| 摘要 |
PURPOSE:To improve a jitter characteristic, to expand a carrier synchronization lock range and to reduce a lock time in a multi-value orthogonal amplitude demodulator provided with a digitized carrier synchronization circuit and a transversal equalizer. CONSTITUTION:When an error rate characteristic is deteriorated by a specified value or over, phase information detected at a prescribed signal point and phase information detected from all signal points are fed back to a VCO 22 alternately by using an output signal from a pulse generating circuit 20 at a carrier synchronization circuit. Moreover, transversal equalizers 15, 16 repeat the normal control and the reset state alternately by using a signal of a same pulse generating circuit. |
