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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The speechstart event of the Web Speech API is fired when sound recognised by the speech recognition service as speech has been detected.
| Bubbles | No |
| Cancelable | No |
| Target objects | SpeechRecognition |
| Interface | Event |
Examples
var recognition = new SpeechRecognition();
recognition.onspeechstart = function() {
console.log('Speech has been detected');
}
Inheritance
The speechstart event implements the Event interface — it has available the properties and methods defined on this interface.
Specifications
| Specification | Status | Comment |
|---|---|---|
| Web Speech API The definition of 'speech recognition events' in that specification. |
Draft |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 33 [1] | 44 (44) [2] | No support | No support | No support |
| Feature | Android | Chrome | Firefox Mobile (Gecko) | Firefox OS | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | ? | (Yes)[1] | ? | 2.5 | No support | No support | No support |
- [1] Speech recognition interfaces are currently prefixed on Chrome, so you'll need to prefix interface names appropriately, e.g.
webkitSpeechRecognition; You'll also need to serve your code through a web server for recognition to work. - [2] Can be enabled via the
media.webspeech.recognition.enableflag in about:config, although note that currently speech recognition won't work on Desktop Firefox — it will be properly exposed soon, once the required internal permissions are sorted out.
Firefox OS permissions
To use speech recognition in an app, you need to specify the following permissions in your manifest:
"permissions": {
"audio-capture" : {
"description" : "Audio capture"
},
"speech-recognition" : {
"description" : "Speech recognition"
}
}
You also need a privileged app, so you need to include this as well:
"type": "privileged"