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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 ,对声学反馈现象确实具有明显的抑制作用
Because the acoustic feedback channel introduces a new pole to the ANC system, the instability of the system is possible.In order to compensate the feedback gain of the feedback channel, the structure of the IIR filter with zero-pole and the FU-LMS algorithm are introduced.By theoretical analysis and computer Simulation and discuss the influence of the parameters of FU-LMS algorithm on the system performance.The results show that the ANC system with IIR filter structure has a significant inhibitory effect on the acoustic feedback phenomenon