| 摘要 |
The present invention provides an information reproducing method which does not need to insert a special pit row for detecting a phase error but can extract phase error information for producing a reproduction clock from a reproduced signal. This method specifically includes: arranging a cell of a decreased multivalued degree having information recorded by one M-value (M<N) in one part of recorded information, e.g., at each cell having information recorded by an N-value (N>=3); sampling a reproduced signal when the center of a light spot comes to the center of the cell recorded by the M-value, and detecting the cell center value; and obtaining a phase error for producing a reproduction clock based on a previously derived ideal value of the cell center value, a previously derived gradient of the reproduced signal in the vicinity of the ideal value of the cell center value, and the detected cell center value.
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