BaseAudioContext.createWaveShaper()
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.
Note: The WaveShaperNode()
constructor is the recommended way to create a WaveShaperNode
; see
Creating an AudioNode.
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 |
---|
Web Audio API # dom-baseaudiocontext-createwaveshaper |
Browser compatibility
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