fir.cpp

使用DSP和MATLAB设计的一个低通FIR滤波器

#include"stdio.h"
#include"math.h"
#include <stdlib.h>

#define PI 3.14159265

main()
{
int i;
float f[256];
FILE *fp;
if((fp=fopen("c:\\firinput2.txt","wt"))==NULL)
  {
   printf("can't open file!\n");
   exit(0);
  }
for(i=0;i<=255;i++)
  {f[i]=cos(2*PI*i*1000/8000)+cos(2*PI*i*2500/8000)/2;
   fprintf(fp,"      .word           %ld\n",(long)(f[i]*16384));
  }
fclose(fp);
}