Optical disk, reproducing device and recording device therefor

Details Optical disk, reproducing device and recording device therefor Optical disk, reproducing device and recording device therefor

1997-08-22

1999-09-07

Edun, Muhammad

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 54, 3692754, G11B 700

Patent

active

059497491

ABSTRACT:
In an optical disk, a pit train having a spatial frequency component greater than a reproduction limit defined by the modulation transfer function of a reproducing optical pick-up is recorded at predetermined position and it is discriminated whether or not the optical disk is a copied duplicate by comparing a reproduced pit train with a prerecorded reference pattern.

REFERENCES:
patent: 5703858 (1997-12-01), Mitchell et al.
patent: 5809006 (1998-09-01), Davis et al.

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