无完全重构约束的两通道自适应FIR滤波器组设计  

Design of Two-Channel Signal-Adapted FIR Filterbanks without Perfect Reconstruction Constraints

作　　者：王兰美[1] 水鹏朗[1] 廖桂生[1] 王桂宝[1] 

机构地区：[1]西安电子科技大学电子工程学院,西安710071

出　　处：《电子与信息学报》2005年第4期570-573,共4页Journal of Electronics & Information Technology

摘　　要：该文研究了在无完全重构约束情况下两通道自适应FIR无混叠滤波器组的时域设计方法。由于放松了对 完全重构的约束,子带编码器的失真由系统失真和量化失真两部分构成。在整体比特数和输入过程给定的情况下, 本文通过优化滤波器系数,使得子带编码器的整体失真达到最小,实现提高其编码增益的目的。后面的设计实例验 证了该方法的有效性。This paper investigates the time-domain design method of two-channel signal-adapted FIR alias-free fllterbanks without Perfect Reconstruction (PR) constraints. For subband coders based on fllterbanks without PR constraints, the total distortion is composed of two parts: the systemic distortion and quantization distortion. For a given total bit budget, the minimization of the total distortion is an unconstrained nonlinear programming. Due to its high nonlinearity, the design results greatly depend on selection of initial fllterbanks. Two approaches to select the initial fllterbanks, the associated algorithm and designs of several examples are given in this paper. The obtained signal-adapted fllterbanks achieve larger subband coding gains than the existing methods, which verifies our method is effective.

关 键 词：靠近无完全重构约束 滤波器组 子带编码增益 

分 类 号：TN957.5[电子电信—信号与信息处理] TN713[电子电信—信息与通信工程]