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BaseAudioContext.createOscillator

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

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

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	10 Prefixed 10 Prefixed Prefixed Requires the vendor prefix: webkit	Yes	25	No	22 22 15 Prefixed Prefixed Requires the vendor prefix: webkit	6 Prefixed 6 Prefixed Prefixed Requires the vendor prefix: webkit