W3cubDocs

/DOM

ConvolverNode.normalize

The normalize property of the ConvolverNode interface is a boolean that controls whether the impulse response from the buffer will be scaled by an equal-power normalization when the buffer attribute is set, or not.

Its default value is true in order to achieve a more uniform output level from the convolver, when loaded with diverse impulse responses. If normalize is set to false, then the convolution will be rendered with no pre-processing/scaling of the impulse response. Changes to this value do not take effect until the next time the buffer attribute is set.

Syntax

var audioCtx = new AudioContext();
var convolver = audioCtx.createConvolver();
convolver.normalize = false;

Value

A boolean.

Example

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.normalize = false; // must be set before the buffer, to take effect
convolver.buffer = concertHallBuffer;

Specifications

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

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 14 12 25 No 15 6
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support Yes 18 Yes 26 15 ? Yes

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/ConvolverNode/normalize