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filter.c 1.4 KiB

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. #include <filter.h>
  23. float fir( float *buff, float *coeff, int len)
  24. {
  25. int i;
  26. double r;
  27. r=0.0;
  28. for(i=0;i<len;i++) {
  29. r+=buff[i]*coeff[i];
  30. }
  31. return r;
  32. }
  33. void iqfir( float *buff, float *Icoeff, float *Qcoeff, int len, float *I,float *Q)
  34. {
  35. int i;
  36. *I=*Q=0.0;
  37. for(i=0;i<len;i++) {
  38. register double v=buff[i];
  39. *I+=v*Icoeff[i];
  40. *Q+=v*Qcoeff[i];
  41. }
  42. }
  43. float rsfir(float *buff,float *coeff,int len ,double offset ,double delta)
  44. {
  45. int i;
  46. double n;
  47. double out;
  48. out=0.0;
  49. for(i=0,n=offset;n<len;n+=delta,i++)
  50. out+=buff[i]*coeff[(int)n];
  51. return out;
  52. }