Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1993-03-01
1996-07-23
Neyzari, Ali
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4426, G11B 1722
Patent
active
055397107
ABSTRACT:
A video optical disk system which can record/reproduce information in the same recording format as that of a read only type optical disk such as an LD, and is therefore compatible with both the read only type optical disk and a writable optical disk. A writable optical disk exhibiting a C/N ratio of at least 60 [dB] is employed, and has information recorded thereon with the same address signals as those of the LD and in the NTSC direct FM recording format. An optical head and an image processing circuit which are included in a player unit are made common to the recorded disk and the LD, and characteristics of a focusing/tracking control circuit, an RF signal preamplifier circuit and a tilt control circuit which are included in the player unit are changed over on the basis of reflectances of both types of optical disks, thereby enabling both the recorded disk and the LD to be reproduced. The users of the optical disk system can produce original video software by themselves, and can effectively utilize a software stock of read only type optical disks.
REFERENCES:
patent: 4803677 (1989-02-01), Yamaguchi et al.
patent: 5103436 (1992-04-01), Yajika et al.
patent: 5153861 (1992-10-01), Maeda et al.
Video Disk and Digital Audio Disk for Beginners, S. Iwamura et al., Corona Publishing Co., LTD, 1982, pp. 122-142.
Video &, H. Takahashi, Jul. 1990 pp. 73-78.
Kodera Yoshie
Konishi Katsuo
Kurebayashi Masaaki
Moritani Kouichi
Noro Yoshihiko
Hitachi , Ltd.
Neyzari Ali
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