Rate 24/25 (0,9) code method and system for PRML recording chann

Details Rate 24/25 (0,9) code method and system for PRML recording chann Rate 24/25 (0,9) code method and system for PRML recording chann

1998-12-04

2000-10-10

Phan, Trong Q.

Coded data generation or conversion

Digital code to digital code converters

341 59, H03M 700

Patent

active

061306290

ABSTRACT:
A system and method employing a rate 24/25 (0,9) code constructed in accordance with a data byte interleaved with a rate 16/17 (0,5) codeword formed from two data bytes limits the number of consecutive zeros seen by a channel to nine. The 16/17 (0,5) codeword is formed from the two data bytes in accordance with a set of pivot bits and a set of corrections for predefined code violations. The additional data byte is interleaved into the 16/17 (0,5) codeword by splitting the byte into a pair of portions and inserting the portions into the 16/17 (0,5) codeword at locations adjacent to predefined ones of the pivot bits. The rate 24/25 (0,9) code is suitable for magnetic or similar recording media and may be employed in partial response maximum likelihood read channels. A feature of the constructed code is a high transition density which allows for more frequent timing and gain control updates, which results in lower required channel input signal to noise ratio for a given channel performance.

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patent: 6018304 (2000-01-01), Bessios

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