A Novel Multiple Description Coding Scheme based on AMR-WB in Converged IP Network

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 IP network. Multiple description coding (MDC) is frequently used to resist packet loss for Voice over IP (VoIP). 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 AMR-WB 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.