具有良好重建特性的正交镜像IIR滤波器组的设计新方法  

Novel Design of Perfect Reconstructed Quadrature Mirror IIR Filter Banks

作　　者：陈华丽[1,2] 程耕国[1] 

机构地区：[1]武汉科技大学冶金自动化与检测技术教育部工程研究中心,武汉430081 [2]武汉大学电气工程学院,武汉430072

出　　处：《计算机科学》2009年第8期92-93,115,共3页Computer Science

基　　金：国家自然科学基金(No.60672064);武汉科技大学科学研究发展基金(No.2006XZ3)资助

摘　　要：提出了一种新的设计两通道近似完全重构IIR滤波器组的方法。分析滤波器组由基于全通滤波器的多相网络实现,所引起的相位失真几乎完全被综合滤波器组所平衡。从QMF的完全重构理论出发,提出综合滤波器组也由全通滤波器来实现,整个系统的设计就转化成相位均衡器的设计,并且给出构成综合滤波器组的稳定的全通滤波器的封闭解析表达式。仿真结果证明,本方法设计的系统不仅完全消除了幅度和混叠失真,相位失真可以在附加一定的信号延时的基础上进行最小化,而且计算量小,系统恒稳定。A novel design for a two-channel IIR quadrature mirror filter （QMF） bank with near-perfect reconstruction was presented in this thesis. The analysis filter bank was given by an efficient poly-phase network implementation based on all-pass filters. The arising phase distortions were almost compensated by the synthesis filter bank. Based on the theory of the perfect reconstruction of QMF, the synthesis filter bank was also given by the stable all-pass filters, designed via analytical closed-form expressions, so the design of IIR QMF was transformed into the design of the phase equalizer. The simulation results show that the aliasing and amplitude distortions are completely canceled, and phase distortions minimized at the expense of an additional signal delay. The proposed IIR QMF banks have a lower algorithmic complexity and are always stable.

关 键 词：正交镜像滤波器组 无限冲激响应滤波器 全通滤波器 多相网络 

分 类 号：TN911.72[电子电信—通信与信息系统]