Ocean underwater channel is a stochastic acoustic propagation channel with its multipaths, time variety, and frequency spread.

海洋水声信道是多途、时变和频散的信道。

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The invention provides a device for reducing electromagnetic interference, comprising a receiving module, a first compare module and a frequency spread module.

本发明提供一种用于降低电磁干扰的装置，其中包含一接收模块、一第一比较模块以及一展频模块。

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If the first frequency is higher than the second frequency, the frequency spread module upwards spreads on the first frequency, and downwards spreads on the second frequency.

如果该第一频率高于该第二频率，则该展频模块将该第一频率向上展频，并将该第二频率向下展频。

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Lamarr termed the technique "frequency hopping, " a forerunner of the spread-spectrum technology that is used today in communications applications such as Wi-Fi.

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