Method and circuit for providing a horizontal scan signal...

Details Method and circuit for providing a horizontal scan signal... Method and circuit for providing a horizontal scan signal...

2007-02-27

2007-02-27

Lee, Michael H. (Department: 2622)

Television

Synchronization

Automatic phase or frequency control

C348S531000

Reexamination Certificate

active

10626064

ABSTRACT:
A method for providing a horizontal scan control signal for a TV set from a horizontal synchronization signal contained in a composite video signal, the horizontal synchronization signal containing horizontal synchronization pulses and parasitic pulses, the scan control signal being provided from an oscillating signal generated by an oscillator of a phase-locked loop receiving the horizontal synchronization signal, the oscillating signal having a frequency depending on a driving signal provided from the comparison between the horizontal synchronization signal and a binary phase signal, in which, at each parasitic pulse among successive parasitic pulses between two synchronization pulses, the driving signal is successively varied in the increasing direction or in the decreasing direction.

REFERENCES:
patent: 4709268 (1987-11-01), Akimoto et al.
patent: 5189515 (1993-02-01), Chen
patent: 5319706 (1994-06-01), Mizukata et al.
patent: 6211920 (2001-04-01), Cirot et al.
French Search Report from French Patent Application 02/09770, filed Jul. 31, 2002.

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