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中文摘要：
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.
英文摘要：
Since the narrow band active noise control（ ANC） system alw ays gives rise to frequency mismatch（ FM）,the traditional frequency mismatch compensation（ FMC） technique can cope w ith small FM,but is unable to deal w ith nonstationary noise signals or large FM. In order to solve the above problem,a new ANC structure w ith a frequency estimator is first introduced,w hose inputs are measured by both the acoustic and non-acoustic sensors. The IIR notch filter based on plain gradient（ PG） algorithm is employed as the frequency estimator,and the adjustment of amplitude and phase of secondary source is achieved by a first-order FIR filter updated by filtered-x LM S（ FXLM S） or RLS（ FXRLS） algorithm. Simulations indicated that the new system,in the condition of ensuring reasonable steady-state error,compared with the traditional FM C system,could effectively handle larger FM and revealed fine convergence and tracking performance.
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