Timekeeping signal source for an electronic timepiece

Details Timekeeping signal source for an electronic timepiece Timekeeping signal source for an electronic timepiece

1981-06-01

1984-01-24

Isen, F. W.

Horology: time measuring systems or devices

Regulating means

For adjusting the frequency or beat

368202, 368159, 331 47, G04G 302

Patent

active

044273029

ABSTRACT:
A timekeeping signal source for an electronic timepiece produces a highly accurate timekeeping signal which is stable in frequency with respect to both temperature variations and long-term drift. The timekeeping signal is produced by phase lock control using a high frequency reference signal from a crystal-controlled high-frequency oscillator. Phase lock control can be performed continuously or on an intermittent basis, in order to reduce power consumption. In addition, the timekeeping rate can be adjusted with a resolution within one period of the high frequency reference signal, by variation of a numeric value stored in digital memory means.

REFERENCES:
patent: 4241435 (1980-12-01), Fujita et al.
patent: 4264967 (1981-04-01), Fujita et al.

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