Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2008-07-22
2008-07-22
Wellington, Andrea (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
Reexamination Certificate
active
10944506
ABSTRACT:
Systems and techniques relating to interpreting signals on a noisy channel with polarity uncertainty. A signal processor, such as a read channel transceiver device usable in a magnetic recording system, includes a detector operable to find a data pattern that indicates control information in a read signal and to determine a signal polarity of the read signal by determining Euclidean distances between a sampled sequence from the read signal and multiple possible sequences corresponding to preamble-shifted and polarity-reversed versions of the data pattern. The read signal is obtained from a partial response channel, such as in a storage device, and the data pattern can be a servo mark selected based on Euclidean distances between the servo mark and preamble-shifted and polarity-reversed versions of the servo mark generated according to a target channel and an encoding scheme specified for the storage medium.
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Han Ke
Wu Zining
Davidson Dan I
Marvell International Ltd.
Wellington Andrea
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