| 摘要 |
A sync detecting and protecting circuit for use in a reproducing apparatus is provided. The sync detecting and protecting circuit has a first detector for detecting a pre-amble pattern of the digital data received from the recording medium and for outputting a corresponding area signal, a second detector for detecting a sync of the received digital data, for comparing the detected sync and a predetermined sync pattern, and for outputting a sync detection signal, an ID separator for separating the ID code following the detected sync, for comparing the separated ID with those of the previous track and sync block, and for outputting an ID comparison signal, and a control signal generator for generating a sync control signal on the basis of the sync detection signal and the ID comparison signal, and for generating a pseudo-sync control signal if the detected sync has an error. Therefore, the sync used for detecting data at a predetermined position is accurately detected and a pseudo-sync control signal is generated even if an error is found in the sync, thereby enabling the correct detection of the data in the predetermined position.
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