摘要
研究了小波阈值去噪方法在超声信号处理中的应用。在对用超声方法测得的信号进行去噪处理的过程中,探索了不同的小波基和阈值选取准则对阈值去噪结果的影响。通过对去噪信号的图形以及统计特性的分析和比较,选用Sym小波系中的Sym8小波和“Minimaxi”阈值选取准则对测得的信号进行去噪处理。实验结果表明:小波阈值去噪方法在超声检测去噪中能够取得较好的效果。
In this paper, we mainly study the application of wavelet threshold de-noising method in processing ultrasonic signal. In the process of de-noising the signal inspected by ultrasonic method, influences from different wavelets and threshold selection rules on the result are discussed in this paper.Through analyzing and comparing figures of de-noised signal and their statistic characteristics, the Sym8 wavelet of Sym wavelet series and the ＂Minimaxi＂ of threshold selection rules are selected and used to de-noise the inspection signal. Experiments show that preferable result can be acquired by de- noising ultrasonic inspection signal with wavelet threshold de-noising method.
出处
《噪声与振动控制》
CSCD
北大核心
2006年第3期35-38,共4页
Noise and Vibration Control
关键词
声学
噪声治理
超声检测
小波变换
阈值去噪
acoustics
de-noising
ultrasonic inspection
wavelet transform
threshold de-noising
