BROADCASTING SYSTEM DISCRIMINATION APPARATUS, AND BROADCASTING SYSTEM DISCRIMINATION METHOD

摘要

PROBLEM TO BE SOLVED: To solve a problem in a conventional broadcasting system discrimination apparatus that it takes much time to discriminate a broadcasting system because it takes much time to discriminate whether an APC (Auto Phase Control) circuit is locked or not in the case of discriminating the broadcasting system.;SOLUTION: The amplitude of a color signal received externally is controlled, a burst gate pulse received externally is used to extract a burst signal from the color signal whose amplitude is controlled, the burst signal is delayed by each of prescribed periods to produce first to fourth delay signals, the fourth delay signal is subtracted from the burst signal and an absolute value is obtained from the result, the absolute value is integrated and the result is compared with a prescribed threshold value for discrimination of the broadcast system of the color signal.;COPYRIGHT: (C)2003,JPO