BaseAudioContext.createOscillator()

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

Note: The OscillatorNode() constructor is the recommended way to create a OscillatorNode; see Creating an AudioNode.

Syntax

var oscillatorNode = 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.setValueAtTime(3000, audioCtx.currentTime); // value in hertz
oscillator.connect(audioCtx.destination);
oscillator.start();

Specifications

Specification
Web Audio API # dom-baseaudiocontext-createoscillator

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`createOscillator`	20	12	25	No	15	6	≤37	25	25	14	6	1.5