频率域滤波方法虽然可解决时变滤波问题，但这种方法是基于傅里叶变换，在窗口与窗口之间的接合部位会出现假异常。

Although the filtering method in frequency domain can solve the time variant filtering problem based on Fourier transform, the method may appear a false anomaly in conjunct part between Windows.

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时频分析方法是利用小波变换原理，从地震波的时间域和频率域同时对其作出分析。

Time frequency analysis method is used to analyze the time domain and frequency domain of seismic waves at the same time according to the principle of wavelet transformation.

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这三种频率域处理方法提取得到了合理的、一致的慢度结果。

These frequency domain processing methods yield reasonable and consistent slowness estimations.

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