| 摘要 |
<p>Quadrature signals are produced from received FSK. The quadrature signals are differentiated (550, 552) and combined (570), producing a phase signal having a phase signal velocity. A phase analysis circuit (570) analyzes the phase signal and produces a zero velocity signal that signifies when the velocity of the phase signal substantially equals zero. A velocity analysis circuit (572, 574) analyzes the zero velocity signal and produces FSK information.</p> |
