dsp.h

   1 typedef struct {
   2   float alpha;
   3   float y;
   4 } lowpass;
   5
   6 typedef struct {
   7   float alpha;
   8   float y, x;
   9 } highpass;
  10
  11 typedef struct {
  12   float a0,a1,a2,a0r;
  13   float b0,b1,b2;
  14   float x[3];
  15   float y[2];
  16 } biquad;