两带自适应FIR线性相位双正交滤波器组设计  

Design of Signal-adapted Two-Band Biorthogonal Linear Phase Filter Banks

作　　者：水冰[1] 史仪凯[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《电子与信息学报》2006年第10期1950-1954,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(50275125);航空科学基金(04I53068)资助课题

摘　　要：自适应滤波器组设计是多速率滤波器组理论和应用的一个重要方面。由于其频率响应更好匹配于输入信号的统计特性,这类滤波器组可获得更大的子带编码增益。该文研究了两带自适应FIR线性相位双正交滤波器组的设计问题,给出了设计算法,特别是通过最优IIR双正交滤波器组确定初始点(初始滤波器组)的方法。仿真结果表明,得到的滤波器组的子带编码增益远远超过了最优的IIR正交滤波器组,与已有的设计结果比较,编码增益明显提高。Signal-adapted institute of filter banks are an important subject in the theory and applications of the multirate filter banks.Since the frequency responses match the statistics of the underlying signals very well, these filter banks achieve the larger subband coding gains. This paper investigates the design of two-band signal-adapted biorthogonal linear phase filter banks and gives the design algorithm, in particular, the method to determine the initial points （initial filter banks） with the optimal IIR biorthogonal filter banks that is easy to be obtained. The result of emulation indicates that the subband coding gains of the resulted filter banks are excess those of the optimal IIR paraunitary filter banks much, and comparing with the existing results the subband coding gains are markedly improved.

关 键 词：主分量滤波器组 子带编码增益 线性相位 最优IIR双正交滤波器组 

分 类 号：TN713[电子电信—电路与系统]