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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。
ITU-T Recommendations G.729, G.729 Annex A and G.723.1 are the latest three low-bit-rate linear predictive speech coder standards for multimedia communications promulgated by the International Telecommunication Union (ITU). This paper introduces the meanings of the performance indexes such as bit rate, complexity, delay and sound quality of the vocoder. By comparing the similarities and differences between the algorithms and the performance indexes of the new vocoder of the three standards, we discuss their applications in multimedia communications In different applications.