| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a data recovery method to extrapolate clock correction in the asymmetrical communication system for data transmission by deciding clock correction when data are received for an interval and extrapolating the corrected result to a next interval. SOLUTION: A central station 1 and pluralities of slave stations 3 are connected by a communication medium, data are communicated between the central station 1 and the slave stations 3 and data are not transmitted among the slave stations. A signal outputted from the central station 1 is split by a communication splitter/combiner 2 and given to the slave stations 3, and signals from pluralities of the slave stations 3 are combined by the splitter/combiner 2 and given to the central station 1. The clock signal of the central station 1 is more accurate than that of the slave stations 3. A clock adjustment conducted among part of the slave stations 3 for a 1st interval is extrapolated at a 2nd interval, that is, each interval between signal transmission of a central office. The clock signal is fixed in the central station 1 and a phase of received data from a slave station 3 at a given time interval is extrapolated to a succeeding packet of the slave station 3 at a 2nd time interval from data of a 1st packet from the slave station 3.</p> |
