论文标题:第三代移动通信AMR声码器的研究与开发
Research and Development of AMR Speech Coder in the 3rd Generation Mobile Communication System
论文作者 赵路
论文导师 张永瑞,论文学位 硕士,论文专业 电路与系统
论文单位 西安电子科技大学,点击次数 155,论文页数 66页File Size3265k
2002-01-01论文网 http://www.lw23.com/lunwen_52525677/ AMR;线性预测分析;语音合成;误码隐藏处理单元;回波抵消
AMR;Liner predict analythsis;Speech synthesization;ECU;Echo cancellation
AMR语音编解码标准是3GPP提出的第三代移动通信系统W-CDMA的语音编解码标准。本文主要对AMR语音编解码算法进行了分析和研究。在此基础上，描述了一种较为先进的大型DSP系统程序开发策略，并以此为指导思想，以美国TI公司C6000DSP开发平台开发出了整个AMR解码器单元的系统程序。论文对AMR解码器的误码隐藏处理单元进行了重点分析，针对原有算法合成语音自然度不好的缺点，论文研究了将谱外推法应用到AMR算法中外推出声道模型反射系数参数进行误码消除处理。最后，文章分析了现有移动通信中的回波抵消算法，针对不同的算法和算法中的不同参数，研究了它们在工程应用中的计算量，并进行了回波抵消效果的的仿真。
AMR speech coder is a new speech coder recommendation produced by 3 GPP using on the 3rd generation mobile communication system W-CDMA.This paper mainly deal with the algorithms of AMR speech coder. On the basis of the study on the speech coder algorithms,paper describe an advanced method of developing DSP system software,and as the guidlines ,we developed the programme of whole decoder unit.Paper stress on analysis of the ECU in decoder unit.Aiming at AMR algorithms disadvantage of angularity of synthetical speech, Paper study on the specutral extrapolation which apply to extrapolate reflect coefficient of track model to make error conceal processing of AMR.At last paper analyze existing echo cancellation algorithms using on mobile communication system. According to different algorithms and different parameters .Paper analyze the efficiency of algorithms , and simulate the echo cancellation result.
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