公开(公告)号：JPH10283743A

公开(公告)日：1998-10-23

申请号：JP1625198

申请日：1998-01-28

Applicant: CIRRUS LOGIC INC

Inventor： RICHARD T BEHRENS ,  ZOOK CHRISTOPHER P ,  STEVEN A TARKE ,  REED DAVID E

IPC: G11B5/55 ,  G11B5/596 ,  G11B7/007 ,  G11B21/08 ,  G11B21/10 ,  G11B27/30

Abstract: PROBLEM TO BE SOLVED: To enable a servo code format for a high recording density by mapping the detected code word of adjacent tracks to the decoded code word indicating one adjacent track at the time of mapping two detected code words to one decoded code word to seek the selected track with a read head. SOLUTION: This decoder 84 performs the decoding to an effective track address of estimated data sequence even when a readout signal becomes ambiguous due to interference between tracks during the seek operation. That is, a binary track address is coded depending on the coding scheme for correcting random bit error and ambiguity generated as a result of interference between tracks during the seek operation can be solved to overcome the limitation on the servo gray code. After the correction, seven code word bits is mapped to the four information bits in order to decode the code word.