Clock device and computer-readable record medium storing program for implementing the same
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United States of America Patent
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Apr 23, 2013
Grant Date -
Apr 1, 2010
app pub date -
Sep 21, 2009
filing date -
Sep 30, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A clock device acquires time information representing present time from an external device at preset time intervals, corrects time of an internal clock based on the time information, calculates an error of the time of the internal clock based on the present time represented by the time information, and changes a first set value of the time interval based on the error. The changing updates the first set value to a second set value, which is m times the first set value when the error is smaller than a first threshold value, while updating the first set value to a second set value, which is n times the set value when the error is larger than a second threshold value larger than the first threshold value (m, n: positive values satisfying m>1, n<1 and m·n≠1).
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