Spread spectrum communication has been used since the 1940's. It was originally used by the military, but it is now being used for commercial applications as well. Spread spectrum communication systems are used to avoid interception of, and minimize interference with, transmitted messages. This is accomplished by periodically changing the frequency at which the information is broadcast. The pattern of frequencies used is controlled by a pseudorandom code. 

The system uses a modular computer to generate the signal to be transmitted. A program, written in C code in the PC, is used to demodulate the signal and extract the information.  
 

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