Coded data generation or conversion – Digital code to digital code converters – To or from run length limited codes
Reexamination Certificate
2006-05-02
2006-05-02
Wamsley, Patrick (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from run length limited codes
C705S057000
Reexamination Certificate
active
07038600
ABSTRACT:
A method and device for adding or extracting a secondary information signal to/from a runlength-limited code sequence, includes detecting a polarity of a runlength at a first predetermined position of the runlength-limited code sequence and setting a parameter reflecting the degree of freedom that is present in the runlength-limited channel code, e.g., the selection of a merging bit pattern in the CD-standard, on the basis of the detected polarity so as to obtain a predetermined polarity of a runlength at a subsequent second predetermined position of the runlength-limited code sequence. The predetermined polarity then corresponds to a binary value of the secondary information. Thus, a side-channel with a small capacity is provided, which is positioned very close to the physical channel such that the secondary information is hard to be detected from the EFM bit stream. Therefore, the side-channel can be used as a hidden channel for copy protection purposes.
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Coene Willem Marie Julia Marcel
Heemskerk Jacobus Petrus Josephus
Staring Antonius Adriaan Maria
Talstra Johan Cornelis
Goodman Edward W.
Koninklijke Philips Electronics , N.V.
Wamsley Patrick
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