Abnormal synchronization signal cacelleration method

PURPOSE: A method for removing an abnormal synchronous signal is provided, which is for a digital record play apparatus or a digital transceiver apparatus detecting only an actual synchronous signal by removing abnormal synchronous signals different from a desired synchronous signal. CONSTITUTION: A synchronous signal of a fixed pattern data is detected from inputted digital data(S101). It is judged whether the detected synchronous signal is detected above N times periodically, where N is an integer above 1(S102). If the synchronous signal is detected periodically above N times, it is judged to be an actual synchronous signal. and otherwise, the detected synchronous signal is canceled(S103,S104). It is judged whether the detected synchronous signal is generated by a burst error using a window generated at a position of a predetermined synchronous signal, and if there is no burst error, the detected synchronous signal is judged to be an actual synchronous signal, and if there is a burst error, the detected synchronous signal is canceled(S105,S106).