Until now, the volume of a transmitted radio message overpowered the relatively weak incoming signal from the radio at the other end.
直到目前为止，一个无线电节点发送的无线电信息音量往往相对较强，总会盖过另一端无线电发送进来的相对较弱的信号。
Indeed, that is how a radio antenna works, except that the weak current generated by the radio waves has to be amplified to do its job of carrying a signal round a radio.
而收音机的天线就是这样工作的，只不过电波所产生的电流非常弱，需要进一步放大从而完成信号传输。
Imagine a radio that picks up any number of signal, many of which are weak and distorted.
想像一台收音机接收各种数字信号，这些信号中有的很弱，有的失真。
Imagine a radio that picks up any number of signal, many of which are weak and distorted.
想像一台收音机接收各种数字信号，这些信号中有的很弱，有的失真。
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