क्या हम एंड्रॉइड फोन के माइक के लाभ को बढ़ा सकते हैं?

Question

मैं एंड्रॉइड फोन के माइक के लाभ को बढ़ाने की कोशिश कर रहा हूं ताकि वह बहुत ही मिनट की आवाज़ सुनने में सक्षम हो। क्या यह संभव है? कृपा करके आप इस बारे में मेरी मदद कर सकते हैं।

Answer 1

this link आपको आगे ले जाना चाहिए। वॉल्यूम उच्च सेट करने के लिए setStreamVolume (...) का उपयोग करें। लेकिन ध्यान दें कि getStreamMaxVolume (...) को कॉल करके अधिकतम अधिकतम पूछा जा सकता है। इसलिए माइक लाभ शायद हार्डवेयर द्वारा सीमित है जो मुझे लगता है। तो यह "ऑन-फ्लाई" करना संभव नहीं है, लेकिन थोड़ा रिकॉर्डिंग के बारे में क्या है, equalizer द्वारा विशेष आवृत्ति को बढ़ाने की कोशिश कर रहा है और फिर दिल की धड़कन की तरह कुछ पहचान सकता है? मुश्किल लगता है लेकिन शायद संभव है।

Answer 2

ऑडियो लाभ नियंत्रण

public class MainActivity extends Activity { 

public static final int SAMPLE_RATE = 16000; 

private AudioRecord mRecorder; 
private File mRecording; 
private short[] mBuffer; 
private final String startRecordingLabel = "Start recording"; 
private final String stopRecordingLabel = "Stop recording"; 
private boolean mIsRecording = false; 
private ProgressBar mProgressBar; 
float iGain = 1.0f; 
CheckBox gain; 

protected int bitsPerSamples = 16; 

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

    initRecorder(); 

    Button bluetooth = (Button)findViewById(R.id.blue); 
    gain = (CheckBox) findViewById(R.id.checkBox1); 
    mProgressBar = (ProgressBar) findViewById(R.id.progressBar); 

    final Button button = (Button) findViewById(R.id.start); 
    button.setText(startRecordingLabel); 

    bluetooth.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      Intent i = new Intent(""); 
     } 
    }); 
    gain.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 

     @Override 
     public void onCheckedChanged(CompoundButton buttonView, 
       boolean isChecked) { 

      if (gain.isChecked()) { 
       iGain = 5.0f; 

      } else { 
       iGain = 2.0f; 
      } 
     } 
    }); 

    button.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(final View v) { 
      if (!mIsRecording) { 
       button.setText(stopRecordingLabel); 
       mIsRecording = true; 
       mRecorder.startRecording(); 
       mRecording = getFile("raw"); 
       startBufferedWrite(mRecording); 
      } else { 
       button.setText(startRecordingLabel); 
       mIsRecording = false; 
       mRecorder.stop(); 
       File waveFile = getFile("wav"); 
       try { 
        rawToWave(mRecording, waveFile); 
       } catch (IOException e) { 
        Toast.makeText(MainActivity.this, e.getMessage(), 
          Toast.LENGTH_SHORT).show(); 
       } 
       Toast.makeText(MainActivity.this, 
         "Recorded to " + waveFile.getName(), 
         Toast.LENGTH_SHORT).show(); 
      } 
     } 
    }); 
} 

@Override 
public void onDestroy() { 
    mRecorder.release(); 
    super.onDestroy(); 
} 

private void initRecorder() { 
    int bufferSize = AudioRecord.getMinBufferSize(SAMPLE_RATE, 
      AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT); 
    mBuffer = new short[bufferSize]; 
    mRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLE_RATE, 
      AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, 
      bufferSize); 
} 

private void startBufferedWrite(final File file) { 
    new Thread(new Runnable() { 
     @Override 
     public void run() { 
      DataOutputStream output = null; 
      try { 
       output = new DataOutputStream(new BufferedOutputStream(
         new FileOutputStream(file))); 
       while (mIsRecording) { 
        double sum = 0; 

        int readSize = mRecorder.read(mBuffer, 0, 
          mBuffer.length); 

        final int bytesPerSample = bitsPerSamples/8; 
        final int emptySpace = 64 - bitsPerSamples; 
        int byteIndex = 0; 
        int byteIndex2 = 0; 
        int temp = 0; 
        int mLeftTemp = 0; 
        int mRightTemp = 0; 
        int a = 0; 
        int x = 0; 

        for (int frameIndex = 0; frameIndex < readSize; frameIndex++) { 

         for (int c = 0; c < 1; c++) { 

          if (iGain != 1) { 

           long accumulator = 0; 
           for (int b = 0; b < bytesPerSample; b++) { 

            accumulator += ((long) (mBuffer[byteIndex++] & 0xFF)) << (b * 8 + emptySpace); 
           } 

           double sample = ((double) accumulator/(double) Long.MAX_VALUE); 
           sample *= iGain; 
           int intValue = (int) ((double) sample * (double) Integer.MAX_VALUE); 

           for (int i = 0; i < bytesPerSample; i++) { 
            mBuffer[i + byteIndex2] = (byte) (intValue >>> ((i + 2) * 8) & 0xff); 
           } 
           byteIndex2 += bytesPerSample; 

