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              <h1>HTML5 -音声関係のAPIの実験-</h1>
<p>音声認識は Google Chrome のみ。合成音声は Google Chrome または Microsoft Edge で利用できる。</p>
<div id="container">
  <input type="button" id="recognitionStart" value="音声認識を開始" onclick="recognition_start();" />
  <input type="button" id="recognitionEnd" value="音声認識を終了" onclick="recognition_stop();" />
  <textarea id="results"> </textarea>
  <input type="button" value="合成音声で結果を話す" onclick="say()" />
  <input type="button" value="話を中断する" onclick="speech_pause()" /> <input type="button" value="話を再開する" onclick="speech_resume()" />
  <div id="voice_settings">
    <div><label for="volume">Volume</label>
      <input type="range" min="0" max="1" value="0.5" step="0.1" id="volume" /><span class="volume-value">1</span>
      <p>volume 属性は 0 から 1 までで指定できる 1 が最大。0が最小</p>
    </div>
    <div><label for="rate">Rate</label>
      <input type="range" min="0.5" max="10" value="1" step="0.1" id="rate" /><span class="rate-value">1</span>
    </div>
    <p>rate 属性は話す速度を調整し、 1 が既定であり、一般的な話す速度。2は2倍の速度。0.5 は半分の速度となる。0.1 以下または10以上はサポートされない</p>
    <div>
      <label for="pitch">Pitch</label>
      <input type="range" min="0" max="2" value="1" step="0.1" id="pitch" /><span class="pitch-value">1</span>
    </div>
    <p>pitch 属性は声の高さを調整し、0から2までの範囲をとる。0が最低ピッチ。2が最高ピッチ。1が既定。</p>
  </div>
  <select id="voice_language"></select><select id="language"><option value="ja-jp">ja-jp(日本)</option><option value="en-us">en-us(米国)</option></select>
  <p>Edge の場合は日本語音声を選ぶ必要がある。Chromeはその言語が対応していれば、
読み上げてくれる</p>
</div>
            
          
!
            
              html{font-family:'YuGothicUI','Meiryo UI',sans-serif;}
#container >input{margin-bottom:4px;margin-top:4px;padding:4px 8px; border:1px solid #eee;display:inline-block;transition:all 200ms ease-out;}
#container >input:hover:enabled,#container >input:hover:active:enabled{
    background-color:hsl(219, 94%, 76%);
    color:#fff;
    box-shadow:0 0 3px #6d6a93;
}
#container textarea{width: 500px;height: 30vh; display:block;}
#voice_settings > div> input[type='range']{width: 400px;}
#container > select{height: 2em;margin: 4px;}
#container .rate-value,#container .pitch-value{display: inline-block;padding: 4px 8px;}
#container  p{font-size:0.8em;}
#container p:before{content:"→";padding-right:4px;}
            
          
!
            
              var recognition, result, synth, voices = [],
  voiceSelect, pitch, rate, utterThis;
$(function() {
  //ブラウザーがwebkitSppechRecognition に対応しているか判定
  if ("webkitSpeechRecognition" in window) {
    recognition = new webkitSpeechRecognition(); //Google Chrome のみ対応
    recognition.lang ="ja-jp"; // 日本語認識
    recognition.continuous = true;
    recognition.addEventListener('result', function(event) {      
      var text = '';
      for (var i = 0; i < event.results.length; i++) {
        text += event.results[i][0].transcript;
      }
      results.val(text); //テキストボックスに書き込む
    }, false);
  } else {
    $("#recognitionStart").attr("disabled", true);
    $("#recognitionEnd").attr("disabled", true);
  }

  results = $('#results');
  //音声の種類の列挙
  voiceSelect = $("select#voice_language");
  $("#volume").change(function() {
    $(".volume-value").text($("#volume").val());
  });
  $("#rate").change(function() {
    $(".rate-value").text($("#rate").val());
  });
  $("#pitch").change(function() {
    $(".pitch-value").text($("#pitch").val());
  });
  synth = window.speechSynthesis;
  populateVoiceList();

  if (speechSynthesis.onvoiceschanged !== undefined || voiceSelect.val() == "") {
    speechSynthesis.onvoiceschanged = populateVoiceList;
  }
});

function recognition_start() {
  results.val(""); //テキストボックスをクリア
  recognition.start();
}

function recognition_stop() {
  recognition.stop();
}

function say() {
  //Microsoft Edge と Chrome が対応
  utterThis = new SpeechSynthesisUtterance(results.val());
  utterThis.lang=$("select#language").val();
  utterThis.volume = parseFloat($("#volume").val());
  utterThis.pitch = parseFloat($("#pitch").val());
  utterThis.rate = parseFloat($("#rate").val());
 
  var selectedOption = voiceSelect.find('option:selected').attr('data-name');

  for (i = 0; i < voices.length; i++) {
    if (voices[i].name === selectedOption) {
      utterThis.voice = voices[i];
    }
  }
  synth.speak(utterThis); //話す	
}

function speech_pause() { 
  synth.pause();
}
function speech_resume() { 
  synth.resume();
}

function populateVoiceList() {
  if (voices.length > 0) return;
  voices = synth.getVoices();
  console.log(voices.length);
  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 += ' -- 既定';
    }
    option.setAttribute('data-lang', voices[i].lang);
    option.setAttribute('data-name', voices[i].name);
    voiceSelect.append(option);
  }
}
            
          
!
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