Note: It is necessary to have a default value for the variable, in order to preview the results of the filter operation.

注意：该变量需要有一个默认值，以便预览过滤操作的结果。

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Phase-matched filter is applied to extract phase of fundamental surface wave, and then time-variable filter is used to correct amplitude spectrum in order to isolate fundamental mode signs.

使用相匹配滤波技术提取基阶面波振型的相位，然后再利用时变滤波进行振幅谱校正，以此分离出基阶振型面波信号。

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