Method and apparatus for encoding data with variable block lengt

Details Method and apparatus for encoding data with variable block lengt Method and apparatus for encoding data with variable block lengt

1995-05-08

1996-11-12

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

382245, H03M 746

Patent

active

055744486

ABSTRACT:
An encoding system uses a modified 8/9 rate modulation code to encode 8-bit data symbols into 9-bit cells in a conventional manner in accordance with the modified code and 9-bit ECC symbols into 10-bit cells by (i) encoding 8 bits of the symbol into a 9-bit cell in accordance with the modified code, and (ii) inserting into the 9-bit cell the remaining, that is, the non-encoded, bit of the ECC symbol. The system reproduces the 8-bit data symbols by decoding the 9-bit cells in a conventional manner in accordance with the modified code, and the 9-bit ECC symbols by (i) removing from the associated 10-bit cell the bit inserted during encoding, (ii) decoding the remaining 9 bits to reproduce 8 bits of the symbol, and (iii) inserting into the 8 bits the bit that was earlier removed. In an exemplary embodiment, the 8 least significant bits of the ECC symbol are encoded using the modified 8/9 rate code. The 9 bits produced by the code are used essentially as the first "c" bits and last "10-c" bits of a 10-bit cell. The most significant bit of the ECC symbol is included in the cell as the c+1.sup.st bit. The mapping of 8 bits to 9-bit cells is such that the inclusion of this c+1.sup.st bit does not violate the code's run length limitations, either within the cell or within a modulation code word, which is a concatenation of the cells. The system can similarly encode, using a modified n/m rate code, n-bit and (n+i)-bit symbols, where (n+i)<m, to produce, respectively, m-bit cells and (m+i)-bit cells.

REFERENCES:
patent: 4760378 (1988-07-01), Iketani et al.

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