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 Matlab softwave. 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.%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.
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