System and apparatus for recovering information from a record cu

Details System and apparatus for recovering information from a record cu System and apparatus for recovering information from a record cu

1995-02-15

1998-04-07

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4426, 369 48, 369 54, G11B 7095

Patent

active

057372861

ABSTRACT:
An information system including a record carrier and a playback apparatus. Information has been recorded on the record carrier in the form of variations of a first physical parameter. The playback apparatus scans the record carrier by means of a transducer which is responsive to the variations of the first physical parameter. An information recovering circuit recovers the information from a detection signal received from the transducer. The record carrier also exhibits second variations of a second physical parameter, which differs from the first physical parameter, but which second variations are of a type that are detectable by the transducer. A detection circuit detects the presence of the second variations or a predetermined property thereof (e.g., that they exhibit a predetermined variation pattern) on the basis of the detection signal received from the transducer. A circuit responsive to the detection circuit enables the information recovering circuit, when the presence of the second variations or a predetermined property of the second variations is detected, causing it to recover the information.

REFERENCES:
patent: 4849836 (1989-07-01), Kachikian
patent: 4879704 (1989-11-01), Takagi et al.
patent: 4907216 (1990-03-01), Rijnsburger
patent: 4975898 (1990-12-01), Yoshida
patent: 5060219 (1991-10-01), Lokhoff et al.
Patent Abstracts of Japan, vol. 10, No. 312, (P-509), (2368), Oct. 23, 1986, & JP 61-123026.

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