Coded data generation or conversion – Digital code to digital code converters – To or from 'n' out of 'm' codes
Reexamination Certificate
2005-06-21
2005-06-21
Tokar, Michael (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from 'n' out of 'm' codes
C341S058000, C341S103000
Reexamination Certificate
active
06909385
ABSTRACT:
A method of encoding digital information in order to suppress dc includes the steps of receiving a sequence of m message bits of a message word, and mapping the sequence of m message bits of the message word to a codeword, of length n bits, generated from the m message bits using algebraic operations. Multiple codeword candidates are generated from the m message bits using the algebraic operations to combine the m message bits with different periodic scrambling sequences. One of the codeword candidates is selected for mapping based upon an optimizing criteria. Second order digital sum sequences, corresponding to each of the plurality of codeword candidates, can be used as the optimizing criteria to select the codeword.
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Kurtas Erozan M.
Vasic Bane
Mai Lam T.
Seagate Technology LLC
Westman Champlin & Kelly P.A.
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