Timepiece having a divider chain with an adjustable division rat

Details Timepiece having a divider chain with an adjustable division rat Timepiece having a divider chain with an adjustable division rat

1981-11-24

1984-06-26

Roskoski, Bernard

Horology: time measuring systems or devices

Regulating means

For adjusting the frequency or beat

368202, G04B 1712

Patent

active

044563868

ABSTRACT:
The timepiece includes a low frequency oscillator serving as time base and rranged to feed a first chain of frequency dividers having an adjustable division rate in order to display the time and a high frequency oscillator feeding a second chain of frequency dividers. During an imprecise period established by the first chain (3) reference pulses from the second chain (7) are counted thereby to establish a binary value (HF-DF) representing the amount of imprecision of the first chain in respect of the reference. This value is transferred into a memory in order to correct directly or indirectly the division rate of the first divider chain. There is thus obtained an oscillator having the stability of a high frequency oscillator but with energy consumption only slightly exceeding that of a low frequency oscillator.

REFERENCES:
patent: 4024416 (1977-05-01), Fujita et al.
patent: 4159622 (1979-07-01), Akahane
patent: 4325036 (1982-04-01), Kuwabara
patent: 4344046 (1982-08-01), Zumsteg
patent: 4345221 (1982-08-01), Zumsteg

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