitude correction?)
Examples::
code::
(
x = {arg threshold=10.0;
var input, onsets;
input = SoundIn.ar(0);
onsets= SLOnset.kr(input,20,5,5,threshold);
Out.ar(0, SinOsc.ar(440,0,0.1)*Decay2.ar(K2A.ar(onsets), 0.01, 0.1));
}.play;
)
x.set(\threshold, 10.0)
x.free;
b = Buffer.read(s,"sounds/a11wlk01.wav"); // remember to free the buffer later.
b = Buffer.read(s,"sounds/break2"); // remember to free the buffer later.
(
x = {arg threshold=10.0, hysteresis=20;
var input, onsets;
input = PlayBuf.ar(1, b, BufRateScale.kr(b), loop:1);
onsets= SLOnset.kr(input,20,5,5,threshold,hysteresis);
Out.ar(0, input + (SinOsc.ar(440,0,0.1)*Decay2.ar(K2A.ar(onsets), 0.01, 0.05)));
}.play;
)
//by setting these appropriately can get somewhere...
x.set(\threshold, 50.0)
x.set(\hysteresis, 10.0)
b.free;
::
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