Patent ID: 6014096
Filing Date: 2000-01-11
Classification: G11B

Abstract:
A data decoding method for playing back signals from a recording medium having recording codes recorded thereon, said recording codes being NRZI modulated codes having a minimum run length of ""0""s between neighboring ""1""s in a code string equal to d, said recording codes having a minimum run length of the same symbol equal to d'=d+1, comprising the steps of:generating n-tuples clocks obtained on n-tupling channel clocks of the playback data;detecting channel bit data having the run length of the same symbol equal to (d'-1) using said n-tupled clocks; anddesignating a correction position for detected channel bit data having the run length of the same symbol equal to (d'-1) for correcting the channel bit data so that the run length of the same symbol will be equal to d';wherein the signal read from the recording medium is decoded at least at a comparison level to output channel bit data; andwherein bit information obtained by bit data of a given channel clock and bit data of the next channel clock and n-tupled clocks sandwiched in-between is split with the comparison level as the boundary into H-level and L-level to give (n+1) items of domain information for designating a correction position of channel bit data having a run length of the same symbol equal to (d'-1).