一种优化延迟链结构的线性相位准正交数字滤波器组的算法

A factorjzation algorithm for linear-phase paraunitary filter banks with optimized delay chains

研究了线性相位准正交滤波器组的新优化设计算法．该设计算法对因子分解中的延迟环节数进行了优化，在新算法中，滤波器的长度将逐渐随级联的格型结构和延时链路而减少．滤波器长度和对称性的可能分布，可在设计过程中决定．文中给出设计算法以及７信道情况下的设计样例．

In this paper an optimized design algorithm for linear-phase paraunitary filter banks is presented in which the number of rings in delay chains for use in the lattice structures in factorizatlon is optimized. In the algorithm, the filter lengths are gradually reduced through a cascode of the lattice structures and the delay chains. The possible distribution of filter lengths and symmetry can be determined in the course of design. Besides the algorithm, design examples with 7-channel filter banks are given.