Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Patent
1998-03-04
2000-11-28
Moise, Emmanuel L.
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
714795, 714796, G11C 2900
Patent
active
061548677
ABSTRACT:
A data-reproducing device includes: a subtraction absolute value circuit for calculating a substraction absolute value from pre-equalized reproduce data and estimate data output from RAM, outputting the subtraction absolute value as branchmetrics; a comparison and selection circuit for comparing addition values of the branchmetrics and previously calculated pathmetrics are added, selecting a smaller one of the values as the result of comparison, outputting the smaller one of the values as new pathmetric as well as a selection signal as to which of the values is selected; a path memory circuit for storing the selection signal, obtaining the most probable path by unifying paths, outputting the most probable data according to the most probable path; a RAM circuit for outputting estimate data judged to be closest to the pre-equalized reproduce data by using a present output of the path memory circuit as an address; and a data correction circuit for renewing an internal data of the RAM circuit based upon a data obtained by using, as an address, the pre-equalized reproduce data delayed by a predetermined value and continuous data output from the path memory circuit.
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Moise Emmanuel L.
NEC Corporation
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