Abstract: A signal scrambling system is provided in which the scrambler includes a transition limiter which limits the size of changes in the amplitude of the input clear signal, a device for generating a pseudo random signal and combining the pseudo random and clear signals, and a transposer for reducing the bandwidth of the channel needed for the scrambled signal. The descrambler includes another pseudo random signal generator and device for combining the random signal with the received scrambled signal, as well as another transposer, for recovering a descrambled signal. The system minimizes the power bandwidth of the channel necessary to transmit accurately the scrambled signal which contains no vestiges, not even an average intensity, of the original input signal.

Abstract: The present invention is a "tethered remote" surveillance system that uses a command and control transmitter/receiver to activate selectively a number of audio and video sensors. The system generally comprises a plurality of remote sensors which are selectively controllable through a plurality of remote integral modules to which the sensors are connected. Each integral module is a physically compact unit which includes an antenna for transmitting the outputs of the plural sensors to a command and control station and an antenna for receiving encrypted command signals from the command station. The command station includes an encrypter for generating the command signals, an antenna for transmitting the signals to the integral modules and an antenna for receiving the signals transmitted by the integral modules, as well as devices for displaying and recording the signals received.