Optical disk reproducing apparatus equipped with variable gain a

Details Optical disk reproducing apparatus equipped with variable gain a Optical disk reproducing apparatus equipped with variable gain a

1996-10-24

1998-07-21

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 48, G11B 700

Patent

active

057843562

ABSTRACT:
An apparatus for an optical disk reproducing apparatus is disclosed, which allows positive counter-measures against data read errors without depending on only an operation of decreasing the reproduction speed, thus positively maintaining high speed reproduction. This system incorporates an error rate counter for monitoring error flags which can be detected in error correction processing, and a variable gain amplifier for adjusting the amplitude of an RF signal. A system controller constantly monitors error count data to determine the error rate of a disk in the reproduction mode from moment to moment. When the error rate exceeds a certain level at each reproduction speed, the amplitude of an RF signal from the variable gain amplifier is increased to set the error rate to a level at which data can be properly read.

REFERENCES:
patent: 4300172 (1981-11-01), Sochor et al.
patent: 5083304 (1992-01-01), Cahill
patent: 5132988 (1992-07-01), Fisher et al.
patent: 5297184 (1994-03-01), Behrens et al.
patent: 5422601 (1995-06-01), Kovacs et al.
patent: 5568465 (1996-10-01), Hutchins et al.
Patent Abstracts of Japan, vol. 11, No. 40 (P-544), Feb. 5, 1987, JP-61-208634, Sep. 17, 1986.

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