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US 4,305,041 AGranted
Time compensated clock oscillator
AssigneeRockwell International Corporation
InventorMarvin E. Frerking
Life of this patent
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Abstract
A time compensated clock oscillator is disclosed that has a first low power oscillator that drives an output device such as a time-of-day clock, a second more precise oscillator whose output is compared to the output of the first oscillator, and develops a correction signal that is used to periodically correct the output device.
Claims11
A time compensated clock oscillator, comprising:
- means for generating a first and second frequency;
- means for comparing the first frequency with the second frequency including, means for mixing the first frequency with the second frequency to obtain a beat frequency, and means for combining the beat frequency with the second frequency;
- means for generating a correction signal that results from the comparison of the first frequency with the second frequency;
- and
- an output device controlled by the first frequency and the correction signal.
2 more elements
A method for time compensating a clock oscillator comprising:
- generating a first and second frequency;
- comparing the first frequency with the second frequency including the steps of mixing the first frequency with second frequency to obtain a beat frequency, and combining the beat frequency with the second frequency;
- generating a correction signal that results from the comparison of the first frequency with the second frequency;
- controlling an output device with the first frequency and the correction signal.
1 more element
Dependencies are inferred from the claim text.