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Title:: Application of the Optimum Wavelet Packet Transform in Seismic Signals De-noising

作者:: 张瑞红¹; 2; 林大超²; 乔兰¹; (1.北京科技大学土木与环境工程学院,北京 100083; 2.华北科技学院土木工程系,北京 101601)

Author(s):: ZHANG Rui-hong¹; 2; LIN Da-chao²; QIAO Lan¹; (1.Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China)(2. Department of Civil Engineering, North China Institute of Science and Technology, Beijing 101601, China)

摘要:: 应用最优小波包变换,采用取决于节点噪声时频特征的相关阈值,对模拟地震波到达的加噪合成信号、SDAES 数字声发射仪采集的微震实验信号、NIED观测台站记录的日本2007年能登半岛地震信号进行去噪,并和基于小波变换的其他方法进行了去噪效果比较。结果表明,该方法获得的信号信噪比(SNR)高、失真低,体现出了总体优越性。

Abstract:: We apply the node-dependent threshold relative to the characteristics of the time-frequency of the noise to the optimum Wavelet Packet Transform(WPT)method to denoise a synthetic noisy signal of the arrival of the simulative seismic wave,an experimental micro-seismic signal collected by a digital acoustic emission instrument, SDAES, and a seismic signal of 2007 Noto Hanto Earthquake in Japan recorded at NIED observatory. We find that the signal denoised by the optimum WPT method has a higher signal-to-noise ratio(SNR)and a lower distortion than those by other methods based on wavelet transform(WT)methods, and the WPT method shows the overall superiority.