Apparatus for detecting presence of information data for use in

Details Apparatus for detecting presence of information data for use in Apparatus for detecting presence of information data for use in

1994-11-08

1997-04-22

Beausoliel, Jr., Robert W.

Excavating

G11C 2900

Patent

active

056235054

ABSTRACT:
An information data detecting apparatus for use in a recording medium playing apparatus detects the presence/absence of information data under software control using an error correction code. The information data detecting apparatus acquires a read signal representing the contents of a specified sector, extracts digital data from the read signal, performs an error-correcting operation on the extracted digital data and produces an error-correctable indicating flag when error correction is possible. When detecting the presence of the error-correctable indicating flag, the information data detecting apparatus produces a written-state signal indicating that the specified sector is used.

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patent: 4998252 (1991-03-01), Suzuki et al.
patent: 5299208 (1994-03-01), Blaum et al.

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