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The release
property of the DynamicsCompressorNode
interface Is a k-rate AudioParam
representing the amount of time, in seconds, required to increase the gain by 10 dB. It defines how quick the signal is adapted when its volume is reduced.
The release
property's default value is 0.25
and it can be set between 0
and 1
.
Syntax
var audioCtx = new AudioContext(); var compressor = audioCtx.createDynamicsCompressor(); compressor.release.value = 0.25;
Value
An AudioParam
.
Note: Though the AudioParam
returned is read-only, the value it represents is not.
Example
The below code demonstrates a simple usage of createDynamicsCompressor()
to add compression to an audio track. For a more complete example, have a look at our basic Compressor example (view the source code).
// Create a MediaElementAudioSourceNode // Feed the HTMLMediaElement into it var source = audioCtx.createMediaElementSource(myAudio); // Create a compressor node var compressor = audioCtx.createDynamicsCompressor(); compressor.threshold.value = -50; compressor.knee.value = 40; compressor.ratio.value = 12; compressor.reduction.value = -20; compressor.attack.value = 0; compressor.release.value = 0.25; // connect the AudioBufferSourceNode to the destination source.connect(audioCtx.destination); button.onclick = function() { var active = button.getAttribute('data-active'); if(active == 'false') { button.setAttribute('data-active', 'true'); button.innerHTML = 'Remove compression'; source.disconnect(audioCtx.destination); source.connect(compressor); compressor.connect(audioCtx.destination); } else if(active == 'true') { button.setAttribute('data-active', 'false'); button.innerHTML = 'Add compression'; source.disconnect(compressor); compressor.disconnect(audioCtx.destination); source.connect(audioCtx.destination); } }
Specifications
Specification | Status | Comment |
---|---|---|
Web Audio API The definition of 'release' in that specification. |
Working Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 10.0webkit | 25.0 (25.0) | Not supported | 15.0webkit 22 (unprefixed) |
6.0webkit |
Feature | Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|
Basic support | ? | 26.0 | 1.2 | ? | ? | ? | 33.0 |