DEVICE FOR DETECTING FRAME SYNCHRONIZATION SIGNAL WHICH REDUCES DATA DEMODULATION ERROR IN OPTICAL DISK SYSTEM AND DETECTING METHOD THEREFOR, CONCERNED WITH REDUCING DATA DEMODULATION ERROR

摘要

PURPOSE: A device for detecting a frame synchronization signal which reduces a data demodulation error in an optical disk system is provided to output a valid synchronization signal detected from an insertion synchronization signal generation section as a frame synchronization signal, thereby reducing a data demodulation error. CONSTITUTION: A synchronization signal detector(110) detects a synchronization signal from a digital data signal, and outputs the detected signal. A main frame synchronization signal generator(120) detects the first valid synchronization signal to output the signal as an inner frame synchronization signal, generates the first insertion synchronization signal if the first valid signal is not detected, and outputs the generated signal as the inner frame synchronization signal. A sub frame synchronization signal generator(130) detects the second valid synchronization signal, and outputs the detected signal. The first output portion(140) outputs a frame synchronization signal in response to the inner frame synchronization signal and the second valid synchronization signal.