计算机应用 ›› 2010, Vol. 30 ›› Issue (3): 761-764.

• 网络与通信 • 上一篇    下一篇

基于语音质量预测的Speex自适应码率控制算法

蔡铁1,龙志军2,伍星1   

  1. 1. 深圳信息职业技术学院
    2. 中兴通讯股份有限公司
  • 收稿日期:2009-09-29 修回日期:2009-11-11 发布日期:2010-03-14 出版日期:2010-03-01
  • 通讯作者: 蔡铁
  • 基金资助:
    VoWLAN中基于终端的高品质语音通话技术研究;基于语音识别技术的汽车网络导航服务系统

Adaptive rate control algorithm of Speex codec based on speech quality prediction

  • Received:2009-09-29 Revised:2009-11-11 Online:2010-03-14 Published:2010-03-01
  • Contact: Cait Tie

摘要: 为实现IP语音(VoIP)质量的动态管理与控制,提出了一种基于语音质量预测的自适应码率控制算法。通过实时预测VoIP通话的瞬时语音质量和总体语音质量,自适应地调整Speex编码参数,从而根据需要选择最佳编码速率。实验仿真结果表明,提出的算法能够有效减少网络拥塞,提高VoIP系统的语音质量。

关键词: IP语音, 语音编码, Speex, 自适应码率控制, 语音质量预测

Abstract: To manage and control the speech quality of VoIP communication dynamically, an adaptive rate control algorithm based on speech quality prediction was proposed. This algorithm predicted the instantaneous speech quality and the integral speech quality of VoIP in real time to adjust the encoding parameters of Speex codec adaptively. Then it selected the optimal encoding bit rate in need. The simulation results demonstrate that the proposed algorithm indeed reduces the network congestion and improves the speech quality of VoIP system.

Key words: VoIP, speech coding, Speex, adaptive rate control, speech quality prediction