MPEG-2音頻實時壓縮編解碼的一種快速算法
A FAST ALGORITHM FOR REAL-TIME MPEG-2AUDIO CODING AND DECODING
-
摘要: 該文介紹采用一片TI公司的數(shù)字信號處理芯片TMS320C31實現(xiàn)了MPEG-2音頻Layer-1,2實時壓縮編解碼器。為了達到實時的目的,對MPEG建議的子帶分析和子帶合成方案分別提出了一種新的快速算法,采用該算法的運算量分別是MPEG標準建議算法運算量的1/5和1/10。所有算法都經(jīng)過了軟件模擬和硬件實時仿真,通過仿真器裝載到一片TMS320C31上實現(xiàn)了實時編解碼運算。
-
關(guān)鍵詞:
- 子帶分析濾波; 子帶合成濾波; 心理聲學(xué)模型
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. -
計量
- 文章訪問數(shù): 2476
- HTML全文瀏覽量: 140
- PDF下載量: 878
- 被引次數(shù): 0
下載:
