DC-offset compensation loops for magnetic recording system

Details DC-offset compensation loops for magnetic recording system DC-offset compensation loops for magnetic recording system

2007-10-23

2007-10-23

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

C327S307000, C375S319000, C375S341000, C375S350000

Reexamination Certificate

active

11463280

ABSTRACT:
An apparatus, method, and system for providing dc offset reduction in a communications channel include two or more feedback loops to generate dc offset correction signals, which in turn are combined with an input analog signal and a processed digital signal thereby reducing dc offset. Each feedback loop may include an adaptive filter. At least one feedback loop may be responsive to an error signal that represents the difference between the delayed input of a first detector, and its output. Further, the dc offset correction signal, partially delayed, may be added to the error signal, thereby improving the response time of the dc offset correction loop.

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