摘要
目前,几乎所有的语音电话系统(VoIP)都采用固定速率传输,这使得网络丢包,特别是连续丢包无法避免,因此导致了严重的语音质量下降。针对这一问题,给出了一种新的抗分组丢失的网络语音通信系统,并用网络仿真软件NS(networksimulator)对该系统进行了性能分析,仿真实验证明,所提出的网络语音通信系统在网络丢包、平均延迟和主观听觉方面明显优于传统的IP语音电话系统。
Most of the VolP systems were based on the speech codec with a fixed rate, which maked packet-loss serious, especially for continuous packet-loss. The degradation for the speech quality would be caused by the kind of packet-loss. A network communication system for preventing packet-loss was given. The performance of the system was analyzed by using advanced NS. The simulation results show that the proposed system outperforms traditional IP system over the packet-loss, average delay and subjective listening quality.
出处
《通信学报》
EI
CSCD
北大核心
2006年第6期121-125,133,共6页
Journal on Communications
基金
北京市科委科技发展项目资助项目(KM200310005024)
北京市科技新星计划资助项目(953811300)~~
