Apparatus for reproducing recorded information with error detect

Details Apparatus for reproducing recorded information with error detect Apparatus for reproducing recorded information with error detect

1995-06-05

1997-03-18

Hindi, Nabil

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 54, 369 53, G11B 700

Patent

active

056129335

ABSTRACT:
An apparatus for reproducing recorded information reads information from the track surface of a CD-ROM disk 1, performs error detection and correction processing on the read information to reproduce recorded information and then outputs the reproduced information. This apparatus includes a control device 11, which switches a reproduction operation to the standard speed mode in response to a correction failure condition generated in the quadruple speed mode and retries standard-speed reading of the information read with an error uncorrectable in the quadruple speed mode. Reducing the signal read speed to one-fourth in the retry processing at the standard speed improves the C/N ratio of the high-frequency signal RF by 6 dB, which in turn improves the correction capability for random errors.

REFERENCES:
patent: 4752846 (1988-06-01), Proehl
patent: 4821125 (1989-04-01), Christensen et al.
patent: 5128946 (1992-07-01), Ogino et al.
patent: 5313443 (1994-05-01), Iitsuka
patent: 5349481 (1994-09-01), Kauffman et al.

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