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