Java: Hamming Penceresini Ses Dosyasına Uygula

Question

Hamming Pencere İşlevini bir ses dosyasına uygulamak istiyorum. Bugüne kadar Window Function

Benim Java Sınıf:

public class SpeechRecognition { 
public static void main(String[] args) throws Exception { 
    // load File 
    byte[] audioBytes = loadFile("hallo.wav"); 

    System.out.println(Arrays.toString(audioBytes)); 

    // preEmphasis 
    audioBytes = preEmphasis(audioBytes); 

    System.out.println(Arrays.toString(audioBytes)); 

    // windowing & overlap 
} 

// preEmphasis | s'N = sN - asN-1 | emph = 0.97 
public static byte[] preEmphasis(byte[] input) { 
    byte[] output = new byte[input.length]; 
    float emph = 0.97f; 

    output[0] = input[0]; 
    for (int i = 1; i < input.length; i++) { 
     output[i] = (byte) (input[i] - emph * input[i - 1]); 
    } 

    return output; 
} 

public static byte[] windowing(byte[] input) { 

} 

public static double[] calculateFFT(byte[] signal) { 
    final int mNumberOfFFTPoints = 1024; 
    double mMaxFFTSample; 

    @SuppressWarnings("unused") 
    int mPeakPos = 0; 

    double temp; 
    Complex[] y; 
    Complex[] complexSignal = new Complex[mNumberOfFFTPoints]; 
    double[] absSignal = new double[mNumberOfFFTPoints/2]; 

    for (int i = 0; i < mNumberOfFFTPoints; i++) { 
     temp = (double) ((signal[2 * i] & 0xFF) | (signal[2 * i + 1] << 8))/32768.0F; 
     complexSignal[i] = new Complex(temp, 0.0); 
    } 

    y = FFT.fft(complexSignal); // --> Here I use FFT class 

    mMaxFFTSample = 0.0; 
    mPeakPos = 0; 
    for (int i = 0; i < (mNumberOfFFTPoints/2); i++) { 
     absSignal[i] = Math.sqrt(Math.pow(y[i].re(), 2) + Math.pow(y[i].im(), 2)); 
     if (absSignal[i] > mMaxFFTSample) { 
      mMaxFFTSample = absSignal[i]; 
      mPeakPos = i; 
     } 
    } 

    return absSignal; 

} 

public static float melToFreq(float input) { 
    return (float) (700 * (Math.pow(10, input/2595) - 1)); 
} 

public static float freqToMel(float input) { 
    return (float) (2595 * Math.log10(1 + (input/700))); 
} 

// load wav File 
public static byte[] loadFile(String name) throws Exception { 
    @SuppressWarnings("unused") 
    int totalFramesRead = 0; 
    File fileIn = new File(name); 
    AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(fileIn); 
    int bytesPerFrame = audioInputStream.getFormat().getFrameSize(); 
    if (bytesPerFrame == AudioSystem.NOT_SPECIFIED) { 
     bytesPerFrame = 1; 
    } 
    int numBytes = 1024 * bytesPerFrame; 
    byte[] audioBytes = new byte[numBytes]; 
    int numBytesRead = 0; 
    int numFramesRead = 0; 
    while ((numBytesRead = audioInputStream.read(audioBytes)) != -1) { 
     numFramesRead = numBytesRead/bytesPerFrame; 
     totalFramesRead += numFramesRead; 
    } 

    return audioBytes; 
} 
} 

Ben dosyayı doğru okumak ve benim bayt dizisine şimdi işlevini uygulayabilirsiniz nasıl olmadığını bilmek istiyorum.

Answer 1

Sen aşağıdaki gibi olması yolu (hiç değilse) sadece bir kare okur çünkü byte okuma değiştirmek zorunda:

public static byte[] loadFile(String name) throws Exception { 
    @SuppressWarnings("unused") 
    int totalFramesRead = 0; 
    ByteArrayOutputStream outputStream=new ByteArrayOutputStream(); 
    File fileIn = new File(name); 
    AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(fileIn); 
    int bytesPerFrame = audioInputStream.getFormat().getFrameSize(); 
    if (bytesPerFrame == AudioSystem.NOT_SPECIFIED) { 
     bytesPerFrame = 1; 
    } 
    int numBytes = 1024 * bytesPerFrame; 
    byte[] audioBytes = new byte[numBytes]; 
    int numBytesRead = 0; 
    int numFramesRead = 0; 
    while ((numBytesRead = audioInputStream.read(audioBytes, 0, audioBytes.length)) != -1) { 
     outputSteam.wite(audioBytes, 0, numBytesRead); 
    } 
    byte[] bytesOut=outputStream.toByteArray();  
    return bytesOut; 
}