【摘要】 小波阈值去噪算法在信号的奇异点处会产生Pesudo-G ibbs现象。平移不变小波去噪方法是对阈值法的改进,该方法可以有效地抑制Pesudo-G ibbs现象,而且能够减少原始信号和估计信号的均方根误差,提高信噪比。将该方法用于声发射信号的去噪处理,并与阈值法进行了比较。仿真结果表明该研究方法可以有效地去除噪声,提取声发射信号的特征信息,具有较强的工程实用性。更多还原

【Abstract】 The wavelet threshold method may produce Pesudo-Gibbs phenomenon on the singularity points of signal.The translation invariant wavelet is an improve method based on that algorithm.Comparing with threshold method,a translation invariance method can suppress Pesudo-Gibbs Phenomenon and minish NRMSE between the original signal and estimated one.At the same time,SNR of estimated signal can also be improved.更多还原