Coding/decoding method for reproducing data in high density and

Details Coding/decoding method for reproducing data in high density and Coding/decoding method for reproducing data in high density and

1997-10-29

2000-08-15

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

341 59, H03M 500

Patent

active

061043249

ABSTRACT:
A coding/decoding method for high density data recording/reproduction, and an encoder/decoder. In the coding method for encoding an 8-bit binary data symbol X.sub.k (k=1, 2, 3, . . . , 8), received from a storage device or a communications channel, into a 9-bit codeword Y.sub.l (l=1, 2, 3, . . . , 9), the number of a maximum transition run (MTR) is limited to a predetermined number, and the number of zero run lengths of the codeword whose MTR is limited is then limited to a predetermined number. Then, a pattern providing a bad effect on detection of a signal is removed from the codeword whose zero run length is limited. In the rate 8/9 modulation code having an MTR of 3, the code rate is high, and the path of the Viterbi detector is reduced as in the rate 2/3 RLL(1,7) code having an MTR of 2, thereby decreasing the delay and complexity of the detector. Also, in order to control the timing and gain control, the k constraint is to 7 such that the signal is easily detected while maintaining self-clocking characteristics of the signal.

REFERENCES:
patent: 5537112 (1996-07-01), Tsang
patent: 5731768 (1998-03-01), Tsang
patent: 5739779 (1998-04-01), Kunisa et al.
patent: 5774077 (1998-06-01), Schouhamer Immink
patent: 5859601 (1999-01-01), Moon et al.

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