BaseAudioContext.createConvolver()

The createConvolver() method of the BaseAudioContext interface creates a ConvolverNode, which is commonly used to apply reverb effects to your audio. See the spec definition of Convolution for more information.

Syntax

baseAudioContext.createConvolver();

Returns

A ConvolverNode.

Example

The following example shows basic usage of an AudioContext to create a convolver node. The basic premise is that you create an AudioBuffer containing a sound sample to be used as an ambience to shape the convolution (called the impulse response,) and apply that to the convolver. The example below uses a short sample of a concert hall crowd, so the reverb effect applied is really deep and echoey.

For applied examples/information, check out our Voice-change-O-matic demo (see app.js for relevant code).

var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
var convolver = audioCtx.createConvolver();

  ...

// grab audio track via XHR for convolver node

var soundSource, concertHallBuffer;

ajaxRequest = new XMLHttpRequest();
ajaxRequest.open('GET', 'concert-crowd.ogg', true);
ajaxRequest.responseType = 'arraybuffer';

ajaxRequest.onload = function() {
  var audioData = ajaxRequest.response;
  audioCtx.decodeAudioData(audioData, function(buffer) {
      concertHallBuffer = buffer;
      soundSource = audioCtx.createBufferSource();
      soundSource.buffer = concertHallBuffer;
    }, function(e){"Error with decoding audio data" + e.err});
}

ajaxRequest.send();

  ...

convolver.buffer = concertHallBuffer;

Specifications

Specification Status Comment
Web Audio API
The definition of 'createConvolver()' in that specification.
Working Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
createConvolverChrome Full support 10
Prefixed
Full support 10
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge Full support YesFirefox Full support 53
Notes
Full support 53
Notes
Notes Originally implemented on AudioContext in Firefox 25.
IE No support NoOpera Full support 22
Full support 22
Full support 15
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Safari Full support 6
Prefixed
Full support 6
Prefixed
Prefixed Implemented with the vendor prefix: webkit
WebView Android Full support YesChrome Android Full support 33Firefox Android Full support 53
Notes
Full support 53
Notes
Notes Originally implemented on AudioContext in Firefox Android 26.
Opera Android Full support 22
Full support 22
Full support 14
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Safari iOS No support NoSamsung Internet Android Full support Yes

Legend

Full support  
Full support
No support  
No support
See implementation notes.
See implementation notes.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

See also