android語音錄音 - 語音背景聲音問題

Question

我正在開發語音錄音android應用程序。爲此，我使用下面的代碼。當我錄製和播放時，我正在錄製帶背景聲音的聲音。我怎麼才能得到錄音的聲音。誰能幫我？

import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 

import android.app.Activity; 
import android.media.AudioFormat; 
import android.media.AudioRecord; 
import android.media.MediaRecorder; 
import android.os.Bundle; 
import android.os.Environment; 
import android.view.View; 
import android.widget.Button; 

public class RecorderActivity extends Activity { 
     private static final int RECORDER_BPP = 16; 
     private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".wav"; 
     private static final String AUDIO_RECORDER_FOLDER = "AudioRecorder"; 
     private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw"; 
     private static final int RECORDER_SAMPLERATE = 44100; 
     private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_STEREO; 
     private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT; 

     private AudioRecord recorder = null; 
     private int bufferSize = 0; 
     private Thread recordingThread = null; 
     private boolean isRecording = false; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     setButtonHandlers(); 
     enableButtons(false); 

     bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING); 
    } 

     private void setButtonHandlers() { 
       ((Button)findViewById(R.id.btnStart)).setOnClickListener(btnClick); 
     ((Button)findViewById(R.id.btnStop)).setOnClickListener(btnClick); 
     } 

     private void enableButton(int id,boolean isEnable){ 
       ((Button)findViewById(id)).setEnabled(isEnable); 
     } 

     private void enableButtons(boolean isRecording) { 
       enableButton(R.id.btnStart,!isRecording); 
       enableButton(R.id.btnStop,isRecording); 
     } 

     private String getFilename(){ 
       String filepath = Environment.getExternalStorageDirectory().getPath(); 
       File file = new File(filepath,AUDIO_RECORDER_FOLDER); 

       if(!file.exists()){ 
         file.mkdirs(); 
       } 

       return (file.getAbsolutePath() + "/" + System.currentTimeMillis() + AUDIO_RECORDER_FILE_EXT_WAV); 
     } 

     private String getTempFilename(){ 
       String filepath = Environment.getExternalStorageDirectory().getPath(); 
       File file = new File(filepath,AUDIO_RECORDER_FOLDER); 

       if(!file.exists()){ 
         file.mkdirs(); 
       } 

       File tempFile = new File(filepath,AUDIO_RECORDER_TEMP_FILE); 

       if(tempFile.exists()) 
         tempFile.delete(); 

       return (file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE); 
     } 

     private void startRecording(){ 
       recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, 
               RECORDER_SAMPLERATE, RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING, bufferSize); 

       recorder.startRecording(); 

       isRecording = true; 

       recordingThread = new Thread(new Runnable() { 

         @Override 
         public void run() { 
           writeAudioDataToFile(); 
         } 
       },"AudioRecorder Thread"); 

       recordingThread.start(); 
     } 

     private void writeAudioDataToFile(){ 
       byte data[] = new byte[bufferSize]; 
       String filename = getTempFilename(); 
       FileOutputStream os = null; 

       try { 
         os = new FileOutputStream(filename); 
       } catch (FileNotFoundException e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 
       } 

       int read = 0; 

       if(null != os){ 
         while(isRecording){ 
           read = recorder.read(data, 0, bufferSize); 

           if(AudioRecord.ERROR_INVALID_OPERATION != read){ 
             try { 
               os.write(data); 
             } catch (IOException e) { 
               e.printStackTrace(); 
             } 
           } 
         } 

         try { 
           os.close(); 
         } catch (IOException e) { 
           e.printStackTrace(); 
         } 
       } 
     } 

     private void stopRecording(){ 
       if(null != recorder){ 
         isRecording = false; 

         recorder.stop(); 
         recorder.release(); 

         recorder = null; 
         recordingThread = null; 
       } 

       copyWaveFile(getTempFilename(),getFilename()); 
       deleteTempFile(); 
     } 

     private void deleteTempFile() { 
       File file = new File(getTempFilename()); 

       file.delete(); 
     } 

     private void copyWaveFile(String inFilename,String outFilename){ 
       FileInputStream in = null; 
       FileOutputStream out = null; 
       long totalAudioLen = 0; 
       long totalDataLen = totalAudioLen + 36; 
       long longSampleRate = RECORDER_SAMPLERATE; 
       int channels = 2; 
       long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels/8; 

       byte[] data = new byte[bufferSize]; 

       try { 
         in = new FileInputStream(inFilename); 
         out = new FileOutputStream(outFilename); 
         totalAudioLen = in.getChannel().size(); 
         totalDataLen = totalAudioLen + 36; 

         AppLog.logString("File size: " + totalDataLen); 

