Обнаружение голосовой активности Android Audio Record

Как реализовать обнаружение голосовой активности для голосового сигнала, полученного в виде массива байтов. Как проверить, есть ли в полученном сигнале речь или нет? Текущая реализация кода Android, который получает звук в виде массива байтов:

 public class AudioRecordActivity extends AppCompatActivity {

    private static final int RECORDER_BPP = 16;
    private static final int RECORDER_SAMPLERATE = 8000;
    private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_STEREO;
    private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
    short[] audioData;
    int[] bufferData;
    int bytesRecorded;
    private AudioRecord recorder = null;
    private int bufferSize = 0;
    private Thread recordingThread = null;
    private boolean isRecording = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_audio_record);


        ActivityCompat.requestPermissions(AudioRecordActivity.this,
                new String[]{Manifest.permission.RECORD_AUDIO},
                1);


        Button startRecording = (Button) findViewById(R.id.startRecording);
        bufferSize = AudioRecord.getMinBufferSize
                (RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING) * 3;

        audioData = new short[bufferSize]; //short array that pcm data is put into.
        Toast.makeText(this, "buffer size"+bufferSize, Toast.LENGTH_SHORT).show();

    }

    public void startRecording(View view) {
        recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
                RECORDER_SAMPLERATE,
                RECORDER_CHANNELS,
                RECORDER_AUDIO_ENCODING,
                bufferSize);
        int i = recorder.getState();
        if (i == 1)
            recorder.startRecording();

        isRecording = true;

        recordingThread = new Thread(new Runnable() {
            @Override
            public void run() {
                writeAudioDataToFile();
            }
        }, "AudioRecorder Thread");

        recordingThread.start();
    }

    public void stopRecording(View view) {
        if (null != recorder) {
            isRecording = false;

            int i = recorder.getState();
            if (i == 1)
                recorder.stop();
            recorder.release();

            recorder = null;
            recordingThread = null;
        }
    }

    private void writeAudioDataToFile() {
        byte data[] = new byte[bufferSize];



        int read = 0;
        while (isRecording) {
            read = recorder.read(data, 0, bufferSize);
           /* if (read > 0) {
            }

            if (AudioRecord.ERROR_INVALID_OPERATION != read) {
                try {
                    os.write(data);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }*/
            Log.d("buffersize", bufferSize + "");
            Log.d("data", Arrays.toString(data));
        }



    }


    }
}

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