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一种应对非平稳频率失调的窄带主动噪声控制系统

DOI: 10.16383/j.aas.2015.c130797, PP. 186-193

Keywords: 窄带主动噪声控制,频率失调补偿,非平稳噪声,动量最小均方,变步长滤波-X最小均方

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Abstract:

?在窄带主动噪声控制(Activenoisecontrol,ANC)系统中,参考信号频率失调(Frequencymismatch,FM)和噪声信号非平稳将会使系统性能下降,甚至失效.本文提出一种基于动量最小均方的改进FM补偿算法,通过在代价函数中引入加权累加的平方误差,提升系统的追踪和收敛能力.并分别与基于滤波-X最小均方(Filtered-Xleastmeansquare,FXLMS)、滤波-X递归最小二乘(Filtered-Xrecursiveleastsquare,FXRLS)和变步长滤波-X最小均方(Variablestep-sizefiltered-Xleastmeansquare,VSS-FXLMS)算法的主控制系统结合,共同完成系统综合性能的提高.大量仿真分析表明,新的FM补偿算法在非平稳的FM和离散傅里叶系数翻转的条件下仍能保持较高的追踪能力和合理的残余误差.

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