Apparatus for reading an optically coded disc-shaped record carr

Details Apparatus for reading an optically coded disc-shaped record carr Apparatus for reading an optically coded disc-shaped record carr

1983-04-28

1985-08-20

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 60, 369111, G11B 700

Patent

active

045368643

ABSTRACT:
The invention relates to an apparatus for reading a disc-shaped record carrier with a spiral information track in which an optically readable digitally coded information signal is recorded with a spatial bit frequency which is independent of the radius of the track turn. The scanning speed of the information track is selected to be a factor n higher than the scanning speed normally employed of the reproduction for the recorded information. By means of a memory device, information blocks being read and comprising a fixed number of data bits are time-expanded to restore the customary time relationship. A control unit determines the read-in cycles of the memory device for the storage of the information blocks being read and, via the radial positioning system for the read spot, it determines the scanning pattern of the record carrier so that the ultimately recorded information blocks are reproduced in the same sequence and at the desired rate.

REFERENCES:
patent: 3855424 (1974-12-01), Tharmaratnam et al.
patent: 4355338 (1982-10-01), Yamamoto et al.
patent: 4403259 (1983-09-01), Masaki
patent: 4410917 (1983-10-01), Newdoll et al.
patent: 4463389 (1984-07-01), Golding
Lee, "Time Compression and Expansion of Speech by the Sampling Method", Journal of the Audio Eng. Society, Nov. 1972, vol. 20, No. 9, pp. 738-742.
"Optical Video Disc May Meet Future Needs for High Volume Data Storage", Computer Design (USA), vol. 18, No. 2, Feb. 1979, pp. 39-40.

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