Servo system for reading from a disc-shaped record carrier conta

Details Servo system for reading from a disc-shaped record carrier conta Servo system for reading from a disc-shaped record carrier conta

1976-12-10

1979-04-10

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003B, 1791003D, 1791003V, 360 10, 360 77, H04N 584, G11B 700

Patent

active

RE0299634

ABSTRACT:
Apparatus for reading a disc-shaped record carrier in which video and/or audio information is recorded in a preferably spiral track. This information is optically read by means of a beam of radiation which via a reflecting element transmits the information present in the scanned point of the record carrier to a read detector. The radial position of the scanning point is controlled by controlling the angular position of the reflecting element which for this purpose is included in a control loop. In order to reproduce the information at a speed different from the recording speed, for example to display slow-motion pictures or still pictures, the reflecting element may be subjected by means of a control signal to an abrupt change in angular position so that the scanning point undergoes an abrupt radial displacement. This displacement preferably takes place during the frame flyback periods of the video information.

REFERENCES:
patent: 3381086 (1968-04-01), De Moss et al.
patent: 3530258 (1970-09-01), Gregg et al.
patent: 3654624 (1972-04-01), Becker et al.
patent: 3737877 (1973-06-01), Feinlab
patent: 3767848 (1973-10-01), Schuller et al.
patent: 3908080 (1975-09-01), Broadbent
World Premier Video Disc, AEG-Telefunken & Teldec Publication, pp. 22-23, 6/70.

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