Rate-7/8 maximum transition run code encoding and decoding...

Details Rate-7/8 maximum transition run code encoding and decoding... Rate-7/8 maximum transition run code encoding and decoding...

2006-02-28

2006-02-28

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

C341S050000, C341S058000

Reexamination Certificate

active

07006019

ABSTRACT:
A rate 7/8 MTR code encoding/decoding method and apparatus. The encoding method includes: generating a rate-7/8 MTR code for inputting 7-bit data and outputting a predetermined 8-bit codeword; checking whether codewords satisfy a predetermined constraint condition by connecting the 8-bit codeword and a subsequent 8-bit codeword; and if the codewords do not violate the constraint condition, not converting the codewords. The decoding method includes: checking whether the codewords satisfy a predetermined MTR constraint condition by connecting a current 8-bit codeword c(k) and a subsequent 8-bit codeword c(k+1); if the codewords violate the constraint condition, converting the codewords, and if the codewords do not violate the constraint condition, not converting the codewords; and decoding each converted 8-bit codeword into 7-bit data using a predetermined MTR code. Data is reliably reproduced with high write density, and large amounts of data are stored in and reproduced from a magnetic recording information storage medium.

REFERENCES:
patent: 4760378 (1988-07-01), Iketani et al.
patent: 6032284 (2000-02-01), Bliss
patent: 6032287 (2000-03-01), Kallas
patent: 6400288 (2002-06-01), Fredrickson et al.
patent: 6476737 (2002-11-01), Caroselli et al.

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