Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-06-30
1979-07-03
Witkowski, Stanley J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
58 23R, 324 82, 324 83D, 331176, G01R 2112, G04C 300, H03B 304
Patent
active
041596226
ABSTRACT:
An electronic timepiece having a main oscillator circuit and also having a secondary oscillator circuit for reducing the effect therefore of temperature on the accuracy of the timepiece is provided. The main oscillator circuit includes a first time standard and produces a high frequency time standard signal having a first frequency rate that is determined at least in part by the temperature characteristic of the first time standard. The secondary oscillator circuit includes a second time standard and produces second high frequency time standard signals having a second predetermined frequency determined at least in part by the temperature characteristic of the second time standard. Phase detection circuitry is provided for producing a phase detection signal in response to detecting a predetermined frequency difference in phase between the first and second high frequency time standard signals. A display is provided for displaying actual time in response to receiving a low frequency time signal produced by divider circuitry. A frequency adjustment circuit is coupled intermediate the phase detection circuitry and the divider circuitry for adjusting the frequency of the low frequency time signal produced by the divider circuitry in response to the phase detection signal being applied thereto.
REFERENCES:
patent: 3451210 (1969-06-01), Helterline, Jr. et al.
patent: 3508391 (1970-04-01), Lee
patent: 3881310 (1975-05-01), Gerum et al.
patent: 3938316 (1976-02-01), Morokawa et al.
patent: 3978650 (1976-09-01), Hashimoto et al.
patent: 3999370 (1976-12-01), Morokawa et al.
patent: 4023344 (1977-05-01), Mukaiyama
patent: 4068462 (1978-01-01), Duff et al.
Kabushiki Kaisha Suwa Seikosha
Witkowski Stanley J.
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