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

Browser compatibility

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See also