| 摘要 |
<p>PURPOSE:To synchronize the whole loop by comparing an independent timing clock with a clock extracted by a signal received by a station concerned and executing synchronization only when the timing of both the clocks are included in a fixed range in the plural stations on a loop communication line. CONSTITUTION:A clock pulse extracted from a signal received from a communication line 9 and a clock pulse for the station concerned from the communication line 8 are applied to a phase difference detecting circuit 1. The rises of both pulses are less than a fixed time difference, ''1'' is outputted to a communication line 10. Therefore an inverse signal of the rotation 9 is obtained from the output of an EXOR 4. A signal decoded by a clock extracted from the received signal is applied from a line 5 to a flip-flop 2, synchronized by the output of an EXOR 4 and then synchronized with the clock of the station by a flip-flop 3 to obtain the synchronized signal from an output line 7.</p> |
