Apparatus for selective retrieval of information streams or items

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