Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1998-02-10
2000-02-29
Edun, Muhammad
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 47, 369 50, 369 59, G11B 700
Patent
active
060317965
ABSTRACT:
An optical disk apparatus for performing recording and reproduction of information on an optical disk is disclosed. The optical disk has a sector format which consists of a sector mark area in which a sector mark is recorded and an address area in which a plurality of VFO segments and ID segments are alternately provided. The apparatus comprises a sector mark detector, a read gate controller, a PLL controller and an address information detector. The sector mark detector detects the sector mark. The read gate controller controls a read gate to be opened and closed. The read gate enables readout of information from the VFO segment when it is opened. The PLL controller initiates synchronization of a signal read from the VFO segment with a PLL in response to the opening of the read gate. The address information detector detects an address identifier recorded in the ID segment. If the address information detector cannot detect the address identifier, the read gate controller closes the read gate and opens the read gate at a timing corresponding to the VFO segment located immediately after the ID segment in which the address identifier cannot be detected.
REFERENCES:
patent: 5559765 (1996-09-01), Andou
patent: 5825736 (1998-10-01), Kimura et al.
patent: 5848040 (1998-12-01), Tanaka
Fukuda Misao
Mashimo Akira
Masuda Takayuki
Ueno Keishi
Edun Muhammad
NEC Corporation
Teac Corporation
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