This paper deals with the measurement uncertainty of the speech quality (SQ) achievable by an actual voice-over-Internet-protocol (VoIP) telephony network. The accuracy of end-to-end speech data provided by the perceptual estimation of SQ (PESQ) algorithm suggested in the International Telecommunication Union (ITU) recommendation P.862 is discussed. Then, the uncertainty of the PESQ results under different measurement conditions and real-life VoIP equipment (media gateway) is analyzed. This problem, in fact, has received very little attention in the literature, although many results related to other kinds of PESQ applications are available. Meaningful experimental data are reported and discussed mainly by means of statistical tools.
[1]
A. W. Rix,et al.
Quality VoIP — An Engineering Challenge
,
2001
.
[2]
ITU-T Rec. P.862.3 (11/2007) Application guide for objective quality measurement based on Recommendations P.862, P.862.1 and P.862.2
,
2008
.
[3]
James J. Filliben,et al.
NIST/SEMATECH e-Handbook of Statistical Methods; Chapter 1: Exploratory Data Analysis
,
2003
.
[4]
Akira Takahashi,et al.
Objective Assessment Methodology for Estimating Conversational Quality in VoIP
,
2006,
IEEE Transactions on Audio, Speech, and Language Processing.
[5]
Zhuoqun Sun,et al.
Voice quality prediction models and their application in VoIP networks
,
2006,
IEEE Transactions on Multimedia.
[6]
Methods for objective and subjective assessment of quality Perceptual evaluation of speech quality ( PESQ ) : An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs
,
2002
.
[7]
Antony William Rix,et al.
Perceptual evaluation of speech quality (PESQ): The new ITU standard for end-to-end speech quality a
,
2002
.
[8]
Sebastian Möller,et al.
Assessment and Prediction of Speech Quality in Telecommunications
,
2000
.