频率调制：载波的频率依照调校讯号的瞬时值而改变的一种调制。
Frequency modulation(FM): the form of modulation in which the frequency of the carrier is varied in accordance with the instantaneous value of the modulating signal.
调幅讯号之频谱为一半强度基频讯号之频谱分别正负位移一射频或载波之频率。
The spectrum of amplitude modulated signal are two half magnitude spectrums of base band signal positive and negative shifted by a carrier or R. F. frequency.
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