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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/BaseAudioContext/createOscillator below:

BaseAudioContext: createOscillator() method - Web APIs

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The createOscillator() method of the BaseAudioContext interface creates an OscillatorNode, a source representing a periodic waveform. It basically generates a constant tone.

Note: The OscillatorNode() constructor is the recommended way to create a OscillatorNode; see Creating an AudioNode.

None.

An OscillatorNode.

The following example shows basic usage of an AudioContext to create an oscillator node. For applied examples/information, check out our Violent Theremin demo (see app.js for relevant code); also see our OscillatorNode page for more information.

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

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

oscillator.type = "square";
oscillator.frequency.setValueAtTime(3000, audioCtx.currentTime); // value in hertz
oscillator.connect(audioCtx.destination);
oscillator.start();

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