Modulation apparatus and method

Details Modulation apparatus and method Modulation apparatus and method

2007-08-14

2007-08-14

Nguyen, Khai M. (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

C341S058000, C341S068000, C375S253000

Reexamination Certificate

active

10469691

ABSTRACT:
The present invention pertains to a modulation apparatus and method in which the modulation apparatus is realized with a simple circuit structure and is easily applicable to other systems. A pattern conversion unit32converts data having a basic data length of 2 bits supplied from a DSV control bit determination and insertion unit31into a variable-length code having a basic code length of 3 bits in accordance with a conversion table. A minimum-run-length limitation code detection unit33detects, from a data sequence containing a DSV control bit, the position of minimum runs consecutive from a channel bit string converted by the pattern conversion unit32. A consecutive-minimum-run replacement unit34replaces a predetermined portion of the channel bit string supplied from the pattern conversion unit32for a predetermined pattern based on the position information supplied from the minimum-run-length limitation code detection unit33, and limits the minimum run length to a predetermined number or less. The present invention is applicable to a modulation apparatus.

REFERENCES:
patent: 5506581 (1996-04-01), Ino et al.
patent: 6172622 (2001-01-01), Nakagawa et al.
patent: 6496541 (2002-12-01), Kahlman et al.
patent: 6577255 (2003-06-01), Hayami et al.
patent: 2000-11551 (2000-01-01), None
patent: 2000-149457 (2000-05-01), None
patent: 2003-60511 (2003-02-01), None

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