speechstart

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

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.enable flag 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"

Examples

Inheritance

Specifications

Browser compatibility

Firefox OS permissions

See also

Document Tags and Contributors