Time correction of an electronic clock

Details Time correction of an electronic clock Time correction of an electronic clock

H - Electricity

04

L

H04L 7/00 (2006.01) G04G 3/02 (2006.01) G04G 7/00 (2006.01)

Patent

CA 2149813

An electronic clock comprises 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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