private init(): void {
    this._supportRecognition = true;
    console.log(window['SpeechRecognition']);
    if (window['SpeechRecognition']) {
      this._speech = new SpeechRecognition();
    } else if (window['webkitSpeechRecognition']) {
      this._speech = new webkitSpeechRecognition();
    } else if(window['msSpeechRecognition']){
      this._speech = new msSpeechRecognition();
    } else {
      this._supportRecognition = false;
    }
    console.log(`Speech supported: ${this._supportRecognition}`);
  }