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From Single-Call to Multi-Call Quality: A Study on Long-Term Quality Integration in Audio-Visual Speech Communication

Speech quality is commonly assumed to be the most important factor for the quality of a speech communication service and solution. However, little is known about how the quality experienced during individual calls forms the quality perception of an entire service or solution. Taking the example of an audio-visual IP-based communication solution, a long-term study is presented in which we analyze this relationship in a controlled setting. Results show temporal integration effects in the users’ response to time-varying quality levels and prove that simple averaging of call quality scores does not provide sufficiently accurate estimations of service quality.