ANC系统的FU-LMS算法及其性能分析

ANC System with FU-LMS Algorithm and Its Performance Analysis

由于声反馈通道向 ANC系统引入了新的极点 ,导致系统有失稳的可能性 .为了补偿反馈通道的反馈增益 ,引入具有零极点的 IIR滤波器结构和 FU- LMS算法 .通过理论分析和计算机仿真 ,讨论了 FU- LMS算法各参数对系统性能的影响 .结果表明 ,采用 IIR滤波器结构的 ANC系统 。

Because of the introduction of additional poles to the system by acoustic feedback channel, there exists the possibility of unstability of ANC system. In order to compensate this feedback effect, an IIR filter with zeros and poles and FU LMS algorithm were introduced. The effect of the parameters in FU LMS algorithm on ANC system performance was introduced through theoretical analysis and computer simulation. It is shown that in the ANC system with IIR filter the acoustic feedback effect has been apparently abated.