Sector mark detection in long burn pattern for optical data disk

Details Sector mark detection in long burn pattern for optical data disk Sector mark detection in long burn pattern for optical data disk

1991-12-24

1993-08-17

Sniezek, Andrew L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 48, 369 59, 360 49, G11B 700

Patent

active

052375528

ABSTRACT:
The sector mark SM within a long burn data pattern recorded in each sector of an optical disk is detected asynchronously using a robust pattern detection algorithm. The terminal portion of the data pattern at the VFO field of the ANSI X3B11/ISO CCS Standard is ignored. The corner bits at the ends of the remaining pattern and between strings of one and zero bits are ignored, and the pattern that remains is stored in a register. A decoder compares adjacent strings of one and zero bits stored in the register to corresponding predetermined data. Voting circuitry uses a threshold value programmed by the user to determine the presence of a sector mark in the data pattern.

REFERENCES:
patent: 4646281 (1987-02-01), Verboom
patent: 4746997 (1988-05-01), Shrinkle et al.
patent: 4774700 (1988-09-01), Satoh et al.
patent: 4949200 (1990-08-01), Weng

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