Time correction of an electronic clock
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United States of America Patent
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May 5, 1998
Issued Date -
N/A
app pub date -
Jan 22, 1997
filing date -
May 20, 1994
priority date (Note) -
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Abstract
An electronic clock includes a usual oscillator and a more accurate oscillator. The usual oscillator generates a first frequency which causes the electronic clock to operate and the more accurate oscillator generates a second frequency which is used as a reference frequency. Referring to the second frequency, the first frequency is measured by a frequency measurement circuit and a deviation of the first frequency from a design frequency is calculated by a processor. According to the deviation, time correction of the electronic clock is performed. Therefore, even if an actual oscillation frequency of the usual oscillator is not stable precisely, the accurate time correction can be achieved.
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