Information reproducing method judging a multivalued level of a present cell by referring to judged multivalued levels of a preceding cell and an ensuing cell

Abstract

A mark representing information of a multivalued level is recorded in each of cells arranged in a recording medium. Upon reproducing the multivalued level from a reproduction signal of the recording medium, the multivalued level of a present cell is judged by referring to a judged multivalued level of a preceding cell preceding the present cell or an ensuing cell ensuing the present cell, or by referring to the judged multivalued levels of both the preceding cell and the ensuing cell.

1 - 4 . (canceled)  
   
   
       5 . An information reproducing method for reproducing a multivalued level from a reproduction signal of a recording medium in which a mark representing information of said multivalued level is recorded on a cell using a reproducing beam that covers three marks, the method comprising: 
 a judging step of judging a multivalued level of a present cell by referring to a judged multivalued level of at least one of a preceding cell preceding said present cell and an ensuing cell ensuing said present cell.    
   
   
       6 . The information reproducing method as claimed in  claim 5 , wherein said judging step judges the multivalued level of said present cell by referring to a multivalued level of said preceding cell.  
   
   
       7 . The information reproducing method as claimed in  claim 5 , wherein said judging step judges the multivalued level of said present cell by referring to a multivalued level of said ensuing cell.  
   
   
       8 . The information reproducing method as claimed in  claim 5 , wherein said judging step judges the multivalued level of said present cell by referring to multivalued levels of said preceding cell and said ensuing cell.  
   
   
       9 - 61 . (canceled)