OscillatorNode.start()
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
No compatibility data found for api.OscillatorNode.start
.
Check for problems with this page or contribute missing data to mdn/browser-compat-data.