SpeechRecognition: soundstart event

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

The soundstart event of the Web Speech API is fired when any sound — recognisable speech or not — has been detected.

Bubbles No
Cancelable No
Interface Event
Event handler property onsoundstart


You can use the soundstart event in an addEventListener method:

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

recognition.addEventListener('soundstart', function() { 
  console.log('Some sound is being received');

Or use the onsoundstart event handler property:

recognition.onsoundstart = function() { 
  console.log('Some sound is being received'); 


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

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
soundstart event
Chrome Full support 33Edge No support NoFirefox No support NoIE No support NoOpera No support NoSafari No support NoWebView Android Full support YesChrome Android Full support YesFirefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android ?


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

See also