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OscillatorNode: frequency property

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

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

Value

Examples

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).

js

// create web audio api context
const audioCtx = new (window.AudioContext || window.webkitAudioContext)();

// create Oscillator node
const 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 4.4 25 25 14 6 1.5

See also

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https://developer.mozilla.org/en-US/docs/Web/API/OscillatorNode/frequency