摘要
采用基于线性组合器的一种谱线增强算法,对窄带振动信号进行消噪处理。针对传统自适应谱线增强算法的不足,提出一种输出反馈的LMS算法,将滤波器输出的历史信息与线性组合器的输出加权后迭加,构成新的滤波器输出,从而构成新的滤波算法。利用MATLAB仿真了该新型组合滤波器消噪效果,仿真分析中将该消噪方案用于仿真信号实际采集的信号。通过仿真验证,新算法的去噪性能优于原来算法。
A spectral-line enhancement algorithm based on a linear combiner was used to denoise narrow vibration signals. Aiming at the disadvantage of the traditional adaptive spectral-line enhancement algorithm, a new LMS algorithm with output feedback was proposed here, it superposed the historic information exported by a filter and the output exported by a linear combiner to form the new output. So a new algorithm was set up. The effect of the new combined filter was simulated with Maflab software. The simulated signal and the actual one were used in a simulation analysis. The results showed that the new algorithm is better than the original one in time domain and its denoising performance is verified.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第1期140-143,共4页
Journal of Vibration and Shock
基金
河北省自然科学基金(E2009001431)
关键词
自适应滤波
自适应谱线增强
降噪
定步长LMS
adaptive filtering
adaptive spectral-line enhancement
denoising
fixed step-size LMS
