iirtable.h

音频数据采集与IIR处理例程

//bandpass coeffection for 10 order;midle frequence is 2k,band width is 1k
#define bandnum 10
#define stages 2             	//number of 2nd-order stages
float dlyl_0[2] = {0}; 
float dlyl_1[2] = {0};
float dlyr_0[2] = {0};
float dlyr_1[2] = {0};

#pragma DATA_SECTION (b0,"b0tab")
float b0[3]= {    	//numerator coefficients  
               0.1159,  -0.0802,   0.1159     
             };
             
#pragma DATA_SECTION (b1,"b1tab")             
float b1[3]= {1.0000,  -2.0000,   1.0000};    

#pragma DATA_SECTION (a0,"a0tab")
float a0[2]=       
  {  //*denominator coefficients  
       -1.4845,   0.6626};   
       
#pragma DATA_SECTION (a1,"a1tab")       
float a1[2]=  
  {    -1.9830,   0.9833};	
void init_IIR(void)
{
   Uint16 t;
  for(t=0;t<2;t++)
  {
        dlyl_0[t]=0;
        dlyl_1[t]=0;
        dlyr_0[t]=0;
        dlyr_1[t]=0;
    }
 }