Time correction of an electronic clock

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

1997-01-22

1998-05-05

Roskoski, Bernard

Horology: time measuring systems or devices

Regulating means

For compensation

368 10, G04G 302

Patent

active

057485704

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.

REFERENCES:
patent: 4024416 (1977-05-01), Fujita et al.
patent: 4305041 (1981-12-01), Frerking
patent: 4321521 (1982-03-01), Ueda et al.
patent: 5195063 (1993-03-01), Moriya

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