Method of creating correction table for head position...

Details Method of creating correction table for head position... Method of creating correction table for head position...

Filed on

2011-01-11

Date issued

2011-01-11

Examiner

Wong, K. (Department: 2627)

Patent Class

Dynamic magnetic information storage or retrieval

SubClass

Automatic control of a recorder mechanism

SubSubClass

Controlling the head

Other Related Categories

C360S075000

Type

Reexamination Certificate

Status

active

Patent number

07869156

Description

ABSTRACT:
A head position control method controls the position of a head by correcting components synchronizing rotation of a disk based on the head control amount. A correction signal for components synchronizing rotation is generated by using a filter function. The filter function that integrates the sine and cosine terms of DFT and inverse DFT and forms multiply of the complex values a(m) and b(m) and sine and cosine for frequency conversion, is measured in advance. The complex values are the m degree of RRO frequencies having frequency characteristics to be multiplied (1+C(z) P(z)) or −(1+C(z) P(z)/P(z)).

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