| 摘要 |
PURPOSE:To confirm the state of the phase of a slave device from a master device by producing a reproducing reference phase signal by means of a reference signal supplied from the master device and executing phase synchronizing operations in opposite directions by means of the 2nd forward transmission line and 2nd backward transmission line by using the reproducing reference phase signal. CONSTITUTION:When no secular change occurs in the transmission delaying quantity of a forward transmission line 3, a master device 1 and slave device 2 can be maintained in a synchronized state. However, it is necessary to find the transmission delaying quantity of the line 3 at every fixed time and adjust the phase of a reference phase signal, since a secular change actually occurs. Therefore, at the slave device 2 the line 3 is connected with a backward transmission line 4 by means of a turning back switch 22 and the reference phase signal from a reference phase generator 11 is turned back to the master device 1. At the master device 1, the total transmission delaying quantity Tt of the lines 3 and 4 is measured by means of a transmission delay measuring instrument 13. Therefore, the transmission delaying quantity of the forward transmission line 3 can be found by calculation from a previously measured and stored initial transmission delaying difference taud and initial total transmission delaying quantity taut. |
