sS hVAD(S onVoiceStart, S onVoiceStop, bool autoStart) {

  ret hjs_createAudioMeter() +

    [[

<script type="text/javascript" src="https://botcompany.de/serve/]] + psI(#1027698) + [["></script>

<script type="text/javascript">

  var vadStarted = false, haveVoice = false;

  var vadStream;

  var audioMeter;

  var audioMeterClipLag = 5000;

  // Define function called by getUserMedia 

  function startUserMedia(stream) {

    vadStream = stream;

    // Create AudioContext

    window.AudioContext = window.AudioContext || window.webkitAudioContext;

    var audioContext = new AudioContext();

    // Create MediaStreamAudioSourceNode

    var source = audioContext.createMediaStreamSource(stream);

    // create audioMeter

    audioMeter = createAudioMeter(audioContext, null, null, audioMeterClipLag);

    source.connect(audioMeter);

    // Setup options

    var options = {

     source: source,

     voice_stop: function() { haveVoice = false; ]] + onVoiceStop + [[ }, 

     voice_start: function() { haveVoice = true; ]] + onVoiceStart + [[ }

    }; 

    // Create VAD

    var vad = new VAD(options);

  }

  function stopVAD() {

    if (!vadStarted) return;

    vadStarted = false;

    console.log("Stopping VAD");

    if (vadStream != undefined) {

      if (vadStream.active)

        vadStream.getTracks().forEach(function (track) { track.stop(); });

      vadStream = null;

    }

    if (audioMeter != undefined) {

      audioMeter.shutdown();

      audioMeter = null;

    }

  }

  function startVAD() {

    if (vadStarted) return;

    vadStarted = true;

    console.log("Starting VAD");

    // Ask for audio device

    navigator.getUserMedia = ( navigator.getUserMedia

                             || navigator.webkitGetUserMedia 

                             || navigator.mozGetUserMedia 

                             || navigator.msGetUserMedia);

    navigator.getUserMedia({audio: true}, startUserMedia, function(e) {

      console.log("No live audio input in this browser: " + e);

    });

  }

  function vadHasVoice() {

    return vadStarted && haveVoice;

  }

  function vadHasClipping() {

    return audioMeter && audioMeter.checkClipping();

  }

  ]] + (autoStart ? "startVAD();" : "") + [[

</script>

  ]];

}