Magneto-optical disk reproducing apparatus with gain and offset

Details Magneto-optical disk reproducing apparatus with gain and offset Magneto-optical disk reproducing apparatus with gain and offset

1995-10-20

1996-12-24

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 48, 369 54, G11B 509

Patent

active

055879756

ABSTRACT:
Data that is recorded in a track on a magneto-optical disk and which contains a reference pattern that exhibits distinct amplitude levels is read from that disk by an optical head and then gain controlled and offset controlled before being detected. Gain and offset control values are calculated from the upper and lower amplitude levels in the reference pattern read from the disk, and are fed back to gain and offset control circuits. As a result, data that is read by the optical head is reproduced with proper gain and offset.

REFERENCES:
patent: 4509155 (1985-04-01), Masuda et al.
patent: 4611317 (1986-09-01), Takeuchi et al.
patent: 5001693 (1991-03-01), Kakuta
patent: 5361247 (1994-11-01), Fuji et al.
patent: 5463603 (1995-10-01), Petersen

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