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电子学报  2015 

基于IIR陷波器应对频率失调的窄带ANC系统新结构

DOI: 10.3969/j.issn.0372-2112.2015.01.020, PP. 129-134

Keywords: 窄带主动噪声控制,频率失调,非平稳噪声,IIR陷波器,可变极半径

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Abstract:

窄带主动噪声控制(ANC)系统中往往存在频率失调(FM)问题,传统的频率失调补偿(FMC)系统能应对一定程度的FM,但当噪声信号非平稳或失调量较大时,系统将无法工作.针对此问题,本文提出一种带有频率估计的窄带ANC系统新结构,其采用声学和非声学两路传感器获取参考信号,引入可变极半径及平滑下降(PG)算法构建IIR陷波器,完成参考信号的频率估计,通过一阶FIR滤波器实现幅值和相位的调节.仿真表明,在保证合理的稳态误差情况下,与传统的FMC系统相比,新系统能够应对较大的FM,且具有良好的收敛和追踪性能.

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