矿用多波主动噪声控制系统

为降低矿井噪声污染，提出了一个基于改进FXLMS算法的矿用多波主动噪声控制方案。针对矿井巷道较长，噪声源、次级声源间距离较远的特点，多波设计方案可以有效解决单波麦克风失匹配等带来的误差，改进FXLMS算法的矿用多波主动噪声控制方案使修正的误差信号趋于零，该设计方案能提高自适应滤波器的次级声路径权系数更新变化速度，减小权系数的变化对系统的影响，提高系统的收敛速度。采用Matlab对设计方案进行模拟仿真，仿真结果表明：设计方案的输入和扬声器输出基本上是频率、振幅相等，相位相反的信号，提出的设计方案将能有效地消除矿井三维空间内的噪声。

Multi wave active noise control system at the underground mine

To reduce the noise pollution in the coal mine,presented a mining multi wave active noise control scheme based on the improved FXLMS algorithm.For long roadway in coal mines and the far distances between the main and secondary noise sources,the multi wave scheme can effectively solve the problems of the single microphone’s mismatching errors.The multi wave active noise control scheme based on the improved FXLMS algorithm can even narrow down the modified error signals to zero.This scheme can increase the refreshing rate of the weight coefficients of the adaptive filters’ secondary noise path.Moreover,it can reduce the effects of the changing of weight coefficients on the system.And then it can increase the system convergence speed.The scheme is simulated by Matlab.The results illustrated that the scheme’s input and the speaker’s output are basically the signals of the same frequency,the same amplitude,and the inverse phrase.And the scheme is proved can effectively eliminate the noises in the 3 dimention space of the coal mine.