Function sinLookup

Transceiver52M/sigProcLib.cpp:221–232

compute sine via lookup table */

/** compute sine via lookup table */
float sinLookup(const float x) 
{
  float arg = x*M_1_2PI_F;
  while (arg > 1.0F) arg -= 1.0F;
  while (arg < 0.0F) arg += 1.0F;

  const float argT = arg*((float)TABLESIZE);
  const int argI = (int)argT;
  const float delta = argT-argI;
  const float iDelta = 1.0F-delta;
  return iDelta*sinTable[argI] + delta*sinTable[argI+1];
}


/** compute e^(-jx) via lookup table. */