Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1997-04-25
1998-09-08
Edun, Muhammad N.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
369 47, 369 48, 369 58, 360 48, G11B 700
Patent
active
058055517
ABSTRACT:
A recording and reproducing system for performing the reproduction using an optical recording medium. A physical feature of a ROM type disk is extracted and enciphered before being recorded in an optical disk. The cipher reproduced and converted into a plain text physical feature, which in turn, is compared with the physical feature information detected from the ROM disk. When both are coincident with each other, the operation of the system stops, thereby preventing the use of an illegally duplicated disk. The physical feature information, recorded on a magnetic recording layer 4 of the optical recording medium 2, is reproduced by an optical head 8 and compared with the information measured by a physical feature information detector, thereby detecting a duplicated medium.
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Gotoh Yoshiho
Oshima Mitsuaki
Edun Muhammad N.
Matsushita Electric - Industrial Co., Ltd.
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