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

The SpeechSynthesis interface of the Web Speech API is the controller interface for the speech service; this can be used to retrieve information about the synthesis voices available on the device, start and pause speech, and other commands besides.

Properties

SpeechSynthesis also inherits properties from its parent interface, EventTarget.

SpeechSynthesis.paused Read only
A Boolean that returns true if the SpeechSynthesis object is in a paused state.
SpeechSynthesis.pending Read only
A Boolean that returns true if the utterance queue contains as-yet-unspoken utterances.
SpeechSynthesis.speaking Read only
A Boolean that returns true if an utterance is currently in the process of being spoken — even if SpeechSynthesis is in a paused state.

Event handlers

SpeechSynthesis.onvoiceschanged
Fired when the list of SpeechSynthesisVoice objects that would be returned by the SpeechSynthesis.getVoices() method has changed.

Methods

SpeechSynthesis also inherits methods from its parent interface, EventTarget.

SpeechSynthesis.cancel()
Removes all utterances from the utterance queue.
SpeechSynthesis.getVoices()
Returns a list of SpeechSynthesisVoice objects representing all the available voices on the current device.
SpeechSynthesis.pause()
Puts the SpeechSynthesis object into a paused state.
SpeechSynthesis.resume()
Puts the SpeechSynthesis object into a non-paused state: resumes it if it was already paused.
SpeechSynthesis.speak()
Adds an utterance to the utterance queue; it will be spoken when any other utterances queued before it have been spoken.

Examples

In our basic Speech synthesiser demo, we first grab a reference to the SpeechSynthesis controller using window.speechSynthesis. After defining some necessary variables, we retrieve a list of the voices available using SpeechSynthesis.getVoices() and populate a select menu with them so the user can choose what voice they want.

Inside the inputForm.onsubmit handler, we stop the form submitting with preventDefault(),  create a new SpeechSynthesisUtterance instance containing the text from the text <input>, set the utterance's voice to the voice selected in the <select> element, and start the utterance speaking via the SpeechSynthesis.speak() method.

var synth = window.speechSynthesis;

var inputForm = document.querySelector('form');
var inputTxt = document.querySelector('.txt');
var voiceSelect = document.querySelector('select');

var pitch = document.querySelector('#pitch');
var pitchValue = document.querySelector('.pitch-value');
var rate = document.querySelector('#rate');
var rateValue = document.querySelector('.rate-value');

var voices = [];

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);

  inputTxt.blur();
}

Specifications

Specification Status Comment
Web Speech API
The definition of 'SpeechSynthesis' in that specification.
Draft  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support33 Yes49 No217
cancel33 Yes49 No217
getVoices33 Yes49 No217
onvoiceschanged33 Yes49 No No No
pause33 Yes49 No217
paused33 Yes49 No217
pending33 Yes49 No217
resume33 Yes49 No217
speak33 Yes49 No217
speaking33 Yes49 No217
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support3333 Yes

62

61 — 621

No7.1 ?
cancel3333 Yes

62

61 — 621

No7.1 ?
getVoices3333 Yes

62

61 — 621

No7.1 ?
onvoiceschanged3333 Yes

62

61 — 621

No No ?
pause3333 Yes

62

61 — 621

No7.1 ?
paused3333 Yes

62

61 — 621

No7.1 ?
pending3333 Yes

62

61 — 621

No7.1 ?
resume3333 Yes

62

61 — 621

No7.1 ?
speak3333 Yes

62

61 — 621

No7.1 ?
speaking3333 Yes

62

61 — 621

No7.1 ?

1. From version 61 until version 62 (exclusive): this feature is behind the media.webspeech.synth.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

See also

ドキュメントのタグと貢献者

このページの貢献者: lucian95, abbycar, mkato, chrisdavidmills
最終更新者: lucian95,