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


    var oscillator = audioCtx.createOscillator();
    oscillator.frequency.value = 3000; // value in hertz

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


    An a-rate AudioParam.


    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.value = 3000; // value in hertz


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

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support 14 webkit 23 Not supported 15 webkit
    22 (unprefixed)
    6 webkit
    Feature Android Chrome Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
    Basic support Not supported 28 webkit 25 1.2 Not supported Not supported webkit

    See also


    Document Tags and Contributors

    Contributors to this page: fscholz, chrisdavidmills
    Last updated by: fscholz,