Sliding block (rate 8/9) trellis code for magnetic recording

Details Sliding block (rate 8/9) trellis code for magnetic recording Sliding block (rate 8/9) trellis code for magnetic recording

1998-05-13

2000-06-27

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

714794, 714795, H03M 700

Patent

active

060812109

ABSTRACT:
A method and system for encoding user data bits for magnetic recording channels that produces a stationary trellis and that limits the burst error propagation to three user bytes. The input data bits are grouped into even bytes and odd bytes. The even bytes are encoded first into even codewords, then each of the odd bytes is encoded into odd codewords based on the even codeword for the even byte preceding each odd byte and on the even codeword for the even byte following each odd byte. The encoding eliminates the most common error events associated with Partial Response Maximum Likelihood channels by: (i) disallowing sequences of four consecutive ones in the codewords, (ii) allowing sequences of three consecutive ones to begin only on certain bit positions in certain codewords, (iii) allowing only certain beginning sequences and ending sequences for odd and even codewords in specific situations, and (iv) changing specific bits in the odd and even codewords based on disallowed codeword sequences.

REFERENCES:
patent: 5196849 (1993-03-01), Galbraith
patent: 5327440 (1994-07-01), Fredrickson et al.
patent: 5422760 (1995-06-01), Abbott et al.
patent: 5537112 (1996-07-01), Tsang
patent: 5576707 (1996-11-01), Zook
patent: 5635933 (1997-06-01), Fitzpatrick et al.
patent: 5691993 (1997-11-01), Abbott et al.
patent: 5757822 (1998-05-01), Fisher et al.

Affiliated with

Also associated with

Rating

Sliding block (rate 8/9) trellis code for magnetic recording does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sliding block (rate 8/9) trellis code for magnetic recording, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sliding block (rate 8/9) trellis code for magnetic recording will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1787939