Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Patent
1998-06-04
2000-11-28
Moise, Emmanuel L.
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
714792, 714794, 714795, 375262, 375263, 375265, 375341, 341 94, H03M 1303
Patent
active
061548707
ABSTRACT:
A Viterbi PRML system and method providing a new code with distance properties such that some tribits are allowed but no longer sequences are allowed. A code rate 8/ 9 is constructed for EPR4 and E.sup.2 PR4 channels and the system independently maps 8-bit blocks of user data to 9-bit channel sequences. The precoder has transfer function, f(D)=1/(1.sym.D), and produces a binary channel input x(D), which is fed to a coder, to provide an output signal y(D), which is transmitted and corrupted by noise. The corrupted signal is received and fed to a Viterbi detector. The signal is decoded to produce an estimate of the 8-bit data bytes, as reconstructed to be freed from noise corruption. The encoding protocol of the invention is implemented in the encoder. The protocol is: no sequence of 4 consecutive transitions occurs in any 9-bit codeword; no 9-bit codeword ends with a sequence of 2 or more consecutive transitions; no 9-bit codeword begins with more than 2 consecutive transitions; and sequences of 3 consecutive transitions, if any, begin only on a 2nd, 4th, 6th, or 9th bit of said 9-bit codeword. The protocol is preferably augmented by an additional constraint: no 9-bit codeword has the same 1st, 3rd, 5th, 7th, and 9th bit. Other limitations on coding are described to enhance the performance of the system.
REFERENCES:
patent: 4945538 (1990-07-01), Patel
patent: 5095484 (1992-03-01), Karabed et al.
patent: 5280489 (1994-01-01), Fredrickson et al.
Dehmohseni Reza M.
Fredrickson Lisa
Dempster Shawn B.
Heller III Edward P.
Moise Emmanuel L.
Olson Jonathan E.
Seagate Technology LLC
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