若采样长度与回转速度不吻合，将会出现伪周期，使主值函数项中提取周期成分后的信号失实。

If sampling length doesn't adapt rotative velocity, the results of calculation by FFT or periodogram analysis will lead to pseudo-periods, which distorts the principal value function terms.

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而传统的延拓方法在前后两个边界处都会产生伪边缘，并且在延拓时还需考虑滤波器系数长度的奇偶性。

But traditional border processing methods will cause false edges, and also should consider the parity of filter coefficient.

youdao

而传统的延拓方法在前后两个边界处都会产生伪边缘，并且在延拓时还需考虑滤波器系数长度的奇偶性。

But traditional border processing methods will cause false edges, and also should consider the parity of filter coefficient.

youdao