Magnetic disk apparatus and a thermal asperity compensation meth

Details Magnetic disk apparatus and a thermal asperity compensation meth Magnetic disk apparatus and a thermal asperity compensation meth

1997-01-23

1998-12-08

Hindi, Nabil

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 67, G11B 509

Patent

active

058478906

ABSTRACT:
A magnetic disk apparatus includes a reproducing circuit for reproducing a signal recorded in a medium, a reproduced signal processing controller having a TA compensation mode to effectively control reproduced signal processing in accordance with generation of TA, a reproduced signal processor for processing the reproduced signal output from the reproducing circuit under the control of the reproduced signal processing controller, and an HDC. The reproduced signal processing controller has a TA detection level setting means for setting the TA detection level, a TA detecting means for detecting a TA component from the reproduced signal by using the detection level set by the TA detection level setting means, a resistance value setting means for setting the resistance value of the rheostat of a TA cancel filter, an AGC hold time setting means for setting the TA hold time of an AGC, a PLL hold time setting means for setting the TA hold time of a PLL, a sync byte detecting means for detecting sync byte data in accordance with the format in which a plurality of sync byte data are arranged to be separated from each other, and a central processing unit for integrally controlling these means. When the TA detecting means detects generation of the TA, the reproduced signal processing controller shifts to the TA compensation mode and controls the reproduced signal processor in accordance with an operation defined in this mode.

REFERENCES:
patent: 4777542 (1988-10-01), Ozaki
patent: 4914398 (1990-04-01), Jove et al.
patent: 5233482 (1993-08-01), Galbraith et al.
patent: 5708537 (1998-01-01), Galbraith et al.
patent: 5715110 (1998-02-01), Nishiyama et al.

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