Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Patent
1997-09-30
2000-03-07
Moise, Emmanuel L.
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
341 59, 375341, 375348, G06F 1110, H03M 1312
Patent
active
060354356
ABSTRACT:
A system and method are described for avoiding catastrophic error sequences in a media code sequence of symbols for data storage on a storage medium according to EPRML. The system and method includes modulation encoding user data which is to be stored on the storage medium using a modulation encoder. The modulation encoder outputs a channel code modulation output symbol sequence. The modulation code is defined according to a modulation criteria wherein the set of all possible modulation output symbol sequences is constrained in a manner which excludes certain excluded modulation output symbol sequences. A precoder precodes the channel code modulation output symbol sequence according to a precoding transfer function. The precoding transfer function transforms the channel code modulation output symbol sequence into a media code sequence of symbols and the preceding transfer function is defined so that when modulation encoding is performed according to the modulation criteria, the media code sequence of symbols is constrained to exclude EPRML catastrophic error sequences of greater than a determined length. The combination of the modulation encoding and the precoding prevents the media code sequence of symbols from including EPRML catastrophic error sequences greater than the determined length.
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Shih Shih-Ming
Thapar Hemant
Datapath Systems, Inc.
Moise Emmanuel L.
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