Data recording/reproducing apparatus with two-dimensional equali

Details Data recording/reproducing apparatus with two-dimensional equali Data recording/reproducing apparatus with two-dimensional equali

1989-12-21

1992-11-24

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4434, 369 48, 369 4426, 360 65, G11B 700

Patent

active

051669145

ABSTRACT:
An equalizer apparatus is applied to a DBF disk recording medium in which a sampling clock is reproduced from clock pits recorded on the disk recording medium. A fixed coefficient equalizer includes an analog to digital converter, a memory and a two-dimension equalizer. The fixed coefficient equalizer suppresses interference from adjacent tracks and reduces the error rate of the reproduced data caused by crosstalk even in the case of a narrow track pitch. Further, by adding to the equalizer a sign detector, a FIR low-pass filter and a coefficient control circuit to form a variable coefficient equalizer, interference fluctuation attributed to the linear recording density, recording power irregularity, light spot shape, tracking error, etc., can be automatically compensated to suppress the equalization error caused by such fluctuation. Further, using the variable coefficient equalizer, clocking timing errors and fluctuations can be automatically and efficiently compensated.

REFERENCES:
patent: 4064397 (1977-12-01), Sakaki et al.
patent: 4564869 (1986-01-01), Baumeister
patent: 4907100 (1990-03-01), Nishiyama et al.

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