摘要
ITU-T建议G.729、G.729 AnnexA和G.723.1是国际电信联盟(ITU)最新颁布的3种适用于多媒体通信的低比特率线性预测语声编码器标准。文章介绍了语声编码器的比特率、复杂度、延迟和音质等性能指标的含义,并通过比较3种标准的新型声码器在算法和性能指标上的异同点,讨论了它们在多媒体通信中的不同应用。
Newly issued by the International Telecommunications Union(ITU), Rec G.729, Rec G.729 Annex A and Rec G.723.1 are three standards of speech coders, applicable to low bit-rate multi- media communications. This paper intro- duces the implications of speech coder's performance indices such as bit-rate, complexity, delay, speech quality and so on. It also discusses the different appli- cations of these three coders by compar- ing their similarity and differences in both algorithm and performance.
关键词
多媒体通信
语音编码器
声码器
Rec G. 729
Rec G. 729A
Rec G. 723.1
ITU
Multimedia Communication
