Direction-determination logic as for a signal pickup in recorded

Details Direction-determination logic as for a signal pickup in recorded Direction-determination logic as for a signal pickup in recorded

1992-04-21

1994-07-05

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, G11B 700

Patent

active

053274105

ABSTRACT:
Direction determining logic for a regulation circuit which guides a detection device along the data tracks of a recording medium receives an HF signal indicating when the detection device scans a dirty or damaged area of the recording medium, and a tracking error signal when the detection device leaves the track. The direction determining logic includes first and second multiple input terminal logic gates for respectively providing first and second complimentary output signals. A bistate logic circuit is selectively responsive to the HF signal and the tracking error signal and provides complementary output signals to one input terminal of each of the multiple input terminal logic gates. Other logic selectively inhibits the other input terminal of one of the multiple input terminal logic gates as the detection device scans a dirty or damaged area of the recording medium and the other of the multiple input terminal logic gates when the tracking device leaves the track.

REFERENCES:
patent: 5077718 (1991-12-01), Matsushita
patent: 5177719 (1993-01-01), Yamada et al.

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