SYNCHRONIZING SIGNAL DETECTING DEVICE

摘要

A synchronizing signal detecting circuit which collates the pattern of a synchronizing signal superimposed upon the signal of an inputted data sequence by means of a pattern collating means (2) so as to detect the synchronizing signal of digital television signals transmitted in the form of digital signals. The synchronizing signal detecting circuit comprises a synchronization detecting and judging means (5) that outputs a synchronization detection signal representing a detected state of the synchronizing signal or a synchronization undetection signal representing an undetected state of the synchronizing signal based on the result of judgment on whether or not the collated pattern agrees with a reference pattern, and a synchronization detection initializing means which forces the means (5) to output a synchronization undetection signal when the signal of the inputted data sequence is switched so as to detect the synchronizing signal in a shorter time than conventional.