Sync detection device for an optical disk player and method for detecting sync

摘要

A sync detection device for an optical disk player. The generation of sync insertion signals is stopped when a sync detection signal is normally generated after a sync protection window signal is out of sync with the sync detection signal. A sync insertion and protection device sets a sync protection window according to a sync detection signal from a sync detector in response to a reset signal. The sync insertion and protection device counts a playback clock to generate a sync protection window signal if the count value is coincident with a position where the sync signal is to be generated, and generates a sync insertion signal in response to a sync insertion request. A sync generator outputs the sync protection window signal if the sync detection signal is in sync with the sync protection window signal, and outputs the sync insertion signal if the sync detection signal is out of sync with the sync protection window signal. A sync noise canceller counts the playback clock during generation of the sync detection signal, and generates the reset signal to the sync insertion and protection device if the count value reaches a predetermined value.