Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
2005-01-11
2005-01-11
Huber, Paul W. (Department: 2653)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
C369S053310, C369S124070, C369S275300
Reexamination Certificate
active
06842410
ABSTRACT:
A system and method are disclosed for providing a gain control signal for a multilevel read signal. In one embodiment, maximum automatic gain control marks are periodically inserted amongst a series of data fields. The automatic gain control marks include a series of high level marks such that the maximum signal detected in the interior portion of each maximum automatic gain control mark is not reduced by intersymbol interference. Minimum automatic gain control marks are also periodically inserted amongst a series of data fields. The automatic gain control marks include a series of high level marks such that the maximum signal detected in the interior portion of each minimum automatic gain control mark is not reduced by intersymbol interference. In another embodiment, multilevel signals are encoded to facilitate automatic gain control. The effect of a plurality of candidate merge symbols on the residual running total power associated with a current data block is determined. A preferred merge symbol is selected based on a residual running total power minimization criteria. The preferred merge symbol is added to the current data block.
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Lee David C.
Lo Yung-Cheng
Powelson Judith C.
Spielman Steven R.
Huber Paul W.
LSI Logic Corporation
Maiorana Christopher P.
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