Master oscillator synchronizing system

Details Master oscillator synchronizing system Master oscillator synchronizing system

1977-03-11

1978-05-30

Safourek, Benedict V.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 512

Patent

active

040926729

ABSTRACT:
A synchronizing system is provided for synchronizing an oscillator having two or more substantially different frequencies, developed by division of the oscillator output frequency, from an external reference signal. The external reference is utilized as one input to a phase detector and to reset the divider. The divider is re-enabled by the external reference so that the next divider output is applied to the other input of the phase detector. The two inputs to the phase detector are now timed within a narrow range, which is within the pull-in range of the control loop, which minimizes the phase lock up time for synchronizing to the external reference.

REFERENCES:
patent: 3904823 (1975-09-01), Van Straaten
patent: 4025951 (1977-05-01), Elkenbrecht

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