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.
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.
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。
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