Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-10-09
2007-10-09
Wong, K. (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
11164136
ABSTRACT:
A method and a circuit for compensating a slow-varying runout of a disk storage system are provided. First, generate a basic runout compensation signal (BRC signal) and according to a position signal extracted from the pickup head output generate a runout error signal (RE signal). Afterwards, when corresponding to a predetermined phase of the BRC signal, the RE signal is compared with a first predetermined error tolerance range (first PETR) and according to the comparison result it is decided whether the BRC phase needs to be adjusted; or/and when corresponding to a predetermined position of the BRC signal, the RE signal is compared with a second predetermined error tolerance range (second PETR) and according to the comparison result it is decided whether the BRC amplitude needs to be adjusted. Finally, a runout compensation signal obtained by adjusting the BRC signal is used for adjusting the pickup head position.
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Cheertek Inc.
Jianq Chyun IP Office
Wong K.
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