Apparatus for selective retrieval of information streams or item

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record

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Details

360 721, 360 744, 369 25, 369 28, G11B 2728, G11B 1700, G11B 1500

Patent

active

043216358

ABSTRACT:
A video disc player for use with a record disc having recorded along a spiral track thereon a succession of information streams to be reproduced and a series of addresses identifying the successive turns of the track. Also recorded on the record disc, prior to the information streams, is an index listing at least the starting addresses of the information streams. An optical pickup assembly reads the record disc by traveling in its radial direction in step with the rotation of the disc. A memory stores the index read from the record disc and, upon actuation of one of information selector switches by the operator, delivers the starting address of the selected information stream to a comparator circuit. During the subsequent process of access to the selected information stream, perhaps with the pickup assembly fed at high speed toward same, the comparator circuit receives another input representing that address on the record disc which corresponds to the position of the pickup assembly relative to the disc. Upon agreement of the two inputs the comparator circuit produces an output for stopping the radial motion of the pickup assembly or for switching its radial motion from high to normal speed. The invention is further applicable to a tape cassette player, as also disclosed herein, and to other comparable devices.

REFERENCES:
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patent: 3530258 (1970-09-01), Gregg et al.
patent: 3573360 (1971-04-01), Rose, Jr.
patent: 3660616 (1972-05-01), Davidge et al.
patent: 3804993 (1974-04-01), Honnold et al.
patent: 3809302 (1974-05-01), Malyon
patent: 3931457 (1976-01-01), Mes
patent: 4000518 (1976-12-01), Stearns
patent: 4135058 (1979-01-01), Pfost et al.
patent: 4237497 (1980-12-01), Trevithick

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