Digital frequency trimmed electronic timepiece

Details Digital frequency trimmed electronic timepiece Digital frequency trimmed electronic timepiece

1979-12-21

1981-09-15

Miska, Vit W.

Horology: time measuring systems or devices

Regulating means

For adjusting the frequency or beat

368 47, G04B 1712, G04C 1102

Patent

active

042901308

ABSTRACT:
A method and apparatus for adjusting the frequency of a piezoelectric crystal oscillator. The effective frequency of the oscillator is adjusted (trimmed) by periodically inhibiting pulses to the divider stage.
The pulse inhibit circuit includes a nonvolatile programmable read-only-memory (ROM) to store binary complement information corresponding to the number of oscillator pulses to be suppressed.
A counter is periodically preset with the binary complement information and the count advances in response to oscillator pulses. The difference count between the complement number and the counter's maximum count controls the number of pulses periodically suppressed.

REFERENCES:
patent: 3722258 (1973-03-01), Besson et al.
patent: 3895486 (1975-07-01), Hammer et al.
patent: 3914931 (1975-10-01), Tsuruishi
patent: 4024416 (1977-05-01), Fujita et al.
patent: 4044547 (1977-08-01), Kusumoto
patent: 4051663 (1977-10-01), Chihara et al.
patent: 4147022 (1979-04-01), Icmkawa
patent: 4155218 (1979-05-01), Wiget
patent: 4199726 (1980-04-01), Bukosky et al.
Basic Digital Electronics, Ray Rtan, Tab Books, 1975.

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