一种复合式宽带有源噪声控制算法

Combined Algorithm for Broadband Active Noise Control

为获得更高的宽带噪声控制效果,提出了一种复合结构有源噪声控制算法。该算法将传统FXLMS算法和DFT-FSF算法并行运行,实现对宽带和窄带噪声的同时降噪。新的复合式算法对正弦波噪声实现高达45 dB的降噪,而对带限白噪声的平均降噪量则达到15 dB。仿真结果证明了算法的有效性。

A combined algorithm for broadband active noise control is proposed to achieve a high noise control effect. Two algorithms, namely the filtered-X LMS algorithm and the DFT- frequency sampling filter （DFT-FSF） based algorithm are combined together to form the proposed algorithm. The algorithm enables wide band and narrow band noise controls simultaneously. It can achieve the control effect up to 45 dB for sine wave noise and the average control effect up to 15 dB for band limited white noise. The performance of the algorithm is demonstrated by simulation results.