Encoding method for PRML system, method of and apparatus for dem

Details Encoding method for PRML system, method of and apparatus for dem Encoding method for PRML system, method of and apparatus for dem

1996-03-18

1998-07-07

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

371 43, G11B 2018

Patent

active

057775664

ABSTRACT:
Disclosed are an encoding method and demodulating method for a PRML system for maximum-likelihood-detecting and demodulating a encoded partial response signal. The encoding method comprises a step of segmenting an input data string into 4-bit data and a step of converting the 4-bit data into 6-bet code words Y={001011, 001101, 001110, 010011, 010110, 011001, 011010, 011100, 100011, 100101, 100110, 101001, 101100, 110001, 110010, 110100}. The demodulating method includes a maximum likelihood detection step by use of a trellis transition, said trellis transition includes path transitions between status A groups {001A, 010A, 100A, 011A, 101A, 110A} constituting last-half 3 bits of the 6-bit code word and status B groups {001B, 010B, 100B, 011B, 101B, 110B} constituting first-half 3 bits of the 6-bit code word and path transitions from the status B groups to the status A groups including path transitions from 011B, 101B, 110B to 001A, 010A, 100A excluding the path transition from 101B to 010A and path transitions from 001B, 010B, 100B to 011A, 101A, 110A excluding the path transition from 010B to 101A.

REFERENCES:
patent: 4502036 (1985-02-01), Furukawa
patent: 4609907 (1986-09-01), Adler et al.
patent: 5457705 (1995-10-01), Todoroki

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