Signal detector for an optical information reproducing apparatus

Details Signal detector for an optical information reproducing apparatus Signal detector for an optical information reproducing apparatus

1994-09-01

1997-01-28

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, 369124, G11B 700

Patent

active

055983898

ABSTRACT:
Write data, which has been modulated in a 4/11 mode and converted in an NRZI mode, is written on a sample servo type optical disk by means of a magnetic head and a laser diode in a pickup. A signal reproducer in an optical disk unit comprises a differentiating circuit for differentiating a reproduced signal originating from data recorded on the optical disk after detected by the pickup, an A/D converter for sampling a differential signal synchronously with a channel clock, and a difference detector for reproducing data by performing difference detection on results of A/D conversion. The difference detector includes a register, a selector, and a determiner.

REFERENCES:
patent: 5233589 (1993-08-01), Saito et al.
patent: 5377178 (1994-12-01), Saito et al.
"Jitter Characteristics of Mark Edge Recording on MO Disks", Journal of the Japanese Society of Applied Magnetism, vol. 16, No. 5, 1992, pp. 694-699.

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