| 摘要 |
PURPOSE:To shorten a synchronism acquisition time by entering a semisynchronous state wherein data are received once synchronism detection is successful in an unlock state. CONSTITUTION:A signal which is received by an antenna 20 through mobile ratio is inputted to a reception part 21 and the received signal is demodulated and demodulated in synchronism with a radio signal. Then a timer 22d increases its clocked value at intervals of a reference clock and a 2nd timer sets the clocking of the 1st timer to 1 in a specific period. Namely, synchronous detection is repeatedly performed and once the synchronous detection (a) is successful, the semisynchronous state is entered to reset (b) the clocking of the 1st timer. At this time, the clocking flag of the 2nd timer is temporarily reset, so a synchronous detecting process is skipped. Further, a data receiving process is performed and synchronous detection (c) is performed; when the detection is successful, state transition is made. Consequently, the acquisition time is shortened by the transition from the unlock state to the semisynchronous state. |
