Quantifying the Suitability of Reference Signals for the PESQ Algorithm

IP networks are indispensable nowadays. They are among the most efficient platforms. The constantly growing number of users and new services in these nets – the largest representative being the Internet – requires a good quality of any application used. The determination of the QoS in the real-time services is particularly important. This paper is dedicated to exactly this aspect of the real-time service VoIP. It will show in a quantitative way which role the selected reference file plays in the determination of the QoS using signal-based methods. As a primary representative of these measuring methods the PESQ algorithm (ITU-T P.862) will be examined in more detail below. The investigations that have already been carried out in the context of this work into the capabilities of the various reference files available for the PESQ algorithm offer decision guidance for the selection of suitable reference signals. In addition this paper contains sound advice on the execution of QoS measurements over a longer period of time.