Wireless Personal Communications

, Volume 45, Issue 2, pp 189–207

A New Buffer Algorithm for Speech Quality Improvement in VoIP Systems


    • Motorola Inc.
    • Signal Processing & Multimedia Communications GroupUniversity of Plymouth
  • Ramesh K. Venkatasubramanian
    • Motorola Inc.
  • Lingfen Sun
    • Signal Processing & Multimedia Communications GroupUniversity of Plymouth
  • Emmanuel C. Ifeachor
    • Signal Processing & Multimedia Communications GroupUniversity of Plymouth

DOI: 10.1007/s11277-007-9408-7

Cite this article as:
Qiao, Z., Venkatasubramanian, R.K., Sun, L. et al. Wireless Pers Commun (2008) 45: 189. doi:10.1007/s11277-007-9408-7


Jitter buffer plays an important role in Voice over IP (VoIP) applications because it provides a key mechanism for achieving good speech quality to meet technical and commercial requirements. The main objective of this paper is to propose a new, simple-to-use jitter buffer algorithm as a front-end to conventional static or adaptive jitter buffer algorithms to provide improved performance, in terms of enhanced user-perceived speech quality and reduced end-to-end delay. Supported by signal processing features, the new algorithm, the so-called Play Late Algorithm, alters the playout delay inside a speech talkspurt without introducing unnecessary extra end-to-end delay. The results show that the new algorithm achieves the best performance under different network conditions when compared to conventional static and adaptive jitter buffer algorithms. The results reported here are based on live tests and emulated network conditions on real mobile phone prototypes. The mobile phone prototypes use AMR codec and support full IP/UDP/RTP stack with IPSec function in some of the tests. The method for perceived speech quality measurement is based on the ITU-T standard for speech quality evaluation (PESQ).


Jitter bufferVoice over IPQuality of service (QoS)Perceived speech qualityPESQAMR codec
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© Springer Science+Business Media, LLC. 2007