| 摘要 |
PURPOSE: To avoid occurrence of deviated time after time matching at once by changing an operating clock period of a slave clock so as to synchronize the clock with the operating clock of a master clock. CONSTITUTION: A slave station B is provided with operating clock synchronization means 8 to 11 changing an operating clock period of a slave clock 7 so as to synchronize the clock with an operating clock of a master clock 1. That is, a time deviation detection section 8 detects a time difference between a time synchronization pulse (master clock time synchronization pulse) from the master station A and a time synchronization pulse (slave clock time synchronization pulse) from the slave clock 7 and a lag or lead of the slave clock 7 with respect to the master clock 1. Furthermore, a crystal oscillator 9 outputting a pulse of a prescribed period provides an operating clock to the slave clock 7. Furthermore, a counter 10 counts up or counts down the initial value in response to the detected time difference an the lag/lead of the slave clock 7. Moreover, a preset counter 11 outputs a pulse to the slave clock 7 when the count is zero. Thus, the operating clock period of the slave clock 7 is changed to synchronize the clock with the operating clock of the master clock 1. |
