Coded data generation or conversion – Digital code to digital code converters – To or from run length limited codes
Reexamination Certificate
2006-04-18
2006-04-18
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from run length limited codes
C341S058000
Reexamination Certificate
active
07030788
ABSTRACT:
Output data of a multiplexer11is EFM-modulated by an EFM modulator12.In the EFM modulation, merging bits that satisfy run length limit conditions Tmin=3 and Tmax=11 are selected. Among them, merging bits that converge DSV are selected. A run length controlling portion13detects a particular data pattern that causes DSV to increase as large as a data read error takes place and controls the EFM modulator12so that the run length limit conditions of the EFM are loosened. As a result, an increase of DSV is suppressed. Data is reproduced from a data recording medium on which the data has been recorded in such a manner and the reproduced data is decoded. The decoded data is re-encoded so as to record it to another recoding medium. When the data pattern is re-encoded, DSV increases. As a result, data cannot be correctly reproduced from the other recording medium. Consequently, a copying operation can be prevented.
REFERENCES:
patent: 6118104 (2000-09-01), Berkcan et al.
patent: 2001/0004345 (2001-06-01), Tanoue et al.
patent: 2002/0159367 (2002-10-01), Ahn
patent: 2005/0086578 (2005-04-01), Saito et al.
patent: 2005/0117491 (2005-06-01), Sako et al.
patent: 63-26855 (1988-02-01), None
patent: 9-288864 (1997-11-01), None
patent: 2002-216435 (2002-08-01), None
Aida Toru
Senno Toshihiko
Jean-Pierre Peguy
Sony Disc & Digital Solutions Inc.
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