FSK信号鉴频的程序
- /*******************************************************************/
- /*******************************************************************/
- /* 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)
- {data_max=in_buffer[i+1]; i_max=i+1;}
-
- else {data_max=in_buffer; 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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