SpeechRecognition: soundstart event

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


Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener('soundstart', (event) => { })

onsoundstart = (event) => { }

Event type

A generic Event with no added properties.


You can use the soundstart event in an addEventListener method:

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

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

Or use the onsoundstart event handler property:

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


Web Speech API
# eventdef-speechrecognition-soundstart
Web Speech API
# dom-speechrecognition-onsoundstart

Browser compatibility

BCD tables only load in the browser

See also