OscillatorNode: frequency property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨July 2015⁩.

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).

// create web audio api context
const audioCtx = new AudioContext();

// create Oscillator node
const oscillator = audioCtx.createOscillator();

oscillator.type = "square";
oscillator.frequency.setValueAtTime(440, audioCtx.currentTime); // value in hertz
oscillator.start();