1 research outputs found
E-model modification for case of cascade codecs arrangement
Speech quality assessment is one of the key matters of
voice services and every provider should ensure adequate connection
quality to end users. Speech quality has to be measured by a trusted
method and results have to correlate with intelligibility and clarity of
the speech, as perceived by the listener. It can be achieved by
subjective methods but in real life we must rely on objective
measurements based on reliable models. One of them is E-model that
we can consider as mainly adopted method in IP telephony. This
method is based on evaluation of transmission path impairments
influencing speech signal, especially delays and packet losses. These
parameters which are common in IP network can affect dramatically
speech quality. In this article, a new modification of E-model, that
takes into consideration the cascade codecs arrangement, is
presented. The proposed a correction function improves the current
computational non-intrusive approach that is described in
recommendation ITU-T G.107, so-called E-model.Scopus551447143