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 APIThe definition of 'normalize' in that specification. | Working Draft |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
normalize
|
Chrome
Full support 14 |
Edge
Full support 12 |
Firefox
Full support 25 |
IE
No support No |
Opera
Full support 15 |
Safari
Full support 6 |
WebView Android
Full support Yes |
Chrome Android
Full support 18 |
Firefox Android
Full support 26 |
Opera Android
Full support 14 |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support 1.0 |
Legend
- Full support
- Full support
- No support
- No support
See also
ConvolverNode.normalize by Mozilla Contributors is licensed under CC-BY-SA 2.5.