公开(公告)号：JP2002074842A

公开(公告)日：2002-03-15

申请号：JP2000250679

申请日：2000-08-22

Applicant: IBM

Inventor： BUSH GREGORY SCOTT ,  JOHN JEFFREY STEPHANSON

IPC: G11B20/10

Abstract: PROBLEM TO BE SOLVED: To provide a method which prevents the gain and a timing loop from being relative to an equivalent algorithm and also eliminates restriction to be applied to the FIR tap weight. SOLUTION: The direction is calculated to move every tap weight and the new tap weight is decided in the direction of every tap weight. The gain of an FIR filter of the new tap weight is compared with its prescribed threshold. The gain of the gain loop of a data channel is incrementally controlled in response to the gain value to be compared and the prescribed gain threshold. The phase lag of the FIR filter of the new tap weight is compared with the prescribed phase lag threshold. Then the phase of a timing loop of the data channel is incrementally controlled in response to the phase lag value to be compared and the prescribed phase lag threshold.