Method and apparatus for correcting multibyte errors having impr

Details Method and apparatus for correcting multibyte errors having impr Method and apparatus for correcting multibyte errors having impr

1985-09-27

1987-11-10

Atkinson, Charles E.

Excavating

371 38, G06F 1110

Patent

active

047062509

ABSTRACT:
A system for correcting errors in data read from a direct access storage device employs an extendable, two-level coding scheme having n subblocks in a relatively long variable-length block of data, each subblock having up to m bytes of data. At the subblock level, decoding capability provides correction of up to t.sub.1 errors and detection of up to t.sub.1 +c errors in each subblock, while the block-level decoding capability provides correction of up to t.sub.2 errors in any one of the subblocks. The combined capability of the system corrects any combination of (t.sub.1 +x) errors in one subblock, and up to t.sub.1 errors in any or all of the other subblocks in the block, where x is a non-negative integer such that (t.sub.1 +x).ltoreq.t.sub.2 and x<c. The combined capability of the system also provides correction of any combination of (t.sub.1 +x) errors in one subblock and up to (t.sub.1 +C-x) errors in any or all of the other subblocks in the block, where x is an integer such that (t.sub.1 +x).ltoreq. t.sub.2 and x>c.

REFERENCES:
patent: 4447902 (1984-05-01), Wilkinson
patent: 4494234 (1985-01-01), Patel
patent: 4504948 (1985-03-01), Patel
patent: 4525838 (1985-06-01), Patel
patent: 4559568 (1985-12-01), Watanabe et al.
patent: 4562578 (1985-12-01), Odaka et al.
patent: 4630272 (1986-12-01), Fukami et al.

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