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The createWaveShaper() method of the AudioContext interface creates a WaveShaperNode, which represents a non-linear distortion. It is used to apply distortion effects to your audio.
Syntax
var audioCtx = new AudioContext(); var distortion = audioCtx.createWaveShaper();
Returns
Example
The following example shows basic usage of an AudioContext to create a wave shaper node. For applied examples/information, check out our Voice-change-O-matic demo (see app.js for relevant code).
Note: Distortion curves are not the easiest thing to work out, and you will probably need to look around to find such algorithms. We found the below distortion curve code on Stack Overflow.
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
var distortion = audioCtx.createWaveShaper();
...
function makeDistortionCurve(amount) {
var k = typeof amount === 'number' ? amount : 50,
n_samples = 44100,
curve = new Float32Array(n_samples),
deg = Math.PI / 180,
i = 0,
x;
for ( ; i < n_samples; ++i ) {
x = i * 2 / n_samples - 1;
curve[i] = ( 3 + k ) * x * 20 * deg / ( Math.PI + k * Math.abs(x) );
}
return curve;
};
...
distortion.curve = makeDistortionCurve(400);
distortion.oversample = '4x';
Specifications
| Specification | Status | Comment |
|---|---|---|
| Web Audio API The definition of 'createWaveShaper()' 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 |
See also
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