调频广播
调频广播（英语：Frequency Modulation Broadcast），缩写FM广播，是一种利用频率调制技术来传送高保真声音个无线电广播技术，勒拉1933年由埃德温·霍华德·阿姆斯特朗（Edwin Howard Armstrong）发明。调频广播音质明显比调幅广播好，必过覆盖范围相对来讲蛮小个。
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