后来，FCC感觉到电视节目占用了太多的广播频谱。
Later, the FCC decided that TV was taking up too much broadcast spectrum.
结果，电视广播公司现在仅需数字转换前所攫取频谱的一半。
As a consequence, television broadcasters now need little more than half the spectrum they hogged before switching to digital.
一定频谱范围内的无线电波只能搭载有限的广播频道；同轴电缆只能传 输有限的电视频道。
The radio spectrum can carry only so many stations, and a coaxial cable so many TV channels.
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