loop_intr.c

DSP6000＋AD535语音采集的单频噪声消除的C语音代码

//Loop_intr.c

//short bufferlength=512;
short buffer[512];
//short i=0;

#include "c6x11dsk.h"
#include "c6x.h"
#include"ft900.cof"
#include"ft2700.cof"
int i=0;
int j=0;
short dly[stages][2]={0};
short dly2[stages][2]={0};
interrupt void c_int11()         //interrupt service routine
{
   int i,j, input;
 int un, yn,un2,yn2;

 input = mcbsp0_read();	
 for (i = 0; i < stages; i++)  
  {
   un=input-((b1[i][0]*dly[i][0])>>15) - ((b1[i][1]*dly[i][1])>>15);

   yn=((a1[i][0]*un)>>15)+((a1[i][1]*dly[i][0])>>15)+((a1[i][2]*dly[i][1])>>15);

   dly[i][1] = dly[i][0]; 	 
   dly[i][0] = un;            
   input = yn;
     			 
  }
  //buffer[j]=yn;
  //j++;
  //if(j>=512) j=0;
  
    //mcbsp0_write(yn); 
    for (i = 0; i < stages; i++)  
  {
   un2=yn-((b2[i][0]*dly2[i][0])>>15) - ((b2[i][1]*dly2[i][1])>>15);

   yn2=((a2[i][0]*un2)>>15)+((a2[i][1]*dly2[i][0])>>15)+((a2[i][2]*dly2[i][1])>>15);

   dly2[i][1] = dly2[i][0]; 	 
   dly2[i][0] = un2;            
   yn = yn2;
     			 
  }
    output_sample(yn2);      
   return;	
}

void main()
{
  comm_intr();                   //init DSK, codec, McBSP
  while(1);                	   //infinite loop
}