         WriteWaveFileHeader(out, totalAudioLen, totalDataLen, 
             longSampleRate, channels, byteRate); 

         while(in.read(data) != -1){ 
           out.write(data); 
         } 

         in.close(); 
         out.close(); 
       } catch (FileNotFoundException e) { 
         e.printStackTrace(); 
       } catch (IOException e) { 
         e.printStackTrace(); 
       } 
     } 

     private void WriteWaveFileHeader(
         FileOutputStream out, long totalAudioLen, 
         long totalDataLen, long longSampleRate, int channels, 
         long byteRate) throws IOException { 

       byte[] header = new byte[44]; 

       header[0] = 'R'; // RIFF/WAVE header 
       header[1] = 'I'; 
       header[2] = 'F'; 
       header[3] = 'F'; 
       header[4] = (byte) (totalDataLen & 0xff); 
       header[5] = (byte) ((totalDataLen >> 8) & 0xff); 
       header[6] = (byte) ((totalDataLen >> 16) & 0xff); 
       header[7] = (byte) ((totalDataLen >> 24) & 0xff); 
       header[8] = 'W'; 
       header[9] = 'A'; 
       header[10] = 'V'; 
       header[11] = 'E'; 
       header[12] = 'f'; // 'fmt ' chunk 
       header[13] = 'm'; 
       header[14] = 't'; 
       header[15] = ' '; 
       header[16] = 16; // 4 bytes: size of 'fmt ' chunk 
       header[17] = 0; 
       header[18] = 0; 
       header[19] = 0; 
       header[20] = 1; // format = 1 
       header[21] = 0; 
       header[22] = (byte) channels; 
       header[23] = 0; 
       header[24] = (byte) (longSampleRate & 0xff); 
       header[25] = (byte) ((longSampleRate >> 8) & 0xff); 
       header[26] = (byte) ((longSampleRate >> 16) & 0xff); 
       header[27] = (byte) ((longSampleRate >> 24) & 0xff); 
       header[28] = (byte) (byteRate & 0xff); 
       header[29] = (byte) ((byteRate >> 8) & 0xff); 
       header[30] = (byte) ((byteRate >> 16) & 0xff); 
       header[31] = (byte) ((byteRate >> 24) & 0xff); 
       header[32] = (byte) (2 * 16/8); // block align 
       header[33] = 0; 
       header[34] = RECORDER_BPP; // bits per sample 
       header[35] = 0; 
       header[36] = 'd'; 
       header[37] = 'a'; 
       header[38] = 't'; 
       header[39] = 'a'; 
       header[40] = (byte) (totalAudioLen & 0xff); 
       header[41] = (byte) ((totalAudioLen >> 8) & 0xff); 
       header[42] = (byte) ((totalAudioLen >> 16) & 0xff); 
       header[43] = (byte) ((totalAudioLen >> 24) & 0xff); 

       out.write(header, 0, 44); 
     } 

     private View.OnClickListener btnClick = new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
         switch(v.getId()){ 
           case R.id.btnStart:{ 
             AppLog.logString("Start Recording"); 

             enableButtons(true); 
             startRecording(); 

             break; 
           } 
           case R.id.btnStop:{ 
             AppLog.logString("Start Recording"); 

             enableButtons(false); 
             stopRecording(); 

             break; 
           } 
         } 
       } 
     }; 
} 

Answer 1

您是使用模擬器還是在實際設備上（如果是這樣，哪個設備）測試它？聲學調諧（包括增益控制，降噪等）將針對特定的平臺和產品，而不是您可以更改的內容。

軟糖包括允許應用程序在記錄中應用某些聲學過濾器的API，而noise suppressor就是其中之一。但是，通過使用該API，您將限制您的應用只能在運行Jellybean或更高版本的設備上正常運行（甚至不是所有這些設備都可能實際實現此功能）。

另一種可能是將噪聲抑制器包含在您的應用中。我想，例如Speex包含噪聲抑制功能，但它適用於低比特率的語音編碼。

Answer 2

如果你想NoiseSuppressor那麼你可以使用這個：

//下面將採取只對果凍豆和更高的效果。

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { 
     Log.i("Trying to clean up audio because running on SDK " + Build.VERSION.SDK_INT); 

    if (noise && NoiseSuppressor.create(getAudioSessionId()) == null) { 
     Log.i("NoiseSuppressor not present :("); 
    } else { 
     Log.i("NoiseSuppressor enabled!"); 
    } 

    if (gain && AutomaticGainControl.create(getAudioSessionId()) == null) { 
     Log.i("AutomaticGainControl not present :("); 
    } else { 
     Log.i("AutomaticGainControl enabled!"); 
    } 

    if (echo && AcousticEchoCanceler.create(getAudioSessionId()) == null) { 
     Log.i("AcousticEchoCanceler not present :("); 
    } else { 
     Log.i("AcousticEchoCanceler enabled!"); 
    } 
} 

此代碼可以消除背景噪音，回聲和增益。