OscillatorNode.frequency

Syntax

var oscillator = audioCtx.createOscillator();
oscillator.frequency.setValueAtTime(440, audioCtx.currentTime); // value in hertz

Value

An a-rate AudioParam.

Example

The following example shows basic usage of an AudioContext to create an oscillator node. For an applied example, check out our Violent Theremin demo (see app.js for relevant code).

// 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(440, audioCtx.currentTime); // value in hertz
oscillator.start();

Specifications

Browser compatibility

See also

• Using the Web Audio API