一种新的子带滤波器组的设计

Design of Novel Subband Filter Banks

子带自适应滤波器系统的自适应滤波器系数是动态更新的,子带信号通过具有任意幅度和相位响应的滤波器时,完全重构滤波器组消除混叠影响的性能就得不到保证。为了克服这一缺点,通过一种新的子带滤波器组的设计方法,把分析综合滤波器作为一个整体,采用无约束二次优化方法,使综合滤波器组匹配分析滤波器组,在输出信号里单独抑制子带内的混叠失真。性能分析结果表明,该滤波器组的设计方法是有效的。

Adaptive filter coefficient is updated dynamically in subband adaptive filter system. When the subband signals are modified by filters with arbitrary magnitude and phase response, the perfect reconstruction property with aliasing cancellation is not maintained. In order to overcome this shortcoming, this paper proposes a design of novel subband filter banks the analysis filter and synthesis filter as a whole, using unconstrained quadratic optimization, let the synthesis filter banks match analysis filter banks, and separately suppress inband aliasing distortion in output signal. Performance analysis shows that the method of filter banks design is effective.