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

1993-11-10

1995-07-11

Young, W. R.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 48, 369 50, 369 58, 369124, G11B 7085

Patent

active

054327628

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: 5206847 (1993-04-01), Kanda
patent: 5210733 (1993-05-01), Yamaguchi et al.
patent: 5315568 (1994-05-01), Dente et al.
ECMA, 230MB 90mm Standard Section 15, Sector Format, May 1993.

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