Data detection in optical disk drives using decision...

Details Data detection in optical disk drives using decision... Data detection in optical disk drives using decision...

2005-01-25

2005-01-25

Huber, Paul W. (Department: 2653)

Dynamic information storage or retrieval

Binary pulse train information signal

Including sampling or a/d converting

C369S124110

Reexamination Certificate

active

06847602

ABSTRACT:
A method and apparatus in an optical disk system employing a decision feedback equalization (DFE) technique to provide a boosted signal resolution at a data slicer input while minimizing noise. In one embodiment, an optical equalizer includes a feed forward equalizer (FFE) that equalizes the signal from the optical disk and provides an equalized signal and a feedback equalizer (FBE) that generates a feedback signal. The feedback signal is subtracted from the equalized signal to provide a signal having increased resolution and low noise, which is then applied to a data slicer. In one embodiment, the boost provided by the FFE is lower than in conventional equalizers to minimize noise. As the boost of the FFE is reduced, the number of taps in the FBE is increased to provide optimized system performance.

REFERENCES:
patent: 5572503 (1996-11-01), Satoh et al.
patent: 6600779 (2003-07-01), Sawada et al.
John G. Kenney and Roger Wood; Multi-level Decision Feedback Equalization: An Efficient Realization of FDTS/DF; Mar. 1995, IEEE Transactions On Magnetics. vol. 31.; 6 pages.
Jan Bergmans, 6.6 Decision-Feedback Equalization for Run-Length-Limited Codes;Digital Baseband Transmission and Recording;Kluwer Academic Publishers, 1996; pp. 287-290.

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