The variable polarity power supply can satisfy the welding process of the aluminum and aluminum alloy by adjusting the current frequency, positive and negative current time and amplitude value.

调节正负半波的幅值、频率及占空比能满足铝及铝合金的焊接工艺要求。

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This method does not use the time variable as reference but is based on the amplitude of the signal. It can get the multirate sampling for complex signals.

不以时间作为采样的基准，而以信号的幅度作为采样的基准，实现了对包含多种频率成分的复杂信号的多采样率。

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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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