摘要
为了有效消除声发射信号中的噪声,将广义S变换滤波方法应用于声发射信号去噪,分别采用广义S变换中的充零法、基于带通滤波器设计滤波算子法以及时频滤波法进行滤波比较,针对信号的不同时频特性设计了相应的时频滤波算子。结果表明,基于S变换的三种时频滤波法对声发射信号的去噪均有较好的效果,克服了传统滤波方法滤波因子不能随时间、频率变化而变化的缺陷。其中时频滤波法在高信噪比和低信噪比情况下都能更好地去除噪声,可以满足信号处理的要求。
Based on generalized S transform (GST) zero-filling, design operator using band-pass filter and time-frequency filtering were applied to AE signals denoising. It designed the corresponding time-frequency filtering operators for the different frequency characteristics of signals. Experimental results show that the time-frequency filtering based on GST has obvious advantages. It can effectively remove the noises in the case of both the high signal to noise ratio(SNR) and the low SNR.
出处
《计算机应用研究》
CSCD
北大核心
2011年第12期4535-4536,4540,共3页
Application Research of Computers
基金
国家"973"重点基础研究发展规划资助项目(2007CB209407)