一种高阻带余弦调制滤波器组的子带有源噪声控制

Subband active noise control using cosine-modulated filter banks with high-stopband attenuation

针对宽带有源噪声控制(ANC)系统,在采用子带自适应滤波结构时,由分析滤波器组的非理想特性及下采样原因引起的子带信号混叠问题,采用内插脉冲响应技术间接设计了一种高阻带衰减的低通原型滤波器,使得阻带能量最小化来直接消除子带信号间的混叠问题,具有较低的计算复杂度。同时,通过采用补偿误差通道延迟的方法来消除由分析滤波器组产生的延迟。仿真实验结果表明,该算法在宽带高斯白噪声和宽带有色信号下都具有较好的收敛性能,尤其对宽带有色信号。

For wide band active noise control （ANC） system, as a result of the non-ideal characteristic and downsam- piing of the analysis filter banks, the aliasing problem between subband signals in the subband adaptive filter struc- ture is introduced. An interpolated finite impulse response filter （IFIR） is employed to indirectly design the cosine~ modulated filter banks prototype filter with high-stopband attenuation to achieve stopband energy minimization, in order to directly eliminate the aliasing problem between subband signals. It has low computational complexity. And compensation the error path delay avoids the delay of cosine-modulated filter banks. Simulation results show that this algorithm has good performance in the broadband gauss white noise and broadband color signal, especially for broadband color signal