| 摘要 |
PROBLEM TO BE SOLVED: To improve the reliability of data transmission by directly obtaining stable receiving timing from received burst waves at a master station and compensating the delay time fluctuation of time division multiplex communication data which are transmitted one round between the master station and a slave station. SOLUTION: A master station A compares a clock signal extracted with a clock signal extractor 20 with a reference clock signal by means of a phase comparator 21 and transmits the phase difference data from the comparator 21 and receiving electric field detection presence/absence data and frame synchronization pattern detection presence/absence data detected by means of an electric field detector 102 and a pattern detecting circuit 103 from signals transmitted from a slave station B to the station B by multiplexing the data upon another. When the presence/absence data are not obtained from the station A through a slave-station reception antenna 10, a receiving/demodulating section 11, and a multiplexing/demultiplexing circuit 13, the station B variably controls delay time by stopping the variation of the delay time through a delay time control circuit 107 and a delay time varying circuit 17 and, at the same time, holding the delay time before stoppage. The station B, in addition, changes the phase of its transmitting data based on the phase difference data when adjusted data are obtained. |
