更有效的一种方法是让电视直播通过运用分散的网络辐射装置发出讯号，覆盖所有可用的移动网络，从而尽可能大范围地向所有掌上设备散播无线信号。
A more efficient approach for live TV is to “multi-cast” a signal to all handsets using a separate radio network overlaid on the existing mobile network.
所以O'Brien先生一直研究一套基于天花板的系统，用于跟踪接收装置所在位置，利用来自定向传送器的几束激光向该装置发出信号。
So Mr O'Brien has been working on a ceiling-based system that tracks where a receiving device is, and then sends it a signal using several laser beams from a directional transmitter.
前置放大器电子线路或装置，用来探测并加强无线电接收机所发出的微弱信号，从而使其达到更加有力的增幅程度。
An electronic circuit or device that detects and strengthens weak signals, as from a radio receiver, for subsequent, more powerful amplification stages.
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