Optical recording medium reproducing apparatus using edge detect

Details Optical recording medium reproducing apparatus using edge detect Optical recording medium reproducing apparatus using edge detect

1996-11-25

1998-03-10

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 59, G11B 700

Patent

active

057269661

ABSTRACT:
A demodulation device for use with an optical recording medium comprises an edge detector for detecting edges of a binary signal corresponding to marks written onto the optical recording medium as information, an edge interval measuring circuit for measuring a value for the interval between two successive edges detected by the edge detector, a storage device for storing a table that relates thresholds representing upper and lower limits on at least one of a length of the mark and an interval between the marks to demodulated bit strings, and a data converter for comparing an edge interval value obtained by the edge interval measuring circuit with the thresholds representing upper and lower limits to thereby determine one of corresponding a length of the mark and an interval between marks and obtain a demodulated bit string corresponding to the edge interval value measured from the table.

REFERENCES:
patent: 4652730 (1987-03-01), Marshall
patent: 4989196 (1991-01-01), Ishikawa et al.
patent: 5315569 (1994-05-01), Saito et al.
patent: 5418770 (1995-05-01), Ide et al.
patent: 5420849 (1995-05-01), Matsueda

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