Reference signal producing circuit for phase servo control

Details Reference signal producing circuit for phase servo control Reference signal producing circuit for phase servo control

1989-09-07

1990-09-04

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, 358153, 358154, H04N 504, H04N 510

Patent

active

049548930

ABSTRACT:
This reference signal producing circuit includes circuits (3, 5) for separating a vertical synchronizing signal from a composite synchronizing signal, a timer (25) reset by a reference signal, a circuit (26) for comparing an output of the timer with a variable set value and producing a compensation signal having a variable period, and a reference signal output circuit (23) for supplying as a reference signal the separated vertical synchronizing signal or the compensation signal. Although the period of the compensation signal is usually set to a value slightly larger than that of a vertical synchronizing signal period, it is set to a value equal to the vertical synchronizing signal period in the case that the vertical synchronizing signal pulses within the composite synchronizing signal lack successively.

REFERENCES:
patent: 4556905 (1985-12-01), Ikejiri
patent: 4675734 (1987-06-01), Widom
patent: 4769704 (1988-09-01), Harai et al.
patent: 4897723 (1990-01-01), Arai

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