Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1991-08-02
1993-03-30
Psitos, Aristotelis
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 4434, 369 4427, G11B 700
Patent
active
051990113
ABSTRACT:
An apparatus for attenuating optical crosstalk induced components of a focus error signal in an optical disk drive of the type having a grooved optical disk with servo tracks and tracking and focus servo systems controlled by a digital signal processor. A calibration operation is performed whenever a new disk is inserted into the track. During the calibration operation, the disk is scanned about a tracking axis at a track crossing frequency greater than the focus servo system bandwidth. The focus error signals produced when the disk is scanned are filtered about a pass band including the track crossing frequency. Crosstalk values equal to values of the filtered focus error signals are determined as a function of corresponding values of the tracking error signals, and are stored in memory. A correction operation is performed while reading and writing data on the disk. During the correction operation, the crosstalk values are read from memory as a function of corresponding values of the tracking error signals, and summed with the focus error signals.
REFERENCES:
patent: 4707648 (1987-11-01), Minami
patent: 4730294 (1988-03-01), Funada
patent: 4747089 (1988-05-01), Eguchi et al.
Hofer Gregory V.
McDonald James C.
Cochran II William W.
Hewlett--Packard Company
Huber P. W.
Psitos Aristotelis
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