Electronic wristwatch

Details Electronic wristwatch Electronic wristwatch

1981-02-19

1983-09-27

Truhe, J. V.

Horology: time measuring systems or devices

Regulating means

For adjusting the frequency or beat

368186, G04B 1712

Patent

active

044070195

ABSTRACT:
An electronic wristwatch wherein a timing rate adjustment signal, representative of the amount of timing rate adjustment being effected and/or needed to be effected, is depicted. The electronic wristwatch includes a divider circuit for receiving a high frequency time standard signal from a quartz crystal oscillator circuit and for producing a low frequency timekeeping signal in response thereto. An adjustment circuit is coupled to the divider circuit for adjusting the frequency of the timekeeping signal by a predetermined amount. A converter circuit is adapted to be selectively coupled to the divider circuit to receive the adjusted low frequency timekeeping signal and, in response thereto, to produce a timing rate adjustment signal representative of the amount of adjustment applied in the low frequency timekeeping signal, and to produce a signal representative of the unadjusted oscillator frequency.

REFERENCES:
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patent: 3895486 (1975-07-01), Hammer et al.
patent: 3916612 (1975-11-01), Morokawa et al.
patent: 4051663 (1977-10-01), Chihara et al.
patent: 4075827 (1978-02-01), Yoshida et al.
patent: 4085577 (1978-04-01), Natori
patent: 4148184 (1979-04-01), Akahane et al.
patent: 4155218 (1979-05-01), Wiget
patent: 4254494 (1981-03-01), Maeda
patent: 4290130 (1981-09-01), Lowdenslager et al.
patent: 4292680 (1981-09-01), Morokawa et al.

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