Optical recording medium, reproducing system, method of...

Details Optical recording medium, reproducing system, method of... Optical recording medium, reproducing system, method of...

2008-05-20

2008-05-20

Mulvaney, Elizabeth (Department: 1774)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064200, C428S064400, C428S913000, C369S275100, C369S284000

Reissue Patent

active

09664434

ABSTRACT:
The present invention provides an optical disk9with a duplication preventing function, reproducing system47for the optical disk9, optical disk reproducing method, method of fabricating an optical disk original record, and illegal program operation stopping method. An area in which a CP signal24is recorded is made after a signal having a constant pattern in the optical disk, the CP signal24being produced such that the center of an eye pattern is shifted from the center of the amplitude. In the reproducing system, CP signal arrangement information25or a CP preceding signal26is detected, before an offset voltage is applied to a threshold value to be used in demodulating an RF signal into a digital signal so that the threshold value varies, thus normally reproducing the signal in which center of the eye patter is shifted from the center of the amplitude. The reproducing system has a function whereby the reproduction is stopped when a predetermined offset signal is not reproduced.

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