Signal Processing Methods of Enhanced Magnetic Memory Testing

As a particular kind of detection technology under weak magnetization, metal magnetic memory testing is very likely to be affected by external factors in the detecting process, which may lead incorrect results. In order minimize negative influence interrupting signals and improve accuracy, this paper adopted enhanced method preliminarily increase signal-to-noise ratio (SNR) signal then compares denoising effects wavelet threshold method, empirical mode decomposition (EMD) EMD-wavelet ensemble EMD (EEMD), complementary EEMD (CEEMD), variational (VMD), local mean (LMD) transform (EWT) on gradient respectively. The results show that can significantly SNR obtained cannot generated from signal. different methods further boost accuracy Among eight processing methods, threshold, its improved are more applicable signals. Wavelet denoising, all have good effects, same analogous.