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 |