Coded data generation or conversion – Digital code to digital code converters – To or from run length limited codes
Reexamination Certificate
2002-12-18
2008-05-13
Mai, Lam T. (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from run length limited codes
C341S055000
Reexamination Certificate
active
07372376
ABSTRACT:
A method of converting m-bit information words to a run-length constrained modulated signal includes converting the information words into n-bit code words. The available code words are distributed over at least one group (G1) of a first type and at least one group (G2) of a second type. The selection of a code word belonging to the group of the first or second type establishes a coding state of the first type (S1) or one of a number r of coding states (S2, S3) of the second type, depending on the current information word. For each information word, a subset of code words is available, this subset having at least one disjunct code word for each of the r coding states. The selection from the subset of the code word to be delivered is based the coding state, on dynamically verifying the run-length constraint for the sequence of code words, and on an additional criterion, like the low frequency content of the modulated signal.
REFERENCES:
patent: 5790056 (1998-08-01), Schouhamer Immink
patent: 6225921 (2001-05-01), Kahlman et al.
patent: 6768432 (2004-07-01), Schouhamer Immink
patent: 7158060 (2007-01-01), Kahlman et al.
Koninklijke Philips Electronics , N.V.
Mai Lam T.
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