f(t)=sin(100πt) f=400Hz的余弦信号。使用MATLAB实现调幅信号y(t)，并观察f(t)的频谱和y(t)的频谱，以及两者在频域上的关系。

地震信号的干扰去除张新贾伟亮\张新.doc
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地震信号的干扰去除张新贾伟亮

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