Coded data generation or conversion – Digital code to digital code converters – To or from minimum d.c. level codes
Reexamination Certificate
2006-11-28
2006-11-28
Williams, Howard L. (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from minimum d.c. level codes
C341S081000
Reexamination Certificate
active
07142134
ABSTRACT:
Techniques are provided for performing substitutions of bit sequences that are known to cause errors. Input data is initially modulation encoded. The modulated data is then analyzed in a sliding window to determine if it contains any additional bit sequences that are known to cause errors. If an error prone bit sequence is identified in the data, a substitution engine replaces the error prone bit sequence with a predetermined pattern of bits that is less likely to cause errors. The bit stream output of the substitution engine is then recorded on a storage medium. The recorded bit stream is decoded when it read from the medium. The decoding process identifies the substituted bit pattern and replaces the substituted pattern with the original sequence of bits.
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Blaum Mario
Lakovic Ksenija
Wilson Bruce A.
Hitachi Global Storage Technologies - Netherlands B.V.
Williams Howard L.
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