Method and apparatus for multi-standard digital television synch

Details Method and apparatus for multi-standard digital television synch Method and apparatus for multi-standard digital television synch

1996-04-30

1998-06-16

Britton, Howard W.

Television

Synchronization

Automatic phase or frequency control

348558, H04N 546

Patent

active

057679177

ABSTRACT:
An apparatus for automatically synchronizing a video system to one of a plurality of composite synchronizing signals in accordance with a plurality of known video formats, includes a number of synchronizing signal stripper circuits, corresponding, respectively, to a number of types of composite synchronizing signals, a horizontal analyzer, having a plurality of horizontal standard identification circuits corresponding to a identification circuits for each known horizontal synchronizing signal rate for each type of composite synchronizing signal, for determining an approximate horizontal synchronizing signal rate and, a vertical analyzer, having a plurality of vertical rate identification circuits corresponding to the number of different known vertical rates, for determining the vertical synchronizing signal rate.

REFERENCES:
patent: 2668193 (1954-02-01), Chapin
patent: 4679091 (1987-07-01), Kikuchi
patent: 4684987 (1987-08-01), Tsutsui
patent: 5124792 (1992-06-01), Shimoka
patent: 5541556 (1996-07-01), Francis
patent: 5657090 (1997-08-01), Friesen

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