Patent ID: 7038983

Claim:
A data reproduction apparatus comprising: reproduction means of reproducing data recorded in the recording medium; clock count means of counting clocks based on the data reproduced from said recording medium; window generation means of estimating the position of a synchronization signal in said reproduced data based on the count value of said clocks and generating a synchronization detection window signal having a predetermined width including the estimated position, wherein said window generation means detects said defect, and if the width of said window signal is changed, continues to change the width of said synchronization detection window signal for a predetermined period of time after the detection of said defect ends; synchronization signal detection means of detecting the synchronization signal from the data reproduced from said recording medium by searching within said synchronization detection window; and defect detection means of detecting a defect on said recording medium based on the data reproduced from said recording medium; wherein said window generation means changes the width of said synchronization detection window signal at least for a period of time during which said defect is detected; and wherein said window generation means detects said defect, and if the width of said window signal is changed, continues to change the width of said synchronization detection window signal for a predetermined period of time after the detection of said defect ends.