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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.value = 440; // 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.value = 440; // value in hertz oscillator.start();
Specifications
| 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 | No support | 15 webkit 22 (unprefixed) |
6 webkit |
| Feature | Android | Chrome | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | No support | 28 webkit | 25 | 1.2 | No support | No support | 6 webkit |