发明名称 |
Reverse concatenation for product codes |
摘要 |
Method and computer program product are provided to encode data for recording onto media whereby modulation and linear constraints from a concatenated code or product code are imposed. A first array of unencoded user data is generated. Each row is modulation encoded to enforce a first modulation constraint; the array is transformed into a second array which is transformed into a third array having predetermined empty locations in each column interleaved with the modulated data. A C2-parity byte is computed for at least some of the empty locations of the third array and a fourth array is generated. C1-parity symbols in each row are computed, generating a fifth array. A second modulation constraint is enforced on each C1-parity symbol in each row of the fifth array, generating a sixth array. The rows of the sixth array are assembled with header and sync fields for recording onto a recording media.
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申请公布号 |
US7873894(B2) |
申请公布日期 |
2011.01.18 |
申请号 |
US20070690635 |
申请日期 |
2007.03.23 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
ELEFTHERIOU EVANGELOS S.;HUTCHINS ROBERT A.;MITTELHOLZER THOMAS;SEGER PAUL J. |
分类号 |
H03M13/00 |
主分类号 |
H03M13/00 |
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