CELP编码中LSP参数冗余分析  

Research of Residual Redundancy Inherent in CELP LSP Parameters

作　　者：毛志远[1] 

机构地区：[1]同济大学电子与信息工程学院信息与通信工程系,上海201804

出　　处：《中国新通信》2009年第23期64-66,共3页China New Telecommunications

摘　　要：带宽限制和信道噪声失真是当今通信两大重要问题,信号在噪声信道中的可靠性传输已成为当前通信研究的热点。本文通过对4.8kbit/sCELP(Code-ExcitedLinearPrediction)中线谱对参数LSP(LineSpectralPair)的定量计算,分别引入一阶和二阶马尔科夫链分别作LSP参数相关性模型以区别CELP中LSP参数帧内和帧间冗余,并采用TIMIT语音库的语音序列结合以上模型对LSP参数冗余进行定量计算。为进一步研究语音在噪声信道中的可靠传输提供了理论依据和研究方法。Constraints on the available bandwidth and channel noise distortion are two important problems in today＇s communication. Reliable transmission of speech over noisy communication channels has been a hotspot of relevant research. In this paper, we provides a basis for reliable transmission of speech over noisy communication channels by quantifying the amount of residual redundancy inherent in the CELP line spectral pair （LSP） parameters . First and second-order Markov chains are introduced to model the LSP correlation within a speech frame and between frames, respectively. A large training sequence from the TIMIT speech database is used in conjunction with these models to quantify the redundancy found within the LSP＇s.

关 键 词：语音通信 可靠传输 CELP 冗余信息 马尔科夫链 

分 类 号：TN911.22[电子电信—通信与信息系统]