Auxiliary timing source for ac-powered electronic clocks

Details Auxiliary timing source for ac-powered electronic clocks Auxiliary timing source for ac-powered electronic clocks

1985-04-17

1987-01-06

Roskoski, Bernard

Horology: time measuring systems or devices

Regulating means

For adjusting the frequency or beat

368203, 368155, G04B 1712

Patent

active

046342885

ABSTRACT:
An apparatus and method that provides an auxiliary timing source for electronic clocks, normally powered by alternating current (ac). The apparatus and method includes calibrating an inexpensive resistor-capacitor oscillator, powered by a battery. The oscillator is calibrated during normal ac operation by comparing a digital timing pulse derived from the oscillator and a digital timing pulse derived from the alternating current. When a power failure occurs, the calibrated oscillator provides an inexpensive and accurate auxiliary timing source. The apparatus and method may also include a non-volatile solid-state storage medium for storing the time of day and a set of timing instructions in the event that the battery becomes drained.

REFERENCES:
patent: 4068465 (1978-01-01), Bacon
patent: 4145617 (1979-03-01), Lee et al.
patent: 4335847 (1982-06-01), Levine
patent: 4407019 (1983-09-01), Futami et al.
patent: 4469274 (1984-09-01), Levine
patent: 4531064 (1985-07-01), Levine

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