Recording medium, data recording method and apparatus, data...

Details Recording medium, data recording method and apparatus, data... Recording medium, data recording method and apparatus, data...

2007-07-10

2007-07-10

Barron, Jr., Gilberto (Department: 2132)

Cryptography

Electric signal modification

Having magnetic record carrier

C380S269000, C380S042000

Reexamination Certificate

active

11128685

ABSTRACT:
Data is recorded in a first part PA1in accordance with a signal format same as that of an existing CD at the lower limit (1.5 μm) of an allowable value of a Wreck pitch and the lower limit (1.2 m/sec) of a linear velocity. As a result, the data for the maximum regeneration time (74.7 min) can be recorded in the first part PA1. An existing CD reproducing apparatus can reproduce the audio data recorded in the first part PA1with no problem. Moreover, compressed and encrypted audio data is recorded in a second part PA2at a single density or a double density. The single density represents a recording density same as that of an existing CD and the double density represents a density two time larger than the single density. Furthermore, the audio data recorded in the second part PA2is charged when reproduced in order to protect copyrights. The format of the data recorded in the second part PA2uses the format of a CD-ROM.

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