Clock synchronization circuit for control of traffic signals

Details Clock synchronization circuit for control of traffic signals Clock synchronization circuit for control of traffic signals

1983-01-21

1984-09-18

Groody, James J.

Communications: electrical

Traffic control indicator

Intersection normally under local controller

340912, 340931, 340333, G08G 107, G08B 100

Patent

active

044727143

ABSTRACT:
A device used in the control of automobile traffic signal systems for maintaining a local time reference during periods when the a.c. power is interrupted. An accurate oscillator such as a crystal controlled oscillator is used to provide a local time reference during power interruptions. The device maintains a local clock in synchronism with the a.c. power when the power is present and maintains the time reference in synchronism with the crystal oscillator during those periods when the a.c. power is absent. Pulse trains at different rates generated in synchronism with the oscillator are combined to achieve these objects.

REFERENCES:
patent: 3175183 (1965-03-01), Willyard
patent: 3509358 (1970-04-01), Guido
patent: 3818429 (1974-06-01), Meyer
patent: 3825890 (1974-07-01), Miyazato
patent: 4008404 (1977-02-01), Foreman

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