中文说明：
信号的叠加、信号叠加后不超标时间的计算、fourier级数拟合。
English Description：
The superposition of signals, the calculation of the time after signal superposition does not exceed the standard, and the fitting of Fourier series
Superposition of signals, calculation of the time after signal superposition does not exceed the sta
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中文说明：
信号的叠加、信号叠加后不超标时间的计算、fourier级数拟合。
English Description：
The superposition of signals, the calculation of the time after signal superposition does not exceed the standard, and the fitting of Fourier series