Detection apparatus for detecting sector marks of optical disk a

Details Detection apparatus for detecting sector marks of optical disk a Detection apparatus for detecting sector marks of optical disk a

1995-03-13

1995-12-19

Epps, Georgia Y.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 47, 369 58, 369 4426, G11B 700

Patent

active

054775124

ABSTRACT:
A sector mark detection apparatus detects a sector mark added to an arbitrary sector of an optical disk when seeking the arbitrary sector, where the optical disk has a predetermined recording format in which a predetermined number of sectors are arranged on the optical disk. The sector mark detection apparatus is provided with a gate signal generating circuit for generating a predetermined number of gate signals at predetermined intervals based on timings between pulse signals which are read from the optical disk, a mark length generating circuit for generating mark length data related to lengths of the sector marks from the read pulse signals based on the timings, a counter circuit for measuring widths of the gate signals by counting at a predetermined frequency and for outputting counted values, a matching circuit for comparing the counted values and match data and for outputting a matched result, and a judging circuit for judging the sector mark of the arbitrary sector based on the mark length data and the matching result.

REFERENCES:
patent: 5128916 (1992-07-01), Ito et al.
patent: 5206847 (1993-04-01), Kanda
patent: 5210733 (1993-05-01), Yamaguchi et al.
patent: 5235576 (1993-08-01), Shigemoni
patent: 5297131 (1994-03-01), Tanaka
patent: 5315568 (1994-05-01), Dente et al.

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