Examples of com.talixa.specan.fft.Complex

com.talixa.specan.fft.Complex
Compilation: javac Complex.java Execution: java Complex Data type for complex numbers. The data type is "immutable" so once you create and initialize a Complex object, you cannot change it. The "final" keyword when declaring re and im enforces this rule, making it a compile-time error to change the .re or .im fields after they've been initialized. % java Complex a = 5.0 + 6.0i b = -3.0 + 4.0i Re(a) = 5.0 Im(a) = 6.0 b + a = 2.0 + 10.0i a - b = 8.0 + 2.0i a * b = -39.0 + 2.0i b * a = -39.0 + 2.0i a / b = 0.36 - 1.52i (a / b) * b = 5.0 + 6.0i conj(a) = 5.0 - 6.0i |a| = 7.810249675906654 tan(a) = -6.685231390246571E-6 + 1.0000103108981198i

      // fill the data array
      for (int offset = 0; offset < FFT_LEN; offset++) {
        int desiredSampleIndex = (baseAddress)+offset;          
        short signedSample = data[desiredSampleIndex];                  
        double sample = ((double) signedSample) / (Short.MAX_VALUE);
        amplitudeData[offset] = new Complex(sample,0);
      }                              


      // run fft
      frequencyData = FFT.fft(amplitudeData);
                  
      if (shift < 0) {
        // downshift
        
        // calculate new 0
        int newZero = SharedDSPFunctions.getSampleNumberByFrequency(FFT_LEN, shift*-1);
        
        // shift new zero to zero
        for(int i = 0; i < FFT_LEN/2; ++i) {
          Complex value;
          if (i + newZero < FFT_LEN/2) {
            value = frequencyData[i+newZero];
          } else {
            value = new Complex(0,0);
          }
        
          frequencyData[i] = value;
          frequencyData[FFT_LEN-i-1] = value;
        }  
      } else {
        // calculate where to put the old 0
        int oldZero = SharedDSPFunctions.getSampleNumberByFrequency(FFT_LEN, shift);
        
        // upshift
        for(int i = FFT_LEN/2-1; i > 0 ; --i) {
          Complex value;
          if (i - oldZero > 0) {
            value = frequencyData[i-oldZero];
          } else {
            value = new Complex(0,0);
          }
        
          frequencyData[i] = value;
          frequencyData[FFT_LEN-i-1] = value;
        }

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    int numberSamples = samples.length;
    for(int baseAddress = 0; (baseAddress)+FFT_LEN <= numberSamples; baseAddress+=shiftValue) {      
      for (int offset = 0; offset < FFT_LEN; offset++) {        
        short signedSample = samples[baseAddress+offset];                
        double sample = ((double) signedSample) / Short.MAX_VALUE;
        amplitudeData[offset] = new Complex(sample,0);
      }
                        
      while (!playing) {          
        Thread.sleep(100);          
      }

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      // fill the data array
      for (int offset = 0; offset < FFT_LEN; offset++) {
        int desiredSampleIndex = (baseAddress)+offset;          
        short signedSample = data[desiredSampleIndex];                  
        double sample = ((double) signedSample) / (Short.MAX_VALUE);
        amplitudeData[offset] = new Complex(sample,0);
      }                              


      // run fft
      frequencyData = FFT.fft(amplitudeData);
      
      // remove below low freq
      int removeBelow = SharedDSPFunctions.getSampleNumberByFrequency(FFT_LEN, filterBelowFreq);
      for(int i = 0; i < removeBelow; ++i) {
        frequencyData[i] = new Complex(0,0);
        frequencyData[FFT_LEN-i-1] = new Complex(0,0);
      }
      
      // remove above high freq      
      int removeAbove = SharedDSPFunctions.getSampleNumberByFrequency(FFT_LEN, filterAboveFreq);
      for(int i = removeAbove; i < frequencyData.length/2; ++i) {
        frequencyData[i] = new Complex(0,0);
        frequencyData[FFT_LEN-i-1] = new Complex(0,0);
      }                  
      
      // undo fft
      Complex[] filterFft = FFT.ifft(frequencyData);

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      // fill the data array
      for (int offset = 0; offset < FFT_LEN; offset++) {
        int desiredSampleIndex = (baseAddress)+offset;          
        short signedSample = data[desiredSampleIndex];                  
        double sample = ((double) signedSample) / (Short.MAX_VALUE);
        amplitudeData[offset] = new Complex(sample,0);
      }                              


      // run fft
      frequencyData = FFT.fft(amplitudeData);

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com.talixa.specan.dsp.BandPassFilter

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