private void startAudio() { var audioSource = this.sensor.AudioSource; audioSource.BeamAngleMode = BeamAngleMode.Adaptive; // This should be off by default, but just to be explicit, this MUST be set to false. audioSource.AutomaticGainControlEnabled = false; var kinectStream = audioSource.Start(); this.preSpeechRecognizer.SetInputToAudioStream( kinectStream, new SpeechAudioFormatInfo(EncodingFormat.Pcm, 16000, 16, 1, 32000, 2, null)); // Keep recognizing speech until window closes this.preSpeechRecognizer.RecognizeAsync(RecognizeMode.Multiple); this.postSpeechRecognizer.SetInputToAudioStream( kinectStream, new SpeechAudioFormatInfo(EncodingFormat.Pcm, 16000, 16, 1, 32000, 2, null)); // Keep recognizing speech until window closes this.postSpeechRecognizer.RecognizeAsync(RecognizeMode.Multiple); sensor = (from sensorToCheck in KinectSensor.KinectSensors where sensorToCheck.Status == KinectStatus.Connected select sensorToCheck).FirstOrDefault(); sensor.Start(); source = sensor.AudioSource; source.EchoCancellationMode = EchoCancellationMode.None; // No AEC for this sample source.AutomaticGainControlEnabled = false; // Important to turn this off for speech recognition ri = System.Speech.Recognition.SpeechRecognitionEngine.InstalledRecognizers().FirstOrDefault(); recoEngine = new System.Speech.Recognition.SpeechRecognitionEngine(ri.Id); customDictationGrammar = new System.Speech.Recognition.DictationGrammar(); customDictationGrammar.Name = "Dictation"; customDictationGrammar.Enabled = true; recoEngine.LoadGrammar(customDictationGrammar); recoEngine.SpeechRecognized += new EventHandler<System.Speech.Recognition.SpeechRecognizedEventArgs>(recoEngine_SpeechRecognized); s = source.Start(); recoEngine.SetInputToAudioStream(s, new System.Speech.AudioFormat.SpeechAudioFormatInfo(System.Speech.AudioFormat.EncodingFormat.Pcm, 16000, 16, 1, 32000, 2, null)); recoEngine.RecognizeAsync(System.Speech.Recognition.RecognizeMode.Multiple); }