MPEG-2音频实时压缩编解码的一种快速算法  

A FAST ALGORITHM FOR REAL-TIME MPEG-2 AUDIO CODING AND DECODING

作　　者：刘常澍[1] 马欣[1] 李文元[1] 张毓忠[1] 

机构地区：[1]天津大学电子信息工程学院,300072

出　　处：《电子与信息学报》2001年第2期147-153,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金

摘　　要：该文介绍采用一片TI公司的数字信号处理芯片TMS320C31实现了MPEG-2音频Layer-1,2实时压缩编解码器。为了达到实时的目的,对MPEG建议的子带分析和子带合成方案分别提出了一种新的快速算法,采用该算法的运算量分别是MPEG标准建议算法运算量的1/5和1/10。所有算法都经过了软件模拟和硬件实时仿真,通过仿真器装载到一片TMS320C31上实现了实时编解码运算。A real-time MPEG-2 layerl,2 audio CODEC realized on one TMS320C31 chip, which is a new DSP product of TI, is developed in this paper. In order to realize code & decode in real-time, new fast algorithms for MPEG-2 audio sub-band analysis filter and sub-band synthesis filter are presented respectively. Using these fast algorithms, the computational load of sub-band analysis/synthesis can be reduced to 1/5 and 1/10 that of the original algorithms respectively. All the algorithms have been simulated on software and hardware. Through a simulator, the programms are loaded to a TMS320C31 and realize code and decode in real-time.

关 键 词：心理声学模型 MPEG-2 音频实时压缩编解码 数字信号处理 

分 类 号：TN912.3[电子电信—通信与信息系统]