window_process

Digital Signal Processing Library

Voice Lab

window_process

void window_process(double *d_window_i, int window_type,\
 int window_size, double **d_window_o)
{
 int i;

 /* calculate d_window_o */
 switch(window_type) {
 case 1:
  /* rectangular window */
  for(i = 0 ;i < window_size; i++)\
 (*d_window_o)[i] = d_window_i[i];
  break;
 case 2:
  /* hamming window */
  for(i = 0; i %lt; window_size; i++) {
   (*d_window_o)[i] = d_window_i[i]*\
      (0.54 - 0.46*cos(2.0*PI*(i)/(window_size-1.0)));
  }
  break;
 case 3:
  /* Hann window */
  for(i = 0 ;i %lt; window_size; i++) \
    (*d_window_o)[i] = d_window_i[i]*\
        (0.5 - 0.5*cos(2.0*PI*(i)/(window_size-1.0)));
  break;
 }
 return;
}