Code sequence generation method, modulation apparatus,...

Details Code sequence generation method, modulation apparatus,... Code sequence generation method, modulation apparatus,...

2006-11-29

2011-11-15

Jeanglaude, Jean (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

C341S050000, C341S051000, C341S058000, C714S752000, C714S792000

Reexamination Certificate

active

08059017

ABSTRACT:
A modulation apparatus includes: a modulation section that modulates, in accordance with a correlation table where a data sequence with a predetermined number of bits is associated with a code sequence with a predetermined number of bits, the data sequence into the code sequence to allow a predetermined demodulation section to demodulate the code sequence into the data sequence in accordance with the correlation table, wherein the code sequence is, on NRZI method, a MSN code sequence where a null point of a frequency spectrum on a recording channel or communication channel of the code sequence is matched with a null point of a frequency spectrum of a PR equalized signal including the code sequence and a minimum run length is limited to be greater or equal to one.

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L. Fredrickson, “Improved Trellis-Coding for Partial-Response Channels”, IEEE Transactions on Magnetics, vol. No. 2, Mar. 1995.
L.Fredrickson,“ImprovedTrellis-Coding for Partial-Response Channels”, IEEE Transactions Onmagnetics, vol. 31,No. 2,Mar. 1995.

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