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Traditional Empirical Mode Decomposition(EMD) used in insulator leakage current de-noising easily leads to mode mixing problem, the Intrinsic Mode Function with mode mixing will lost the original physical meaning. An improved ensemble EMD(EEMD) of noise-assisted data analysis method to solve the problem of mode mixing in EMDs introduced. The performance of EMD and EEMD are compared by signal simulation...
In process of real time acquisition and transmission, the spectral signal obtained by miniature spectrometer may contain noise signals superposed on it. But the traditional denoising methods can't achieve the expected performance because of their limitations. A de-noising method for spectral signal in miniature spectrometer based on Stationary Wavelet Transform (SWT) is proposed. We compared the performance...
In the process of ultrasonic flaw detection to friction welded joints, a number of weak-binding defects are difficult to be correctly detected due to noise pollution. This article studies the semi-soft threshold denoising method of spatial correlation coefficient based on the traditional spatial correlation coefficient de-noising method and threshold de-noising method, and come up with an improved...
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