BaseAudioContext: createOscillator() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2021.

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

js
createOscillator()

Parameters

None.

Return value

An OscillatorNode.

Examples

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.

js
// create web audio api context
const audioCtx = new AudioContext();

// create Oscillator node
const 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

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See also