Abstract: A depth perception television system is described. Light radiation from a three-dimensional scene is collected by a convergent lens and transmitted through a lenticulated grid onto the face of a light radiation sensing tube of a television camera. The lenticulated grid is made up of a multiplicity of vertically oriented lens elements, each of which has a generally cylindrical arc incident surface and a generally planar exit surface. Such lenticulated grid acts to separate light radiation received thereby into a plurality of image elements of each aspect of the scene and then focus the same at predetermined locations on the pick-up surface of the camera. An electrical signal representative of the locations on the face of the camera at which such image elements are focused is formed in a conventional manner by the camera and transmitted to a monitor which conventionally displays such image elements on a display screen, such as the face of a cathode ray tube.

Abstract: A theft communication system is particularly useful for indicating the unauthorized disconnection of a television set or the like from any one of the rooms of a hotel or motel. The communication system includes a central transmitter connected with a master television antenna system for transmitting successive querying scan pulses to sensors located on the antenna line at the location of each television set. Each of the sensors is adapted to apply a reply signal to the antenna line if its sensing circuitry indicates that its associated television set has been disconnected therefrom. The time of reply of each of the sensors is different from that of any other, and the system further includes a receiver connected to the antenna line at a central location for receipt of such reply signals.