| 摘要 |
PURPOSE:To shorten the synchronous leading-in time and suppress the phase jitter for normal synchronization, by switching constants of the integrating circuit according to the operation state. CONSTITUTION:The receiving signal inputted to input terminal 10 is compared with the reproducing timing signal, and a pulse is output to terminal 33a or 33b according to advance or delay of the phase and is supplied to loop filter 30. If the burst signal is detected from the receiving signal, only counter 31 acts as the loop filter until the number of output pulses of the reproducing timing reaches a prescribed value, and counters 31 and 32 act as the loop filter when the number of output pulses reaches a prescribed value or more. Consequently, the number of stage for cascade connection of loop filter 30 is reduced at the instant when the burst signal is inputted, thus performing rapid control. |
