5.1 振幅调制的基本原理 三、讨论：调幅波的波形与频谱 包络的振幅： UmUcmma ma↑ 包络的振幅（Ucmma）↑ 调制程度越深 ma↓ 包络的振幅（Ucmma）↓ 调制程度越小调制系数ma的含义：表征载波的振幅受调制信号控制的强弱程度。
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能流密度不再随时间作简谐振荡，它的振幅构成一个高斯形状的包络。
The instantaneous energy density does not oscillate with time at the harmonic form, its amplitude forms and envelope with Gaussian shape.
因此，窄带脉冲光束可以采用复振幅包络和复解析信号两种表示式来研究，而对于宽带脉冲光束，必须采用严格的复解析信号表示式。
It is concluded that both of the representations are applicable to study narrowband pulse, but for broadband pulse only rigorous complex analytical signal representation should be adopted.
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