基于定点DSP的子带分析滤波器快速算法  

Fast Algorithm for Subband Analysis Filter Based on Fixed-point DSP

作　　者：尤扬[1] 胡剑凌[1] 朱敏[1] 徐盛[1] 

机构地区：[1]上海交通大学图像通信与信息处理研究所,上海200030

出　　处：《电声技术》2006年第2期34-36,40,共4页Audio Engineering

摘　　要：提出了一种改进的子带分析滤波器算法,可以应用到基于子带编码的高保真数字音频编码器(如MPEGaudio-layer3)中。改进算法充分利用了余弦函数的对称性,不仅有效减少了运算量和存储空间,同时也避免了使用除法运算所带来的精度损失,易于在定点DSP上实现。This paper presents a modified algorithm for subband analysis filter, which is applicable to high fidelity digital audio compression algorithm using subband coding （such as MPEG audio-layer3 standard）. This modified algorithm, which makes full use of the symmetry of cosine function, can not only reduce computational load and memory space, but also avoid precision loss that introduced by division operation. So it is convenient for the implementation on a fixed-point DSP.

关 键 词：子带分析滤波器 MPEG 音频编码 DSP 

分 类 号：TN713[电子电信—电路与系统]