| 摘要 |
To implement an accurate synchronization by detecting a signal for time notice from an external reference clock without delay and acquiring the time of a system clock of comparison object at the present time without delay. A computer system comprises a time information inputting part 12 for detecting a signal for time notice sent from an external reference clock and acquiring an internal time at the present time from the system clock 20 inside the computer system, and a time correction controlling part 13 for comparing the time information together with the signal for time notice from the reference clock 40 and the internal time at the time of detecting the signal for time notice and correcting the time of the system clock 20 based on the comparison result. And the time correction controlling part 13 calculates a signal interval based on the internal time acquired from the time information inputting part 12. evaluating if the calculated signal interval falls within a certain confidence interval obtained by a statistical processing of sampling the signal for time notice over the past signal intervals, and judging whether or not it is required to correct the internal time.
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