This method not only can achieve the distortionless envelope detection of voltage flicker, but also can detect the time, frequency and amplitude of the signal accurately.

该方法不仅能够对电压闪变信号进行不失真地包络检波，而且能够精确地检测电压闪变信号的时间和包络信号的频率分量及其幅度。

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A time history is synthesized from this amplitude spectrum and a random phase spectrum, combined with an envelope function.

据此幅值谱和一个随机相位谱，并与一个时程包络函数结合，合成一个子震时程。

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A new technique for picking the first S-Wave arrival is presented by multiplying energy ratio of the long window to the short window by the square of the amplitude envelope of waveforms in the paper.

提出了利用波形长短时窗能量比值与波形信号能量包络的平方乘积检测横波初至的新方法。

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