AUTOMATIC SECURE TRANSMISSION AND RECEPTION OF PICTORIAL INFORMATION

Abstract

A real time coding system for the transmission and reception of pictorial two-dimensional information at television (TV) rates. In one coding system, the input signal and a coding signal are modulo added in an operational amplifier and are transmitted therefrom as a coded signal, which may be a coded video signal. In the receiver, an operational amplifier receives the coded video signal along with an exact replica of the coding signal. The coding signal is subtracted from the coded video signal wherein the resulting original input signal is produced and fed to a TV type display, such as a CRT or electroluminescent flat panel. In a second coding system, a coding pattern is comprised of a transparent matrix structure which is substituted for a time varying signal. A flying spot scanner receives a voltage input signal from an operational amplifier and is controlled by a selected code for selectively scanning the transparent coding pattern matrix. The coded input light signals derived from the coding pattern matrix are applied to a photomultiplier wherein the output therefrom is transmitted to a receiver as a coded signal. The receiver decodes the coded signal by passing through an operational amplifier to a flying spot scanner which has a decoding pattern matrix associated therewith for selectively scanning the decoding pattern matrix according to the same selected code controlled scan pattern. The decoded light signal from the flying spot scanner is applied to a photomultiplier and the output therefrom is fed to a TV type display.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1JENNY BRAMLEY