Android Open Source - APSK Real F I R Filter

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Back to project page APSK.

License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * This file is part of znudigi./*  w  w w  .j  av  a  2  s  . c  om*/
 * Released under GNU GENERAL PUBLIC LICENSE Version 2
 * See file COPYING.
 * Copyright (C) 2007-2008 Leigh L. Klotz, Jr. <Leigh@WA5ZNU.org>
 */

package org.wa5znu.znuradio.dsp;

public class RealFIRFilter extends BaseFIRFilter {

  double x[];
  int counter = 0;

  public RealFIRFilter(int decimation) {
    super(decimation);
  }

  public void implement(FilterDesign design) {
    super.implement(design);
    if (x == null || x.length != taps) {
      x = new double[taps];
      for(int k = 0; k < taps; k++) {
  x[k] = 0.0;
      }
    }
  }

  public double[] filter(double io[], int nSamples) {
    int j = 0;
    int taps = a.length;
    for (int i = 0; i < nSamples; i++) {
      x[0] = io[i];
      if (++counter == decimation) {
  counter = 0;
  double y = 0.0;
  for (int k = 0; k < taps; k++) {
    y += x[k] * a[k];
  }
  io[j++] = y;
      }
      for(int k = taps - 1; k > 0; k--) {
  x[k] = x[k - 1];
      }
    }
    return io;
  }

}

Java Source Code List