Non-intrusive speech quality assessment in simplified e-model

Abstract

The E-model brings a modern approach to the computation of estimated quality, allowing for easy implementation. One of its advantages is that it can be applied in real time. The method is based on a mathematical computation model evaluating transmission path impairments influencing speech signal, especially delays and packet losses. These parameters, common in an IP network, can affect speech quality dramatically. The paper deals with a proposal for a simplified E-model and its practical implementation into the Monitoring module. In order to enable the comparison of results achieved, PESQ (Perceptual Evaluation of Speech Quality) was applied in accordance with ITU-T recommendation P.862, nowadays regarded as the standard for determining MOS, the measurements confirmed the applicability of the proposed method and its suitability for speech quality assessment.