CAJ | 학술논문

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。
착대주동조성공제（ANC ）계통중왕왕존재빈솔실조（FM ）문제，전통적빈솔실조보상（FMC ）계통능응대일정정도적FM，단당조성신호비평은혹실조량교대시，계통장무법공작。침대차문제，본문제출일충대유빈솔고계적착대ANC계통신결구，기채용성학화비성학량로전감기획취삼고신호，인입가변겁반경급평활하강（PG ）산법구건IIR함파기，완성삼고신호적빈솔고계，통과일계FIR려파기실현폭치화상위적조절。방진표명，재보증합리적은태오차정황하，여전통적FMC계통상비，신계통능구응대교대적FM ，차구유량호적수렴화추종성능。
Since the narrowband active noise control (ANC) system always gives rise to frequency mismatch (FM) ,the tra-ditional frequency mismatch compensation (FMC ) technique can cope with small FM ,but is unable to deal with non-stationary noise signals or large FM .In order to solve the above problem ,a new ANC structure with a frequency estimator is first introduced ,whose 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 LMS (FXLMS) or RLS (FXRLS) algorithm .Simulations indicated that the new system ,in the condition of ensuring reasonable steady-state error ,compared with the traditional FMC system ,could effectively handle larger FM and revealed fine convergence and tracking performance .