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

An a-rate AudioParam.

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

Specification
Web Audio API
# dom-oscillatornode-frequency

Browser compatibility

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See also