Multi-Level Error Detection and Concealment Algorithm to Improve Speech Quality in GSM Full Rate Speech Codecs  

作　　者：王林芳 刘加 刘小青 李明 

机构地区：[1]Department of Electronic Engineering,Tsinghua University

出　　处：《Tsinghua Science and Technology》2011年第3期247-255,共9页清华大学学报（自然科学版（英文版）

基　　金：Supported by the National Natural Science Foundation of China andMicrosoft Research Asia (No.60776800);in part by the National High-Tech Research and Development Program (863) of China (Nos. 2006AA010101, 2007AA04Z223, 2008AA02Z414,and 2008AA040201)

摘　　要：Digital mobile telecommunication systems, such as the global system for mobile （GSM） system, want to further improve speech communication quality without changing the channel encoders and decoders. Speech quality is most affected by residual bit errors in received speech frames. Conventional methods use binary decision strategies for error detection and concealment in frames. This paper presents a multi-level error detection and concealment algorithm for GSM full rate speech codec systems. The algorithm uses multi-source knowledge to detect and conceal speech frame errors at the frame, parameter, and even bit levels. Tests show that most corrupted frames can be appropriately concealed by this algorithm, resulting in MOS gains of more than 50% for real-world data tests.Digital mobile telecommunication systems, such as the global system for mobile （GSM） system, want to further improve speech communication quality without changing the channel encoders and decoders. Speech quality is most affected by residual bit errors in received speech frames. Conventional methods use binary decision strategies for error detection and concealment in frames. This paper presents a multi-level error detection and concealment algorithm for GSM full rate speech codec systems. The algorithm uses multi-source knowledge to detect and conceal speech frame errors at the frame, parameter, and even bit levels. Tests show that most corrupted frames can be appropriately concealed by this algorithm, resulting in MOS gains of more than 50% for real-world data tests.

关 键 词：speech coding error detection error concealment speech quality global system for mobile （GSM） 

分 类 号：TN929.532[电子电信—通信与信息系统]