发明名称 |
Method and apparatus for writing and protecting against random and cluster errors in image blocks |
摘要 |
A method and apparatus for encoding and detecting data which can be represented in a physical array of modules recorded on a medium. Information is encoded in "image-blocks". An image-block comprises a plurality of "sub-blocks". Sub-blocks comprise a plurality of "modules". A module is the smallest unit of information within the image-block. Discrete contiguous portions of each sub-block of an image-block taken together are encoded into an outer codeword. A plurality of these outer codewords are generated and recorded across each sub-block. A portion of the information that is to be recorded within each sub-block is encoded in a plurality of inner error detection and correction codewords, each preferably stored entirely within one corresponding sub-block. Accordingly, small scattered random errors can be corrected locally by using information entirely contained within the sub-block. If a large area within a sub-block is corrupted, the information contained in each other sub-block may be used to reconstruct the data that was recorded in the corrupted sub-block. The inner codewords are "interleaved" to provide a maximum distance between parts of the same codeword.
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申请公布号 |
US5778011(A) |
申请公布日期 |
1998.07.07 |
申请号 |
US19950476517 |
申请日期 |
1995.06.07 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
BLAUM, MARIO;BRUCK, JEHOSHUA;PESTONI, FLORIAN;SAFAR, FELIX GUSTAVO EMILIO;SANZ, JORGE L. C. |
分类号 |
H03M13/27;H03M13/29;(IPC1-7):H03M13/00 |
主分类号 |
H03M13/27 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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