Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1997-07-11
1999-12-21
Kim, W. Chris
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 46, G11B 509
Patent
active
060057300
ABSTRACT:
A Class IV Partial Response Maximum Likelihood data channel for analog signal processing of a disk drive signal in tracking mode includes a signal error generating circuit for "folding" the analog disk drive signal around the three PR-IV target values of +1, -1 and 0. Using the smaller error signal rather than the larger analog disk drive signal by which the disk drive signal deviates from the target values results in significant power saving with no reduction in electronic signal to noise ratio. An integrated error generating circuit generates both a gain error signal and a timing error signal from the folded error signal for feedback control of the data channel variable gain amplifier and variable clock oscillator. Shared processing of the timing and gain error signals results in power savings and simpler circuitry.
REFERENCES:
patent: 4970609 (1990-11-01), Cunningham et al.
Davidson Dan I.
International Business Machines - Corporation
Kim W. Chris
Kolehmainen Philip M.
Pennington Joan
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