Rate 24/25 modulation code for PRML recording channels

Details Rate 24/25 modulation code for PRML recording channels Rate 24/25 modulation code for PRML recording channels

1996-12-31

1998-05-26

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

To or from multi-level codes

341 58, H03M 700

Patent

active

057572941

ABSTRACT:
Rate 24/25 modulation encoding methods and apparatus improve efficiency in a PRML magnetic recording channel. The rate 24/25 code word uses rate 8/9 RLL encoding of one byte of user data, combined with interleaved unencoded bytes to achieve improved code rates with reasonable global run length constraint. Use of the the rate 8/9 RLL (0,3) subcode results in a rate 24/25 RLL (0,11) code, while a rate 8/9 (0,6/5) subcode results in a rate 24/25 RLL (0,14/13) code.

REFERENCES:
patent: 5260703 (1993-11-01), Nguyen et al.
patent: 5291500 (1994-03-01), Patel et al.
patent: 5304997 (1994-04-01), Konno
patent: 5321397 (1994-06-01), Stone
patent: 5349349 (1994-09-01), Shimizume
patent: 5635933 (1997-06-01), Fitzpatrick et al.
patent: 5668545 (1997-09-01), Chen

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