SYNC SIGNAL DETECTION CIRCUIT FOR DIGITAL AUDIO CIRCUIT OF HDTV

摘要

a synchronous signal detecting part which detects synchronous signal twelve bits and outputs logic 0 when continuously inputted logic 1; a counter load data part which presents various audio one frame counter load value; synchronous counter part which predicts the location of the synchronous signal and prevents a misdetecting of the synchronous signal by counting a clock; a logic operating part which operates AND logic by comparing the outputs of the synchronous signal detecting part and of the synchronous counter part; time delay part which presents the system clock of the each operating part; synchronous signal deciding part which decides the detected synchronous signal; resetting part which controls the whole system by the synchronous detecting signal; display part which marks the normal detecting condition of the synchronous using the light emitting device.