SpeechSynthesisVoice

The SpeechSynthesisVoice interface of the Web Speech API represents a voice that the system supports. Every SpeechSynthesisVoice has its own relative speech service including information about language, name and URI.

Properties

SpeechSynthesisVoice.default Read only

A Boolean indicating whether the voice is the default voice for the current app language (true), or not (false.)

SpeechSynthesisVoice.lang Read only

Returns a BCP 47 language tag indicating the language of the voice.

SpeechSynthesisVoice.localService Read only

A Boolean indicating whether the voice is supplied by a local speech synthesizer service (true), or a remote speech synthesizer service (false.)

SpeechSynthesisVoice.name Read only

Returns a human-readable name that represents the voice.

SpeechSynthesisVoice.voiceURI Read only

Returns the type of URI and location of the speech synthesis service for this voice.

Examples

The following snippet is excerpted from our Speech synthesiser demo.

function populateVoiceList() {
  voices = synth.getVoices();

  for(i = 0; i < voices.length ; i++) {
    var option = document.createElement('option');
    option.textContent = voices[i].name + ' (' + voices[i].lang + ')';
    
    if(voices[i].default) {
      option.textContent += ' -- DEFAULT';
    }

    option.setAttribute('data-lang', voices[i].lang);
    option.setAttribute('data-name', voices[i].name);
    voiceSelect.appendChild(option);
  }
}

populateVoiceList();
if (speechSynthesis.onvoiceschanged !== undefined) {
  speechSynthesis.onvoiceschanged = populateVoiceList;
}

inputForm.onsubmit = function(event) {
  event.preventDefault();

  var utterThis = new SpeechSynthesisUtterance(inputTxt.value);
  var selectedOption = voiceSelect.selectedOptions[0].getAttribute('data-name');
  for(i = 0; i < voices.length ; i++) {
    if(voices[i].name === selectedOption) {
      utterThis.voice = voices[i];
    }
  }
  utterThis.pitch = pitch.value;
  utterThis.rate = rate.value;
  synth.speak(utterThis);

  utterThis.onpause = function(event) {
    var char = event.utterance.text.charAt(event.charIndex);
    console.log('Speech paused at character ' + event.charIndex + ' of "' +
    event.utterance.text + '", which is "' + char + '".');
  }

  inputTxt.blur();
}

Specifications

Browser compatibility

• [1] Can be enabled via the media.webspeech.synth.enabled flag in about:config.

See also

• Web Speech API