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-2AUDIO CODING AND DECODING
-
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。Abstract: 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 realtime.
-
MPEG,ISO/IEC 13818-3, Generic coding of moving pictures and associated audio,part3,Nov,1993.[2]T.Imai,J.Shiokaxa,H.Chiba,MPEG-1 audio real-time encoding system,IEEE Trans.on Consumer Electronics,1998,CE-44(3),888-894.[3]Chen Yu-Chi, Tsai Chien-Wu, Fast time-frequency transform and their applications to real-time software implenentation of AC-3 audio CODEC, IEEE Trans. on Consumer Electronics,1998,CE-44(2),413-423.[4]Masahiro Iwadare, Akihiko Sugiyama, A 128 kB/S HI-Fl audio CODEC based on adaptive transform coding with adaptive block size MDCT, IEEE J. On Selected Areas in Communications,1992,44(2),138-144.[5]Chen Jing,Tai Heng-Ming, Real-time implementation of the MPEG-2 audio CODEC on a DSP,IEEE Trans. on Consumer Electronics, 1998,CE-44(3),866-871.
计量
- 文章访问数: 2452
- HTML全文浏览量: 133
- PDF下载量: 875
- 被引次数: 0