Change Android Microphone Sensitivity For Speech Recognition

Question

I have an Android device (TV-Box, running Android 4.2) with an attached USB Microphone. I'm developing an Application which uses VoiceRecognition for that Android device and I want to change the microphone sensitivity.

How can I achieve this? In the Android settings under "Sound Input Devices", I can only change

• "mic input"
• "LineIn input"
• "usbaudio input"

but there is no way to set the sensitivity of the microphone. Is there an app that I can use? (Though I couldn't find any) Or can I do this somehow in the java code?

My voice-recognition class: (simplified)

public class VoiceCommandService extends Service {

    protected SpeechRecognizer mSpeechRecognizer;
    protected Intent mSpeechRecognizerIntent;

    @Override
    public void onCreate() {
        super.onCreate();

        mSpeechRecognizer = SpeechRecognizer.createSpeechRecognizer(this);
        mSpeechRecognizer.setRecognitionListener(new SpeechRecognitionListener());
        mSpeechRecognizerIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
        mSpeechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
                RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
        mSpeechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE,
                this.getPackageName());
        mSpeechRecognizerIntent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS,4);

    }
}