OscillatorNode.frequency
The frequency
property of the OscillatorNode
interface is an a-rate AudioParam
representing the frequency of oscillation in hertz.
Syntax
var oscillator = audioCtx.createOscillator();
oscillator.frequency.setValueAtTime(440, audioCtx.currentTime); // value in hertz
Note: though the AudioParam
returned is read-only, the value it represents is not.
Value
An a-rate AudioParam
.
Example
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.setValueAtTime(440, audioCtx.currentTime); // value in hertz
oscillator.start();
Specifications
Specification | Status | Comment |
---|---|---|
Web Audio API The definition of 'frequency' in that specification. |
Working Draft |
Browser compatibility
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