| 摘要 |
PURPOSE: To detect pseudo-synchronization of reference signals from a local reception oscillator to digital multi-level phase deviation quadrature modulation signals by reproducing clock signal strings from base-band signals and monitoring a phase deviation between the clock signal strings. CONSTITUTION: A pseudo-synchronization detection system 8 is provided with a D-type FF 12 and a monostable circuit 13 capable of re-triggering. The input of the monostable circuit 13 is connected to the output of the FF 12, and the FF 12 receives the clock signals HP of a channel P at the input D and receives the clock signals HQ of the channel Q at the clock input M. In this case, the clocks HP are continuously at a level 0 or 1 in the rising section of the clocks HQ. Thus, the output S of the FF 12 continues to be at the level 0 or 1. Thus, the monostable circuit 13 is maintained at a fixed level 1 by a continuous rising section for connecting the pseudo-synchronization, that is receiving it at the input. |
