Summary

Recommendation ITU-T P.1302 describes a subjective method for assessing the quality of simulated speech or audio-visual telephony calls with time-varying transmission conditions. Simulated calls consist of several stretches of speech or audio-visual material which are ordered in a logical sequence, according to a storyline defined by a scenario. After each stretch, test participants have to answer a content-related question, and they have to rate the overall quality of the call at the end of the entire sequence. The method is meant as a complement to standard listening-only or conversational tests, provoking a fixed structure in the material to be judged, while maintain a more-or-less conversational attention focus of the test participants.