SELP声码器参数抗差错恢复算法  

Error correction scheme for SELP vocoder parameters

作　　者：孙致钊[1] 李晔[1] 徐敬德[1] 崔慧娟[1] 唐昆[1] 

机构地区：[1]清华大学电子工程系微波与数字通信技术国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2010年第5期780-783,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(60572081)

摘　　要：针对低速率语音编码领域的正弦激励线性预测(SELP)声码器,提出了一种错误帧参数修复算法。对于信道编解码不能纠错的语音帧,算法根据信道解码后所指示的错误信息,结合解码端各参数平稳性的不同,采用参数替换方法分别进行修复。测试结果表明:采用该算法,在1%、3%、5%的随机信道误码下,声码器抗误码性能均有较大改善,特别是在5%的较高信道误码率下,合成语音平均意见得分提高了0.2以上。An error frame restoration algorithm was developed based on SELP,a very important model in the low bit speech coding domain.The algorithm was used to reconstruct various parameters that can not be corrected using the channel decoding algorithm according to the error information as well as the different characteristics of these parameters.Tests show that the speech quality is obviously improved at channel error rates of 1%,3% and 5%,especially with the average mean opinion score being increased by over 0.2 with the channel error rate of 5%.

关 键 词：语音编码 信道误码 差错恢复 

分 类 号：TN912.34[电子电信—通信与信息系统]