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filter.h 1.3 KiB

21 years ago
21 years ago
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  1. /*
  2. * Atpdec
  3. * Copyright (c) 2003 by Thierry Leconte (F4DWV)
  4. *
  5. * $Id$
  6. *
  7. * This library is free software; you can redistribute it and/or modify
  8. * it under the terms of the GNU Library General Public License as
  9. * published by the Free Software Foundation; either version 2 of
  10. * the License, or (at your option) any later version.
  11. *
  12. * This program is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15. * GNU Library General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU Library General Public
  18. * License along with this library; if not, write to the Free Software
  19. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20. *
  21. */
  22. typedef struct {
  23. float G;
  24. float x[3];
  25. float y[2];
  26. } iircoeff_t;
  27. typedef struct {
  28. float x[5];
  29. float y[3];
  30. } iirbuff_t;
  31. float rsfir(float *buff,const float *coeff,const int len ,const double offset ,const double delta);
  32. void iqfir(float *buff,const float *Icoeff,const float *Qcoeff, const int len ,float *I, float *Q);
  33. float fir(float *buff,const float *coeff,const int len);
  34. double iir(double x,iirbuff_t *buff, const iircoeff_t *coeff);