公开(公告)号：JPH10241168A

公开(公告)日：1998-09-11

申请号：JP3144398

申请日：1998-02-13

Applicant: IBM

Inventor： ALAN KEITH BATES ,  NYAN SUAN BUI ,  ALAN AUGUST FENEMA ,  SENBA TETSUO

IPC: G11B11/10 ,  G11B7/085 ,  G11B7/09 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To overcome the problem of seek error due to disturbance of tracking error signal by calculating an approximate TES signal through linear interpolation and using it in place of an actual TES signal during a time interval when a hard sector is detected. SOLUTION: A TES interpolation circuit is activated during an interval when a hard sector detection circuit generates an output pulse to calculate the voltage variation rate of a TES signal continuously using an analog differentiator. A sample hold circuit is tracked by an integrator 162 having polar and zero positions being set to cancel the effect of a differentiation circuit 152. When no hard sector is present, an original TES signal passes through the circuit as it is but when a hard sector is detected, the sample hold circuit captures the final value of TES gradient. Finally, the integrator integrates the gradient and performs linear interpolation of the TES signal.