Erase mark detecting circuit for detecting an erase mark superim

Details Erase mark detecting circuit for detecting an erase mark superim Erase mark detecting circuit for detecting an erase mark superim

1991-03-27

1993-01-19

Chin, Tommy P.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369116, G11B 509, G11B 1552, G11B 2012, G11B 2722

Patent

active

051811960

ABSTRACT:
An erase mark detecting circuit and an optical information recording/reproducing apparatus in which the erase mark detecting circuit is applied in a suitable manner, in which an erase mark is superimposed on a predetermined portion of an information unit, such as information track and information sector, the erase mark is detected in accordance with a mean level of a data reproducing signal of the erase mark superimposed region and an existence of information data recorded on said predetermined portion. Therefore, according to the invention, the erase mark can be detected in a correct and stable manner without being influenced by the content of the information data recorded on the information unit or the recording method of the information data.

REFERENCES:
patent: 4308612 (1981-12-01), Miyauchi et al.
patent: 4606016 (1986-08-01), Verboom et al.
patent: 4663752 (1987-05-01), Kakuse et al.
patent: 4831611 (1989-05-01), Sasaki et al.
patent: 4932014 (1990-06-01), Tamiya

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