Signal processing circuit for magnetooptical record/reproducing

Details Signal processing circuit for magnetooptical record/reproducing Signal processing circuit for magnetooptical record/reproducing

1990-05-30

1992-09-15

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4437, 369121, G11B 700

Patent

active

051484161

ABSTRACT:
Optical recording/reproducing apparatus of the 2-head or 3-head type uses a simplified controller but is nevertheless capable of high-speed read-after-write check. In a 2-head embodiment a switching circuit supplies either a reproducing output of a recording head or a reproducing output of a reproducing head to a signal processing circuit selectively. When the reproducing output of the reproducing head is supplied, a signal generator supplies a signal to the signal processing circuit corresponding to the reproducing output of the recording head. In a 3-head embodiment a circuit compares identification signals in reproducing outputs of an erasing head and a recording head, respectively, and supplies the recording head with data to be recorded from a FIFO memory. A 3-head embodiment may also use a switching circuit for supplying either a reproducing output of an erasing head or a reproducing output of a reproducing head to a signal processing circuit.

REFERENCES:
patent: 4642703 (1987-02-01), Endo
patent: 4733385 (1988-03-01), Henmi et al.
patent: 4807204 (1989-02-01), Mizutani et al.
patent: 4845696 (1989-07-01), Ohtsuki et al.
patent: 4888750 (1989-12-01), Kryder et al.
patent: 4932014 (1990-06-01), Tamiya
patent: 4977550 (1990-12-01), Furuya et al.
patent: 4979158 (1990-12-01), Yoda

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