Using Fourier series, the frequency spectrum analysis was analyzed, and spectrum data of harmony wave less than 19 were calculated.
利用傅里叶级数对其进行了频谱分析，计算了次数小于19次的各次谐波电流均方根值的频谱数据。
2
We also use short time Fourier transforms to analyze the spectrum of the scattered wave during the propagation process, and obtain some useful results.
并用短时傅立叶变换分析了声波传播过程中晶粒散射波的频谱特性。 获得了一些有用结果。
3
The Fourier spectrum of the wave moment shows that high frequency components will appear and they may cause ringing.