公开(公告)号：JPH09219005A

公开(公告)日：1997-08-19

申请号：JP34431896

申请日：1996-12-24

Applicant: CIRRUS LOGIC INC

Inventor： ARAN JIEI AAMUSUTORONGU ,  KURISUTOFUAA PII ZUUKU

IPC: G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B19/04 ,  G11B20/10 ,  G11B20/18 ,  H03M13/00 ,  H03M13/15

Abstract: PROBLEM TO BE SOLVED: To obtain a compensation device in which complexity or redundancy is not remarkably increased without being affected by a software error by using a disappearance pointer for compensating influence of thermal asperity. SOLUTION: A thermal asperity(TA) detector 43 detects occurrence of thermal asperity by detecting saturation of an A/D sampling value 25 outputted by a sampling device 24. When occurrence of thermal asperity is detected, a pole of an AC coupling capacitor 55 is raised up through a line 46, loops of a timing recovery circuit 28, a gain controller 51 and a DC offset circuit 44 of a read-out channel is kept constant through a line 45, and a disappearance pointer is generated. And an on-the-fly error detector and correction circuit(EDAC) circuit process the disappearance pointer, and a discrete time sequence detector 34 corrects an error generated in a presumption digital sequence detected from the sampling value 25.