DRAHTLOSE UEBERTRAGUNG VOM FERNSEHGERAET ZUR FERNSEHSTATION.

摘要

The TV system includes a large number of receivers which are interrogated by a transmitted signal for response from simplified responders. At a transmission site circuitry is provided for transmission of a video signal providing coded signal queries constituting coded bits superimposed in selected horizontal line video positions and spaced in time slots permitting responses to be received from individual receiver responder units located in a given geographic area. At television set locations responder units are provided with circuitry receiving the video signal and responding to the coded bit queries in an answer constituting a single r-f burst located in a time slot designated on the horizontal line sweep uniquely identifying each particular responder unit' All units respond with a burst of the same frequency at different unique time slots following the query.