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AudioContext.createOscillator

The createOscillator() method of the AudioContext interface creates an OscillatorNode, a source representing a periodic waveform. It basically generates a constant tone.

Syntax

var audioCtx = new AudioContext();
var oscillator = audioCtx.createOscillator();

Returns

An OscillatorNode.

Example

The following example shows basic usage of an AudioContext to create an oscillator node. For applied examples/information, check out our Violent Theremin demo (see app.js for relevant code); also see our OscillatorNode page for more information.

// create web audio api context
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();

// create Oscillator node
var oscillator = audioCtx.createOscillator();

oscillator.type = 'square';
oscillator.frequency.value = 3000; // value in hertz
oscillator.start();

Specifications

Specification	Status	Comment
Web Audio API The definition of 'createOscillator' in that specification.	Working Draft

Browser compatibility

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	10.0webkit	(Yes)	25.0 (25.0)	No support	15.0webkit 22 (unprefixed)	6.0webkit