Question

我正在使用内置于SpeechRecognizer和RecognizerIntent的android开发一款具有语音识别功能的应用。是否有任何可以集成到我的应用程序的降噪或噪音消除库，以提高语音识别的准确性？我在android中看到了一个NoiseSuppressor类，但我知道如何将它集成到SpeechRecognizer中。我是android编程领域的新手。提前致谢

public class MainActivity extends AppCompatActivity implements RecognitionListener {

private AudioRecord audioRecord;
private TextView returnedText;
private Button editButton;
private Button clearButton;
private ToggleButton toggleButton;
private ProgressBar progressBar;
private SpeechRecognizer speech ;
private Intent recognizerIntent, editIntent;
private String LOG_TAG = "MainActivity";

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

    //for noise suppressor checking
    int N = AudioRecord.getMinBufferSize(48000,AudioFormat.CHANNEL_IN_MONO,AudioFormat.ENCODING_PCM_16BIT);
    audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, 8000, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, N*10);
    int sessionId = audioRecord.getAudioSessionId();
    NoiseSuppressor noiseSuppresor = NoiseSuppressor.create(sessionId);

    if(noiseSuppresor == null){
        Toast.makeText(this, "No Suppersor", Toast.LENGTH_LONG).show();
    }else{
        Toast.makeText(this, "Have Suppersor", Toast.LENGTH_LONG).show();
    }

    returnedText = (TextView) findViewById(R.id.textView1);
    progressBar = (ProgressBar) findViewById(R.id.progressBar1);
    toggleButton = (ToggleButton) findViewById(R.id.toggleButton1);
    editButton = (Button)findViewById(R.id.button1);
    clearButton = (Button)findViewById(R.id.button2);

    progressBar.setVisibility(View.INVISIBLE);

    toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            initSpeech();
            if (isChecked) {
                progressBar.setVisibility(View.VISIBLE);
                progressBar.setIndeterminate(true);
                speech.startListening(recognizerIntent);
            } else {
                progressBar.setIndeterminate(false);
                progressBar.setVisibility(View.INVISIBLE);
                speech.stopListening();
            }
        }
    });

    clearButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            returnedText.setText("");
        }
    });

    editButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            editIntent = new Intent(MainActivity.this, EditorActivity.class);
            String forEditText = returnedText.getText().toString();
            editIntent.putExtra("forEdit", forEditText);
            startActivity(editIntent);
        }
    });


}

private void initSpeech(){

    speech = SpeechRecognizer.createSpeechRecognizer(this);
    speech.setRecognitionListener(this);
    recognizerIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
    recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE,"en");
    recognizerIntent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE, this.getPackageName());
    recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
    recognizerIntent.putExtra(RecognizerIntent.EXTRA_PARTIAL_RESULTS, true);
    recognizerIntent.putExtra(RecognizerIntent.EXTRA_PREFER_OFFLINE, true);
    recognizerIntent.putExtra("android.speech.extra.DICTATION_MODE", true);
    recognizerIntent.putExtra(RecognizerIntent.EXTRA_SPEECH_INPUT_POSSIBLY_COMPLETE_SILENCE_LENGTH_MILLIS, 5000);
}

@Override
public void onResume() {
    super.onResume();
}

@Override
protected void onPause() {
    super.onPause();
    if (speech != null) {
        speech.stopListening();
        speech.cancel();
        Log.i(LOG_TAG, "destroy");
    }


}

@Override
public void onBeginningOfSpeech() {
    Log.i(LOG_TAG, "onBeginningOfSpeech");
    progressBar.setIndeterminate(false);
    progressBar.setMax(10);
}

@Override
public void onBufferReceived(byte[] buffer) {
    Log.i(LOG_TAG, "onBufferReceived: " + buffer);
}

@Override
public void onEndOfSpeech() {
    Log.i(LOG_TAG, "onEndOfSpeech");
    progressBar.setIndeterminate(true);
    toggleButton.setChecked(false);
    speech.destroy();
}

@Override
public void onError(int errorCode) {
    String errorMessage = getErrorText(errorCode);
    Log.d(LOG_TAG, "FAILED " + errorMessage);
    returnedText.setText(errorMessage);
    toggleButton.setChecked(false);
    speech.destroy();
}

@Override
public void onEvent(int arg0, Bundle arg1) {
    Log.i(LOG_TAG, "onEvent");
}

@Override
public void onPartialResults(Bundle partialResults) {
    ArrayList<String> matches = partialResults
            .getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);
    String text = "";
    for (String result : matches)
        text += result + "\n";

    returnedText.setText(text);
}

@Override
public void onReadyForSpeech(Bundle arg0) {
    Log.i(LOG_TAG, "onReadyForSpeech");
}

@Override
public void onResults(Bundle results) {
    Log.i(LOG_TAG, "onResults");
    ArrayList<String> matches = results
            .getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);
    String text = "";
    for (String result : matches)
        text += result + "\n";

    returnedText.append(text);
    speech.destroy();
}

@Override
public void onRmsChanged(float rmsdB) {
    Log.i(LOG_TAG, "onRmsChanged: " + rmsdB);
    progressBar.setProgress((int) rmsdB);
}

public static String getErrorText(int errorCode) {
    String message;
    switch (errorCode) {
        case SpeechRecognizer.ERROR_AUDIO:
            message = "Audio recording error";
            break;
        case SpeechRecognizer.ERROR_CLIENT:
            message = "Client side error";
            break;
        case SpeechRecognizer.ERROR_INSUFFICIENT_PERMISSIONS:
            message = "Insufficient permissions";
            break;
        case SpeechRecognizer.ERROR_NETWORK:
            message = "Network error";
            break;
        case SpeechRecognizer.ERROR_NETWORK_TIMEOUT:
            message = "Network timeout";
            break;
        case SpeechRecognizer.ERROR_NO_MATCH:
            message = "No match";
            break;
        case SpeechRecognizer.ERROR_RECOGNIZER_BUSY:
            message = "RecognitionService busy";
            break;
        case SpeechRecognizer.ERROR_SERVER:
            message = "error from server";
            break;
        case SpeechRecognizer.ERROR_SPEECH_TIMEOUT:
            message = "No speech input";
            break;
        default:
            message = "Didn't understand, please try again.";
            break;
    }
    return message;
}

}

Answer 1

只需在AudioManager中添加“noise_suppression = on”：

yourAudioManager.setParameters("noise_suppression=on");

android - 用于Android的语音增强/噪音消除/降噪库

1 个答案: