FSK信号鉴频的程序

只看该作者 · 2016-6-29 21:34

/*******************************************************************/
/*******************************************************************/
/* This program implements the function of finding out the largest */
/* and the second largest values of the sequence of "in_buffer[10]"*/
/*******************************************************************/
/*******************************************************************/

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

//extern float cosf(float x);
extern int in_buffer[10]={0,0,0,0,0,0,0,0,0,0}; /* in_buffer[]中的值为频谱点 */
//int out_buffer[2];

static void dataIN(void);

void main()
{
      int             i=0;
//       float       data_max=0;
      int             data_max=0;
//       float       data_max2=0;
      int    data_max2=0;

      int       i_max=0;
      int       i_max2=0;

      float       f_max=0;
      float       f_max2=0;

      int             p=0;
      int             q=0;

//       float a=0, b=3.14159;
//       a=a+0;
//       b=b+0;
//       a=cosf(b);

      /**********************************************************/
      /** 几句废话,消除warning:data_max was set but never used **/
      data_max=data_max+0;
      data_max2=data_max2+0;
//       i_max=i_max+0;
//       i_max2=i_max2+0;
      f_max=f_max+0;
      f_max2=f_max2+0;
      /**********************************************************/

      dataIN();       /* read data into memory */


/************************************************/
/** find out the greatest value of "in_buffer" **/

      for(i=0;i<=POINT_ALL-2;i++)
            {
               if (in_buffer[i+1]>in_buffer[i])
                        {data_max=in_buffer[i+1]; i_max=i+1;}

               else {data_max=in_buffer[i]; i_max=i;}
            }

      f_max=FS*i_max/POINT_ALL; /* calculate the value of carrier frequency */

/************************************************/


/*****************************************************/
/* find out the second greatest value of "in_buffer" */

            in_buffer[i_max]=0;       /* set 0 to "in_buffer[i_max]"*/

            for(p=1;p<=POINT_ALL/2;p++)
                     {
                     for(q=0;q<=POINT_ALL/2-2;q++)
                              {
                                 if (in_buffer[q+1]>in_buffer[q])
                                                {data_max2=in_buffer[q+1]; i_max2=q+1;}

                                 else       {data_max2=in_buffer[q]; i_max2=q;}
                              }

                     /* determines the availability of i_max2 through
                        estimating the distance of i_max between i_max2 */
                     if (abs(i_max-i_max2)<=GAP)       in_buffer[i_max2]=0;
                     else       break;
                     }

            f_max2=FS*i_max2/POINT_ALL;       /* calculate the value of carrier frequency2 */

/*****************************************************/

      while(1);
}

static void dataIN()
{
      /* do read data from host file */
      return;
}
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FSK信号鉴频的程序

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