Telephone Communications
How does frequency hopping work?
Answered by
Planet Green
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Planet Green
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The mechanical switching system called frequency hopping was not very complicated. Hedy Lamarr and her arranger invented a way that control frequencies could be shifted by Americans fighting with torpedoes during World War II. It resembled how a player piano roll works and required synchronizing the transmitter and receiver. Pseudo-random number generators and clocks that keep good time help accomplish this goal. A spread spectrum system is used to quickly switch around from frequency to frequency. The trick is to use more than one frequency and to not have a pattern for which frequency will be used next.
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