Browse > Article

Optimization of the packet size to enhance the voice quality of the VOIP system  

임강빈 (순천향대학교 정보보호학과)
정기현 (아주대학교 전자공학과)
최경희 (아주대학교 정보통신전문대학원)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.40, no.9, 2003 , pp. 373-383 More about this Journal
Abstract
In this paper we discuss the effect of the delay limit and the packet size related to the quality of service on a VoIP system using the Internet. We also provide a guideline to determining the optimal packet size of the voice data for a given delay limit. Empirical studies are done with two personal computers connected through the packet switched public IP network. The sender encodes the voice signal from the microphone to get PCM and ADPCM data and sends the data to the receiver using UDP packets. The receiver plays the reconstructed voice from the stream with lost and delayed packets. The quality of the reconstructed voice is evaluated offline by the MNB (Measuring Normal Block) method using the data acquired from the both sides. The result shows that under the delay limit of 100ms for 40Kbps, 32Kbps and l6Kbps of ADPCM data, the minimum packet size should be 300bytes, 400bytes and 600bytes respectively and the maximum packet size should be l200bytes commonly for the best quality of voice.
Keywords
Internet; VoIP; Voice coding; Packet; Packet network;
Citations & Related Records
연도 인용수 순위
  • Reference
1 V. Hardman, M.A. Sasse, M. Handly and A.Watson, 'Reliable Audio for Use over the Internet', Proc. INET '95, pp.171-178,1995
2 B. Li and X.R. Cao, 'Experimental Results on the Impact of cell Delay Variation on Speech Quality in ATM Networks', Proc. of IEEE International conference on communications, 1998   DOI
3 M. Hausenstein, 'Application of Meddis' Hair-Cell Model to the Prediction of Subjective Speech Quality', Proc. of IEEE International Conference on Acoustics, Speech and Signal Processing, 1998   DOI
4 N.S. Jayant and S.W. Christensen, 'Effects of Packet Losses in Waveform Coded Speech and Improvements Due to Odd-Even Sample-Interpolation Procedure', IEEE Transactions on communications, COM-29: pp. 101-109, Feb. 1981
5 K.V. Chin, S.C. Hui and S. Foo, 'A Quallity-based Dynamic Voice Recovery Mechanism for Internet Telephony System', ASEAN Journal of Science and Technology for Development, 16(2), pp. 93-110, 1999
6 S.R. Quackbush, T.P. Barnwell and M.A. Clements, 'Objective Measures of speech Quality', Prentice-Hall, 1988
7 J.G. Beerends and J.A. Stenerdink, 'A Perceptual speech-Quality Measure Based on a Psychoacoustic Sound Representation,' Jounal of the Audio Engineering Society, Vol.42, No.3, 1994
8 John Aderson, 'Methods for Measuring Perceptual Speech Quality', Network systems Test Division, Agilent Technology, May 2001
9 O. Merton, 'Lucent/Avaya Pave the way for Voice Over IP Telephony', IT Pro, pp. 66-68, Jan/Feb. 2001   DOI
10 C.H.Slump, T.Simons and K. Verweij, 'On the objective speech quality of TETRA', STW/SAFE99, pp. 429, 421- Oct.1999
11 Stephen Voran, 'Objective Estimation of Perceived speech Quality', IEEE Transaction on speech and Audio Processing, Jul. 1999
12 Sebastian Moller, 'Assessment and Prediction of Speech Quality in Telecommunications', Kluwer Academic Publishers, 2000