stop.cs

private void StopRecordingAndRecognition(AVAudioSession aVAudioSession = null)
        {
            if (_audioEngine.Running)
            {
                _audioEngine.Stop();
                _audioEngine.InputNode.RemoveTapOnBus(0);
                _recognitionTask?.Cancel();
                _recognitionRequest.EndAudio();
                _recognitionRequest = null;
                _recognitionTask = null;
            }


        }