DIGITAL TELEVISION SYNCHRONIZATION

摘要

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 an identification circuit 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.