SpeechRecognition: speechstart event

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  1. Examples
  2. Specifications
  3. Browser compatibility
  4. See also

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The speechstart event of the Web Speech API is fired when sound recognized by the speech recognition service as speech has been detected.

Bubbles No
Cancelable No
Interface Event
Event handler property onspeechstart

Examples

You can use the speechstart event in an addEventListener method:

var recognition = new webkitSpeechRecognition() || new SpeechRecognition();

recognition.addEventListener('speechstart', function() { 
  console.log('Speech has been detected');
});

Or use the onspeechstart event handler property:

recognition.onspeechstart = function() { 
  console.log('Speech has been detected'); 
}

Specifications

Specification Status Comment
Web Speech API
The definition of 'speech recognition events' in that specification.		 Draft  

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!
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.

See also

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Contributors to this page: fscholz, chrisdavidmills
Last updated by: fscholz,