Spread spectrum technology
Conceived of by Hedy Lamarr and George Antheil in 1940 as a method of securing military communications from jamming and for eavesdropping during WWII, spread spectrum defines methods for wireless devices to use to send a number of narrowband frequencies over a range of frequencies simultaneously for communication. The narrowband frequencies used between devices change according to a random-appearing but defined pattern, allowing individual frequencies to contain parts of the transmission. Someone listening to a transmission using spread spectrum would hear only noise, unless their device understood in advance what frequencies were used for the transmission and could synchronize with them.
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