Rate-7/8 direct-current free and runlength limited code

Details Rate-7/8 direct-current free and runlength limited code Rate-7/8 direct-current free and runlength limited code

2008-09-16

2008-09-16

Young, Brian (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

C341S058000

Reexamination Certificate

active

11649486

ABSTRACT:
A run-length limited (RLL) DC-free encoder includes a determination module that receives input words and that determines whether each input word is a member of one of a first input set and a second input set, a first mapping module that maps the first ones of the input words of the first input set to corresponding output words that are run-length limited and DC-free, a second mapping module that maps the second ones of the input words of the second input set to corresponding output words that are run-length limited and have a negative digital sum, and an inverter module that selectively inverts the output words from the second mapping module based on a cumulative digital sum of the output words.

REFERENCES:
patent: 6337909 (2002-01-01), Vanstone et al.
patent: 6425107 (2002-07-01), Caldara et al.
patent: 6480125 (2002-11-01), Rub et al.
patent: 7149955 (2006-12-01), Sutardja et al.
patent: 7218255 (2007-05-01), Feng et al.
K.A.S. Inmink Codes for Mars Data Storage Systems; pp. 221-223.
Widmer et al; A DC-Balanced, Partitioned-Block, 8B/10B Transmission Code; BIM J. Res. Develop. vol. 27, No. 5, Sep. 1983; pp. 440-451.

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