中文说明： 局部放电试验所采集的信号中往往混有白噪声、周期干扰信号去除。此处采用常用db系列小波中的db6小波进行9尺度的多分辨分解后，根据白噪声能量特性，估算各尺度的阈值大小，采用硬值进行处理，后进行重构。
English Description：
Signal acquisition and the partial discharge test is often mixed with white noise, periodic interference signal removing. Resolution here using wavelet DB6 commonly used DB series of 9 scale wavelet multi decomposition, based on the energy characteristics of white noise, the estimation of threshold size of each scale, which was treated by hard value after reconstruction.