Data readout system for optical disk having maximum likelihood d

Details Data readout system for optical disk having maximum likelihood d Data readout system for optical disk having maximum likelihood d

1994-09-22

1997-10-21

Young, W. R.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 59, G11B 700

Patent

active

056803800

ABSTRACT:
A system reproduces data from an optical disk in which a signal obtained by encoding recording data in accordance with a recording rule including a rule corresponding to a partial response class I characteristic has been recorded. The system includes an optical head for reproducing a signal from the optical disk, an analog-to-digital converter for sampling the signal reproduced by the optical head at predetermined timing and for outputting sampling data, a determination unit for determining, based on the sampling data from the analog-to-digital converter, a transition state of data to be reproduced in accordance with a transmission line characteristic of the reproduction system for the optical disk, and a data decision unit for deciding maximum likelihood reproduction data at present timing based on the determination result obtained by the determination unit.

REFERENCES:
patent: 5260917 (1993-11-01), Mashimo
patent: 5363352 (1994-11-01), Tobita et al.
patent: 5392270 (1995-02-01), Okada et al.
patent: 5420893 (1995-05-01), Ward
patent: 5450389 (1995-09-01), Hayashi
patent: 5469415 (1995-11-01), Fujita et al.
"Viterbi Detection of Partial Response on a Magneto-Optical Recording Channel" by Minoru Tobita, Tamotsu Yamagami and Tetsu Watanabe, Feb. 11, 1985, pp. 82-85.
"Optical Reception for Binary Partial Response Channels", by M.J. Ferguson, The Bell System Technical Journal, Feb. 1972, pp. 493-505.

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