Redundant clock system utilizing nonsynchronous oscillators

Details Redundant clock system utilizing nonsynchronous oscillators Redundant clock system utilizing nonsynchronous oscillators

1979-04-02

1981-03-03

Miska, Vit W.

Horology: time measuring systems or devices

Time interval

Electrical or electromechanical

368200, 331 49, G04F 800, G04B 1712, H03B 2700

Patent

active

042544920

ABSTRACT:
A clock system is disclosed having two identical clocks not synchronized with each other. Each of the clocks includes a circuit for selecting the output of one of the clocks as the present system output. Further, each clock includes logic for detecting errors in the operation of itself, and of the other. When an error is detected in the operation of the clock selected to be the present system output, a switchover sequence control switches the output signal of the nonselected clock to become the new system output. The switchover sequence control includes a feature which ensures that the interval between pulses in the system output is greater than a predetermined period in order to minimize detrimental effects on circuitry utilizing the clock system output.

REFERENCES:
patent: 3431510 (1969-03-01), Reis et al.
patent: 3599111 (1971-08-01), Butler, Jr. et al.
patent: 3628158 (1971-10-01), Sjoquist
patent: 3708686 (1973-01-01), Butler, Jr. et al.
patent: 4156200 (1979-05-01), Gomez

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