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 at the point in time specified by when
Parameters
- when Optional
- An optional double representing the time (in seconds) when the oscillator should start, in the same coordinate system as
AudioContext
'scurrentTime
attribute. If a value is not included or is less thancurrentTime
, 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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
start | Chrome Full support 14 | Edge Full support 12 | Firefox
Full support
25
| IE No support No | Opera Full support 15 | Safari Full support 6 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android
Full support
26
| Opera Android Full support 14 | Safari iOS ? | Samsung Internet Android Full support 1.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- See implementation notes.
- See implementation notes.