| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent output of wrong time information from a clocking system. <P>SOLUTION: An atomic clock checking part 12 determines whether the frequency of a pulse generated from an atomic clock 2 is normal or not by using an internal clock generated from an internal timepiece 11 and a pulse generated from an atomic clock 3. A timepiece selection part 13 selects the atomic clock 3 when the atomic clock 2 is determined to be abnormal based on a determination result by the atomic clock checking part 12, and imparts the pulse generated from the atomic clock 3 to a clocking part 14. A label selection part 15 selects either of each time information imparted from GPS time servers 4, 5, and imparts the selected time information to the clocking part. The clocking part 14 counts the number of pulses imparted from the timepiece selection part 13, and takes the time information selected by the label selection part 15 when reaching a prescribed value. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
