SST and TTS

SST : speech to text;　　TTS: text to speech;

*SST:

      var u = new SpeechSynthesisUtterance();
      u.text = 'The quick brown chrome jumps over the lazy dog';
      u.lang = 'en-AU';
      u.rate = 0.75;
      u.pitch = 2.0;
      u.volume = 0.5;
      window.speechSynthesis.speak(u);     

*TTS:

<script>
if (!('webkitSpeechRecognition' in window)) {
  upgrade();
} else {
  start_button.style.display = 'inline-block';
  var recognition = new webkitSpeechRecognition();
  recognition.continuous = true;
  recognition.interimResults = true;
  recognition.onstart = function() {
    recognizing = true;
    showInfo('info_speak_now');
    start_img.src = 'mic-animate.gif';
  };
  recognition.onerror = function(event) {
    if (event.error == 'no-speech') {
      start_img.src = 'mic.gif';
      showInfo('info_no_speech');
      ignore_onend = true;
    }
    if (event.error == 'audio-capture') {
      start_img.src = 'mic.gif';
      showInfo('info_no_microphone');
      ignore_onend = true;
    }
    if (event.error == 'not-allowed') {
      if (event.timeStamp - start_timestamp < 100) {
        showInfo('info_blocked');
      } else {
        showInfo('info_denied');
      }
      ignore_onend = true;
    }
  };
  recognition.onend = function() {
    recognizing = false;
    if (ignore_onend) {
      return;
    }
    start_img.src = 'mic.gif';
    if (!final_transcript) {
      showInfo('info_start');
      return;
    }
    showInfo('');
    if (window.getSelection) {
      window.getSelection().removeAllRanges();
      var range = document.createRange();
      range.selectNode(document.getElementById('final_span'));
      window.getSelection().addRange(range);
    }
    if (create_email) {
      create_email = false;
      createEmail();
    }
  };
  recognition.onresult = function(event) {
    var interim_transcript = '';
    for (var i = event.resultIndex; i < event.results.length; ++i) {
      if (event.results[i].isFinal) {
        final_transcript += event.results[i][0].transcript;
      } else {
        interim_transcript += event.results[i][0].transcript;
      }
    }
    final_transcript = capitalize(final_transcript);
    final_span.innerHTML = linebreak(final_transcript);
    interim_span.innerHTML = linebreak(interim_transcript);
    if (final_transcript || interim_transcript) {
      showButtons('inline-block');
    }
  };
}
function upgrade() {
  start_button.style.visibility = 'hidden';
  showInfo('info_upgrade');
}
</script>