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class:: DetectSilence
summary:: When input falls below a threshhold, evaluate doneAction.
categories:: UGens>Synth control, UGens>Analysis>Amplitude
Description::
When input falls below a threshhold, evaluate doneAction.
code::
// this frees after the Decay has become quiet enough for a long enough time
{ var signal = Decay.ar(Impulse.ar(0), 2, PinkNoise.ar(0.2)); DetectSilence.ar(signal, doneAction:2); signal }.play;
::
note::
If the input signal starts with silence at the beginning of the synth's duration, then DetectSilence will wait indefinitely until the first sound before starting to monitor for silence. To avoid a hanging silent sound where the input may remain zero, you can add an envelope to its input
::
classmethods::
method::ar, kr
argument::in
The input signal.
argument::amp
When input falls below this for long enough, evaluate
code::doneAction:: .
argument::time
The minimum duration for which input must fall below
code::amp:: before this triggers.
argument::doneAction
An integer representing the doneAction. See
link::Reference/UGen-doneActions:: for more detail.
returns::
This UGen outputs 1 if silence is detected, otherwise 0.
Examples::
code::
(
SynthDef("detectSilence-help", { arg out;
var z;
z = SinOsc.ar(Rand(400, 700), 0, LFDNoise3.kr(8).max(0)).softclip * 0.3;
DetectSilence.ar(z, doneAction:2);
Out.ar(out, z);
}).add;
)
Synth("detectSilence-help");
Synth("detectSilence-help");
Synth("detectSilence-help");
(
Task({
loop({
Synth("detectSilence-help");
[0.5, 1].choose.wait;
})
}).play;
)
::
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