Coded data generation or conversion – Digital code to digital code converters – To or from mixed base codes
Reexamination Certificate
2006-04-18
2006-04-18
Nguyen, John B (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from mixed base codes
C341S081000, C341S050000, C714S778000, C714S784000
Reexamination Certificate
active
07030789
ABSTRACT:
Techniques are provided for applying modulation constraints to data by using periodically changing symbol mappings to replace certain prohibited error prone data patterns. Initially, user data in a first base is mapped to integers of a second base using a base conversion technique. The integers in the second base correspond to symbols. Subsequently, periodically changing symbol mappings are performed during which prohibited symbols generated during base conversion are mapped to permitted symbols. The periodically changing symbol mappings occur in multiple phases, and the prohibited symbols are different in each phase. The resulting data is processed by a precoder in some embodiments.
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Cideciyan Roy D.
Eleftheriou Evangelos S.
Galbraith Richard Leo
Mittelholzer Thomas
Oenning Travis
Hitachi Global Storage Technologies - Netherlands B.V.
Nguyen John B
Townsend and Townsend / and Crew LLP
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