Coded data generation or conversion – Digital code to digital code converters – To or from minimum d.c. level codes
Reexamination Certificate
2011-04-19
2011-04-19
Lauture, Joseph (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from minimum d.c. level codes
C369S059240
Reexamination Certificate
active
07928865
ABSTRACT:
There are provided a method and apparatus for embedding a second level code into a first level code of an optical disc by data modulation rule variation. The apparatus includes a multi-level, varying rule based modulator (199) for modulating the first level code to obtain a channel bit stream representative of the first level code and having the second level code embedded therein. The multi-level, varying rule based modulator modulates the first level code using modulation rules respectively having different statistical properties of pit-land length distributions that preserve a readability of the first level code and that are distinguishable at readout of the optical disc. The different statistical properties represent binary or multilevel data of the second level code.
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International Search Report, dated Mar. 12, 2007.
Hamersley Alan Bruce
Hofmann Holger
Town John Matthew
Lauture Joseph
Levy Robert B.
Shedd Robert D.
Thomson Licensing
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