Method and apparatus for providing thermal asperity compensation

Details Method and apparatus for providing thermal asperity compensation Method and apparatus for providing thermal asperity compensation

1998-03-27

2000-07-25

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 25, 360 61, 360 65, G11B 509, G11B 502, G11B 1512, G11B 5035

Patent

active

060943165

ABSTRACT:
The present invention is a method and apparatus for removing transient DC level shifts caused by thermal asperities. A read signal is generated by a transducer in response to proximate contact between the transducer and magnetic flux fields recorded on a magnetic media surface. The read signal is provided to a continuous time filter and a sampler. During normal operation, the output of the sampler is provided directly to a fixed delay tree search detector. Upon encountering a thermal asperity, the output of the sampler is first provided to a 1-D sampled filter which removes the DC shift caused by the thermal asperity and then to the fixed delay tree search detector, which provides signal recovery. A multiplexer provides selection of the output signal from between sampler and the 1-D sample filter.

REFERENCES:
patent: 5367409 (1994-11-01), Ottesen et al.
patent: 5781133 (1998-07-01), Tsang
patent: 5822143 (1998-10-01), Cioke et al.
patent: 5844920 (1998-12-01), Zook et al.
patent: 5862007 (1999-01-01), Pham et al.
patent: 5898532 (1999-04-01), Du et al.
patent: 5961658 (1999-10-01), Reed et al.

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