| 摘要 |
<p>The present invention provides strict commercial time synchronization. Transmission information data and N bits data in a PN signal generated from a PN generator are transmitted to a downstream station by multiplexing circuit. Then, the transmission information data and N bits data are demultiplexed by a demultiplexing circuit into the transmission information data data and the PN signal. An error between this PN signal and a PN signal generated by a PN generator is detected by a timing detection circuit. The operation timing of the PN generator is corrected corresponding to this error. The corrected PN signal and the transmission information data are transmitted by a multiplexing circuit to a upstream station. Then, the corrected PN signal and the transmission information data are demultiplexed by a demultiplexing circuit. Subsequently, the timing of generation of the PN-signal by the PN generator is shifted ahead by half the time corresponding to the error detected by a timing detection circuit from this PN signal and the PN signal generated by the PN generator. <IMAGE></p> |
