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    OscillatorNode

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    The OscillatorNode interface represents a periodic waveform, like a sine wave. It is an AudioNode audio-processing module that causes a given frequency of sine wave to be created — in effect, a constant tone.

    An OscillatorNode is created using the AudioContext.createOscillator method. It always has exactly one output and no inputs, both with the same amount of channels. Its basic property defaults (see AudioNode for definitions) are:

    • Number of inputs: 0
    • Number of outputs: 1
    • Channel count mode: max
    • Channel count: 2 (not used in the default count mode)
    • Channel interpretation: speakers

    Properties

    Inherits properties from its parent, AudioNode.

    OscillatorNode.frequency
    An a-rate AudioParam representing the frequency of oscillation in hertz (though the AudioParam returned is read-only, the value it represents is not.)
    OscillatorNode.detune
    An a-rate AudioParam representing detuning of oscillation in cents (though the AudioParam returned is read-only, the value it represents is not.)
    OscillatorNode.type
    Represents the shape of the oscillator wave generated. Different waves will produce different tones.

    Methods

    Inherits methods from its parent, AudioNode.

    OscillatorNode.start()
    This method specifies the exact time to start playing the tone.
    OscillatorNode.stop()
    This method specifies the exact time to stop playing the tone.
    OscillatorNode.setPeriodicWave()
    Used to point to a PeriodicWave defining a periodic waveform that can be used to shape the oscillator's output, when type = "custom" is used. This replaces the now-obsolete OscillatorNode.setWaveTable.

    Event handlers

    OscillatorNode.onended
    Used to set the event handler for the ended event, which fires when the tone has stopped playing.

    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
    var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
    
    // create Oscillator node
    var oscillator = audioCtx.createOscillator();
    
    oscillator.type = 'square';
    oscillator.frequency.value = 3000; // value in hertz
    oscillator.start();

    Specifications

    Specification Status Comment
    Web Audio API
    The definition of 'OscillatorNode' 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

     

    ドキュメントのタグと貢献者

    Contributors to this page: kscarfone, teoli, bradleymeck, chrisdavidmills
    最終更新者: teoli,