Reference signal frequency correction in an electronic timepiece

Details Reference signal frequency correction in an electronic timepiece Reference signal frequency correction in an electronic timepiece

1975-12-17

1978-01-17

Jackmon, E. S.

Oscillators

Relaxation oscillators

328 48, 331177R, G04C 2300, H03K 2132, H03B 304

Patent

active

040684636

ABSTRACT:
Zero adjustment of second information in an electronic timepiece is carried out upon receiving a command from the operator through a zero adjust switch. Increment one is performed on minute information when the second information is above a predetermined value, for example, twenty-four seconds when the zero adjustment command is generated. The reference signal frequency is automatically corrected by detecting the second information when the zero adjustment command is generated, in such a manner that the reference signal frequency is increased to render the timepiece faster when the second information is above the predetermined value, and the reference signal frequency is decreased to render the timepiece slower when the second information is below the predetermined value when the zero adjustment command is generated. A duration counter is preferably provided for detecting a time period initiating upon generation of a zero adjustment command and terminating upon generation of the following zero adjustment command. The correction of the reference signal frequency is not carried out when the duration detected by said counter is greater than a predetermined value, for example, one month in order to inhibit the frequency correction when it is not desirable.

REFERENCES:
patent: 3530663 (1970-09-01), Marti
patent: 3540207 (1970-11-01), Keeler
patent: 3672155 (1972-06-01), Bergey et al.

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