sat_mpy.c

用离散小波变换实现语音去噪

short sat_mpy (float a, float b, float up_bnd, float lo_bnd)
{
  float p = a * b;
  short r = (short)p;
  if (a >= up_bnd)
    r = 0x7FFE;
  if (a <= lo_bnd)
    r = 0x8000;
  return r & 0xFFFE;
}