AMR语音编码技术在多环境下的性能分析及优化  

Analysis of AMR Codec Performance Under Multiple Circumstances and Codec Algorithm Improvement

作　　者：吴恒[1] 汪纪锋[1] 

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《电声技术》2009年第11期77-80,共4页Audio Engineering

摘　　要：自适应多速率语音编码是3GPP制定的主要应用于第三代移动通信W-CDMA系统中的语音压缩编码,当无线环境中的信道质量发生改变时,能通过自适应地改变语音编码方式对其进行差错纠正和保护。对比了传统GSM与AMR2种编码技术,对其在不同环境下的部分性能进行测试并分析结果;结合现有AMR算法原理,提出了一种有效降低运算量的代数码本快速搜索的方法,最后对其结果进行仿真验证。AMR codec technique is primary applied in the 3rd generation mobile system W-CDMA which is set down by the 3GPP, and ensures that speech quality is optimized in a mobile station by verifying its ability to determine when to request a change to another codec with either more or less error correction and protection as signal quality changes. The GSM and AMR codec performance under different circumstances are tested and compared. Besides, in order to reduce the computations, an improved algebraic codebook searching method is proposed, and the simulation results are given.

关 键 词：自适应多速率 多环境测试 部分搜索 

分 类 号：TN912[电子电信—通信与信息系统]