Optical information recording or reproducing apparatus with asym

Details Optical information recording or reproducing apparatus with asym Optical information recording or reproducing apparatus with asym

1993-10-28

1995-11-21

Young, W. R.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 54, 369 59, 369124, G11B 700

Patent

active

054694159

ABSTRACT:
In an optical information recording or reproducing apparatus, an asymmetry detection circuit detects asymmetry values from digital RF signals reproduced from the reference area of an optical disk according to a timing signal generated by a timing signal generator. The digital RF signals are demodulated by the viterbi algorithm by a viterbi detection circuit on the basis of asymmetry values detected by an asymmetry detection circuit.

REFERENCES:
patent: 4688205 (1987-08-01), Abiko
patent: 5155714 (1992-10-01), Inoue
patent: 5243605 (1993-09-01), Lekmine et al.
Roger Wood, Steve Ahlgrim, Kurt Hallarnasek, and Roger Stenerson, "An Experimental Eight-Inch Disc Drive with One-Hundred Megabytes Per Surface," Ampex Corporation, Redwood City, Calif., IEEE Transactions on Magnetics, vol. mag-20, No. 5, Sep. 1984.

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