A novel multiple description coding scheme based on AMR-WB in converged IP network
Image and Signal Processing（2012）
摘要
AMR-WB (Adaptive Multi-Rate Wideband) codec has been standardized for wideband speech conversational applications and has widely potential applications in the migration of wireless or wired networks toward a single converged IF network. Multiple description coding (MDC) is frequently used to resist packet loss for Voice over IF (VoIF). However, today's MDC schemes for AMR-WB are designed lacking of necessary theoretical basis and can not perform well in either low or high packet loss conditions. In this paper, we compare the performance of different MDC schemes for AMRWB codec based on Rate-Distortion (R-D) theory. Based on the theoretical comparison results, we first propose an MDC scheme for high packet loss condition by considering the parameter importance; then, an adaptive MDC scheme is proposed for AMR-WB codec. Simulation results show that the proposed MDC scheme achieves substantial robustness in both low and high packet loss conditions.
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关键词
ip networks,internet telephony,broadband networks,network coding,radio networks,rate distortion theory,speech codecs,amr-wb-based multiple description coding scheme,r-d theory-based amr-wb codec,voip,adaptive mdc scheme,adaptive multirate wideband,high packet loss conditions,low packet loss conditions,multiple description coding,packet loss,rate-distortion theory-based amr-wb codec,single converged ip network,voice over ip,wideband speech conversational applications,wired networks,wireless networks,amr-wb,mdc
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