OscillatorNode.frequency

The frequency property of the OscillatorNode interface is an a-rate AudioParam representing the frequency of oscillation in hertz.

Syntax

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

Note: though the AudioParam returned is read-only, the value it represents is not.

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

Specification
Web Audio API # dom-oscillatornode-frequency

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
`frequency`	20	12	25	No	15	6	≤37	25	25	14	6	1.5