Optical record carrier inscribed with read-out control data and

Details Optical record carrier inscribed with read-out control data and Optical record carrier inscribed with read-out control data and

1988-06-15

1990-06-12

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

049339230

ABSTRACT:
An optical record carrier having an information recording track which is inscribed with control data indicative of the change in average level of read-out signals from recorded and unrecorded portions of the track. Read apparatus for such record carrier scans the track with a radiation beam and derives a read-out electrical signal therefrom. The apparatus includes a signal-processing circuit which is adjusted for operation at the average level of signals derived from recorded portions of the track, such average level being determined by a programmable control unit from the recorded control data and the measured average level of signals from unrecorded portions of the track. Tracking of the scanning beam is also controlled in conformity with the difference in average signal strength from recorded and unrecorded portions of the track.

REFERENCES:
patent: 4688203 (1987-08-01), Koishi et al.
patent: 4796250 (1989-01-01), Kobayashi et al.

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