Cellphones send signals to nearby towers via radio frequency waves, a form of energy similar to FM radio waves and microwaves.

手机经过射频电波(一种与调频电波和微波类似的能量方式)，将信号发送至左近的信号塔。

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The filter used a kind of general structure, whose central frequency located nearby the rotation speed to reduce the unbalance vibration.

该陷波滤波器采用通用式结构，其中心频率分布在转子转速附近以抑制不平衡振动。

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Zero placement method in the frequency domain is utilized to design robust multi-hump EI optimal arbitrary time-delay filter (OATF) by placing two or more filter zeros nearby the system poles.

采用频域的零点配置方法，通过在系统极点附近配置多个滤波器零点设计强鲁棒性的多峰极不灵敏（E I）最优随机时滞滤波器。

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If there is still no response, a distress alert will be transmitted on the emergency frequency to the nearest coastguard and nearby shipping.

BBC: Alan Rankin on his yacht Trade Winds

It works by jamming all nearby transmissions at the operating frequency of the medical device, except for those signals that were authorized to use the device.

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