Automatically correcting electronic timepiece for selected signa

Details Automatically correcting electronic timepiece for selected signa Automatically correcting electronic timepiece for selected signa

1994-03-28

1995-06-06

Roskoski, Bernard

Horology: time measuring systems or devices

Plural timepiece system or system device

With wireless synchronization

368 55, G04C 1102

Patent

active

054228638

ABSTRACT:
An electronic timepiece which corrects time automatically in response to external time information signals. The timepiece includes a first timekeeping circuit for keeping a standard time and a receiver for selectively receiving external signals. A checking circuit checks the external signal to determine whether it contains a time information signal and which provides a current time signal in response to receipt of a time information signal. A second timekeeping circuit receives and stores the current time signal and a setting circuit sets the second timekeeping circuit to the current time in accordance with the current time signal. A correction circuit provides a correction signal and corrects the first timekeeping circuit to the current time in accordance with the correction signal and the current time signal. The correction is applied periodically at a rate which is a function of the error and the time between sucessive reciepts of the time information signal.

REFERENCES:
patent: 4204398 (1980-05-01), Lemelson
patent: 4440501 (1984-04-01), Schulz
patent: 4525685 (1985-06-01), Hesslberth
patent: 4569598 (1986-02-01), Jacobs
patent: 4582434 (1986-04-01), Planngger et al.
patent: 4650344 (1987-03-01), Allgaier et al.
patent: 4823328 (1989-04-01), Conklin et al.

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