The createWaveShaper()
method of the BaseAudioContext
interface creates a WaveShaperNode
, which represents a non-linear distortion. It is used to apply distortion effects to your audio.
Syntax
baseAudioCtx.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: Sigmoid functions are commonly used for distortion curves because of their natural properties. Their S-shape, for instance, helps create a smoother sounding result. 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
Desktop | Mobile | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic support | Chrome
Full support
10
| Edge Full support Yes | Firefox Full support 25 | IE No support No | Opera
Full support
22
| Safari
Full support
6
| WebView Android Full support Yes | Chrome Android Full support 33 | Edge Mobile Full support Yes | Firefox Android Full support 26 | Opera Android Full support Yes | Safari iOS No support No | Samsung Internet Android ? |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Requires a vendor prefix or different name for use.
- Requires a vendor prefix or different name for use.