Method and apparatus of converting a series of data words...

Details Method and apparatus of converting a series of data words... Method and apparatus of converting a series of data words...

2006-02-07

2006-02-07

Young, Brian (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from nrz codes

Reexamination Certificate

active

06995698

ABSTRACT:
The present invention relates to method and apparatus of modulating a series of data words into (d,k) constrained sequence in order to record onto a recording medium. The present method generates, for each data word, a number of alternative sequences by combining mutually different digital words with the data word, calculates for each alternative sequence a digital sum value (DSV) and a penalty based on respective consecutive-zeros sections within the sequence and a joining consecutive “zeros” to a previously-selected sequence, and selects one alternative sequence for recording onto a recordable medium based on the calculated DSV and penalties. Owing to the present invention, DC component of sequences to be recorded onto a recording medium is suppressed and stabilization of a reproduction clock is improved through writing more edge information (i.e., “1”s).

REFERENCES:
patent: 5506581 (1996-04-01), Ino
patent: 6055273 (2000-04-01), Isomura
patent: 6744439 (2004-06-01), Laury et al.
patent: 401181214 (1989-07-01), None

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