Coded data generation or conversion – Digital code to digital code converters – To or from minimum d.c. level codes
Patent
1998-06-29
2000-09-19
Williams, Howard L.
Coded data generation or conversion
Digital code to digital code converters
To or from minimum d.c. level codes
341 69, H03M 700
Patent
active
061219029
ABSTRACT:
A predetermined signal pattern whose length is 9 T or more (signal level="1") of a modulation signal S2 modulated by a modulating circuit corresponding to a conventional information signal is varied corresponding to an output signal SC1 of a disc identification code generating circuit. When the signal level of the output signal SC1 is "1", a signal converting circuit varies the signal level at a nearly center position of the particular signal pattern to "0" for 1 T. Thus, a pit whose length is 9 T or more is converted into two pits and one blank and recorded on a compact disc. When a reproducing operation is performed, a nearly center position of a reproduction signal of a pit whose length is 9 T or more is sampled. Corresponding to the sampled result, the disc identification code signal is decoded. Since a binary signal of the reproduction signal is not affected by the conversion, a conventional information signal is correctly reproduced.
REFERENCES:
patent: 5003527 (1991-03-01), Matsumoto et al.
patent: 5177720 (1993-01-01), Kondo
patent: 5638064 (1997-06-01), Mori et al.
patent: 5898394 (1999-04-01), Kobayashi et al.
Frommer William S.
Sony Corporation
Williams Howard L.
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