Error correction method and apparatus for electronic timepieces

Details Error correction method and apparatus for electronic timepieces Error correction method and apparatus for electronic timepieces

1981-02-13

1983-10-04

Roskoski, Bernard

Horology: time measuring systems or devices

Regulating means

For adjusting the frequency or beat

368200, 368184, G04B 1712

Patent

active

044075898

ABSTRACT:
A method and apparatus for correcting errors in an electronic digital timepiece that includes an oscillator which has a 2.sup.n frequency output, an n-stage frequency divider for reducing the oscillator output frequency to a time keeping frequency, and means for displaying the count of the time keeping frequency. The error E in the time of the timepiece for an arbitrary period of time T is determined. A computer computes a new adjustment value N+(2.sup.n-m +N)E/T where N is the preceding adjustment value and m is a nonnegative integer less than n. Then the 2.sup.n-m divisor of the first n-m stages of the n-stage frequency divider is adjusted in an amount equal to the new adjustment value. In first and second embodiments of the invention the timepiece is synchronized with a time standard at the beginning of the period of time T. In the first embodiment of the invention the timepiece user observes E (the difference between the time standard and the timepiece time at the end of the period T) and then operates a selected switch to correct the time of the timepiece and to obtain a count for E. In the second embodiment of the invention, the user operates a switch at the beginning of T and at the end of T and a count for E is obtained electronically.

REFERENCES:
patent: 3914931 (1975-10-01), Tsuruishi
patent: 3978649 (1976-09-01), Naito
patent: 4051663 (1977-10-01), Chihara et al.
patent: 4101838 (1978-07-01), Aihara et al.
patent: 4114363 (1978-09-01), Imamura
patent: 4154053 (1979-05-01), Chetelat et al.
patent: 4159622 (1979-07-01), Akahane

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