          } 
         }// end for(channel) 

         // mBuffer[frameIndex] *=iGain; 
         if (mBuffer[frameIndex] > 32765) { 
          mBuffer[frameIndex] = 32767; 

         } else if (mBuffer[frameIndex] < -32767) { 
          mBuffer[frameIndex] = -32767; 
         } 
         output.writeShort(mBuffer[frameIndex]); 
         sum += mBuffer[frameIndex] * mBuffer[frameIndex]; 

        } 

        if (readSize > 0) { 
         final double amplitude = sum/readSize; 
         mProgressBar.setProgress((int) Math.sqrt(amplitude)); 
        } 
       } 
      } catch (IOException e) { 
       Toast.makeText(MainActivity.this, e.getMessage(), 
         Toast.LENGTH_SHORT).show(); 
      } finally { 
       mProgressBar.setProgress(0); 
       if (output != null) { 
        try { 
         output.flush(); 
        } catch (IOException e) { 
         Toast.makeText(MainActivity.this, e.getMessage(), 
           Toast.LENGTH_SHORT).show(); 
        } finally { 
         try { 
          output.close(); 
         } catch (IOException e) { 
          Toast.makeText(MainActivity.this, e.getMessage(), 
            Toast.LENGTH_SHORT).show(); 
         } 
        } 
       } 
      } 
     } 
    }).start(); 
} 

private void rawToWave(final File rawFile, final File waveFile) 
     throws IOException { 

    byte[] rawData = new byte[(int) rawFile.length()]; 
    DataInputStream input = null; 
    try { 

     input = new DataInputStream(new FileInputStream(rawFile)); 
     input.read(rawData); 
    } finally { 
     if (input != null) { 
      input.close(); 
     } 
    } 

    DataOutputStream output = null; 
    try { 
     output = new DataOutputStream(new FileOutputStream(waveFile)); 
     // WAVE header 
     // see http://ccrma.stanford.edu/courses/422/projects/WaveFormat/ 
     writeString(output, "RIFF"); // chunk id 
     writeInt(output, 36 + rawData.length); // chunk size 
     writeString(output, "WAVE"); // format 
     writeString(output, "fmt "); // subchunk 1 id 
     writeInt(output, 16); // subchunk 1 size 
     writeShort(output, (short) 1); // audio format (1 = PCM) 
     writeShort(output, (short) 1); // number of channels 
     writeInt(output, SAMPLE_RATE); // sample rate 
     writeInt(output, SAMPLE_RATE * 2); // byte rate 
     writeShort(output, (short) 2); // block align 
     writeShort(output, (short) 16); // bits per sample 
     writeString(output, "data"); // subchunk 2 id 
     writeInt(output, rawData.length); // subchunk 2 size 
     // Audio data (conversion big endian -> little endian) 
     short[] shorts = new short[rawData.length/2]; 
     ByteBuffer.wrap(rawData).order(ByteOrder.LITTLE_ENDIAN) 
       .asShortBuffer().get(shorts); 
     ByteBuffer bytes = ByteBuffer.allocate(shorts.length * 2); 

     for (short s : shorts) { 

      // Apply Gain 
      /* 
      * s *= iGain; if(s>32767) { s=32767; } else if(s<-32768) { 
      * s=-32768; } 
      */ 
      bytes.putShort(s); 
     } 
     output.write(bytes.array()); 
    } finally { 
     if (output != null) { 
      output.close(); 
     } 
    } 
} 

private File getFile(final String suffix) { 
    Time time = new Time(); 
    time.setToNow(); 
    return new File(Environment.getExternalStorageDirectory(), 
      time.format("%Y%m%d%H%M%S") + "." + suffix); 
} 





private void writeInt(final DataOutputStream output, final int value) 
     throws IOException { 
    output.write(value >> 0); 
    output.write(value >> 8); 
    output.write(value >> 16); 
    output.write(value >> 24); 
} 

private void writeShort(final DataOutputStream output, final short value) 
     throws IOException { 
    output.write(value >> 0); 
    output.write(value >> 8); 
} 

private void writeString(final DataOutputStream output, final String value) 
     throws IOException { 
    for (int i = 0; i < value.length(); i++) { 
     output.write(value.charAt(i)); 
    } 
} 
}