void fir_mem2(float *x, float *num, float *y, int N, int ord, float *mem)
void fir_mem2(float *x, spx_coef_t *num, float *y, int N, int ord, spx_mem_t *mem)
void fir_mem2(float *x, float *num, float *y, int N, int ord, float *mem){   int i,j;   float xi;   for (i=0;i<N;i++)   {      xi=x[i];      y[i] = num[0]*xi + mem[0];      for (j=0;j<ord-1;j++)      {         mem[j] = mem[j+1] + num[j+1]*xi;      }      mem[ord-1] = num[ord]*xi;   }}