M带余弦调制滤波器组的设计

摘要

A method for designing M-band cosine-modulated filter banks with near perfect reconstruction is proposed. The prototype filter is formulated as the form A (zL) B (z) and indirectly designed by varying the passband edge of A ( z ) with low order. In the course of the optimization procedure,the popular Parks-McClellan algorithm is used to design A(z) .A design example is presented to show that cosine-modulated filter banks with high stop attenuation can be achieved using the proposed method.%本文提出了一种近似重构的M带余弦调制滤波器组的设计方法。该方法将原型滤波器表示成A(zL)B(z)的形式，通过优化低阶FIR滤波器A(z)的通带边缘频率，间接设计原型滤波器。在优化过程中，采用常用的Parks-McClellan算法设计滤波器A(z)。文中给出的设计例子表明，该方法可获得很高阻带衰减的滤波器组。