Yes, signal from radios, cell phones, TV stations, remote controls, you name it.

是的，无线电信号，手机信号，电视台信号，遥控器信号，应有尽有。

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When a composite video signal is broadcast over the airwaves by a TV station, it happens on a specific frequency.

当电视台要把组合视频信号经由无线电波广播出去时，要先把它调制到特定频率的载波上。

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Earlier this year researchers at Intel and the University of Washington, in Seattle, showed that they could power a small sensor using a TV signal 4.1 kilometres away.

今年早些时候，英特尔及西雅图华盛顿大学的研究人员演示表明，他们能够从4.1公里以外的电视信号中获取能量来给一个小功率传感器供电。

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A signal from the TV tells each side of the glasses when to turn on and off, showing each eye slightly different images that create the sense of depth.

VOA: special.2010.01.26

Currently, Fox sends its signal to TV stations across the country, including 27 that it owns directly.

NPR: Exec Threatens To Pull Fox Signal If Aereo Goes On

Ours is on a rack too shallow and low to accommodate a laser printer, and placed out of the way to minimize interference with the signal from TV sets, cordless phones and microwave ovens.

FORBES: Magazine Article

Consumers have the right to receive a broadcast TV signal on any device they choose (originally just a TV) and by extension, record programs for their own personal use.

FORBES: By Putting Over-the-Air Online Legally, Aereo Clears The Way For ALL TV Everywhere