Electronic timepiece

Details Electronic timepiece Electronic timepiece

1974-12-05

1977-10-04

Weldon, Ulysses

58 23R, 58 855, 58 35W, G04C 1308

Patent

active

040516636

ABSTRACT:
An electronic timepiece wherein the period of the timekeeping signal produced by the divider circuit is adjusted in response to an externally applied reference signal is provided. The electronic timepiece includes an oscillator circuit for producing a high frequency time standard signal, a divider circuit including a plurality of series-connected divider stages adapted to produce a low frequency timekeeping signal in response to the time standard signal, and a display for displaying time in response to the timekeeping signal. A receiving circuit receives an externally applied reference signal corresponding to actual time, and a comparator circuit compares the high frequency time standard signal against the reference signal and in response thereto produces a frequency difference signal. A memory circuit is adapted to store the frequency difference signal. A division ratio regulation circuit in response to the frequency difference signal stored in the memory circuit regulates the division ratio of the divider circuit to thereby produce a timekeeping signal representative of actual time.

REFERENCES:
patent: 2786972 (1957-03-01), Dreier et al.
patent: 3530663 (1970-09-01), Marti
patent: 3541779 (1970-11-01), Langley
patent: 3777471 (1973-12-01), Koehler et al.
patent: 3812670 (1974-05-01), Nikaido et al.
patent: 3852953 (1974-12-01), Mischiatti
patent: 3895486 (1975-07-01), Hammer et al.
patent: 3914931 (1975-10-01), Tsuruishi
patent: 3916612 (1975-11-01), Morokawa et al.
patent: 3948036 (1976-04-01), Morokawa
A. Barna, et al., "Integrated Circuits in Digital Electronics," pp. 158-161, John Wiley & Sons, New York, 1973.

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