Synchronizing signal generation circuit

Details Synchronizing signal generation circuit Synchronizing signal generation circuit

1996-04-25

1997-11-11

Peng, John K.

Television

Synchronization

Sync generation

348524, 348545, H04N 506

Patent

active

056869681

ABSTRACT:
The present invention relates to a synchronizing signal generation circuit equipped with a PLL circuit. A pulse signal having a time constant that is broader than the clock width of a horizontal synchronizing signal included within synchronizing signals and that moreover contains steady-state phase error of the PLL circuit is generated and inputted to a phase comparison inhibiting circuit by way of a signal conversion circuit. The logic level of the pulse signal is then varied for the active interval and the inactive interval of the vertical synchronizing signal, phase comparison of the horizontal synchronizing signal and the reproduced horizontal synchronizing signal being inhibited during the active interval. The reproduced horizontal synchronizing signal is generated based on the output of two frequency dividers.

REFERENCES:
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patent: 4467359 (1984-08-01), Hosoya
patent: 4812783 (1989-03-01), Honjo et al.
patent: 5019907 (1991-05-01), Murakoshi et al.
patent: 5121206 (1992-06-01), Shibayama et al.
patent: 5319706 (1994-06-01), Mizukata et al.
patent: 5502502 (1996-03-01), Gaskill et al.

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