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

G - Physics

11

B

352/21.1

G11B 15/467 (2006.01) G11B 15/473 (2006.01) H04N 5/12 (2006.01) H04N 5/932 (2006.01) H04N 5/94 (2006.01)

Patent

CA 1309175

ABSTRACT OF THE DISCLOSURE 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.

610663

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