一种改进的自适应格型陷波滤波器

Modified adaptive lattice notch filter

为解决自适应格型陷波器在迭代过程收敛后存在陷波频率偏移的问题,通过严格的理论分析,论述了陷波参数与引入算子的关系.在推导得出收敛公式的基础上,给出了采用全局输出误差信号作为引入算子的自适应算法.改进后的自适应格型陷波器在不增加计算量的前提下,消除了陷波频率的偏移.仿真结果与理论分析相一致.

The relationship between coefficients and regressor is detailed based on the theoretical analysis. According to the deduced convergence equation, a modified algorithm is put forward by using the global error signal as the regressor. This algorithm has a reduced bias of the notch frequency in comparison to the conventional algorithm and employs the same number of multipliers and adders. Simulation results confirm the theoretical analysis.