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

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

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/OscillatorNode/frequency