Horizontal synchronization signal stabilization method and appar

Details Horizontal synchronization signal stabilization method and appar Horizontal synchronization signal stabilization method and appar

1995-09-28

1998-08-04

Grant, Christopher C.

Television

Synchronization

Automatic phase or frequency control

348533, 348536, H04N 512

Patent

active

057902003

ABSTRACT:
An arrangement for stabilizing a horizontal synchronization signal, serving as an input signal for a phase-locked loop (PLL) for generating a clock signal, by separating the horizontal synchronization signal from a composite synchronization signal including both horizontal and vertical synchronization signals. A horizontal synchronization gate signal is generated for outputting a pulse signal approximately in phase with the horizontal synchronization signal and having at least the pulse width of the horizontal synchronization signal in accordance with the composite synchronization signal and a clock pulse signal having a predetermined frequency. The horizontal synchronization signal is retrieved from the composite synchronization signal in accordance with a logical product when matching the polarity of the horizontal synchronization gate signal with the polarity of the composite synchronization signal.

REFERENCES:
patent: 4780759 (1988-10-01), Matsushima et al.
patent: 4974081 (1990-11-01), Yokogawa
patent: 5502502 (1996-03-01), Gaskill et al.

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