The start
method of the OscillatorNode
interface specifies the exact time to start playing the tone. Its parameter is optional and default to 0
.
Syntax
oscillator.start(when); // start playing oscillator in when seconds
Parameters
- when Optional
- An optional double representing the time when the oscillator should start. If a value is not included or is in the past, the oscillator starts playing immediately.
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(3000, audioCtx.currentTime); // value in hertz oscillator.start();
Specifications
Specification | Status | Comment |
---|---|---|
Web Audio API The definition of 'start' in that specification. |
Working Draft |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 14 | Yes | 251 | No | 15 | 6 |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | Yes | 14 | Yes | 261 | No | 15 | ? |
1. Before Firefox 30, the when
parameter was not optional.