engleski

Design and Evaluation of a Multi-User Virtual Audio Chat

In the area of advanced Internet services, multi-user distributed virtual reality applications with integrated multimedia components may be foreseen as having tremendous market potential. Such services impose certain Quality of Service (QoS) requirements, due to rich multimedia content and perceived "real-time" interactivity. Specifying these requirements calls for different representations of QoS at the user/application level and at the communication level. Namely, while a user evaluates service performance in subjective and qualitative terms, communication level QoS is expressed in objective and quantifiable terms. Research in this area has progressed in two complementary directions, one addressing VR system performance, and the other addressing communication requirements. Our approach attempts to relate user/application level QoS characteristics with measurable application and communication parameters, using as a reference an interconnection model for distributed virtual reality applications. In this paper we present the design and development of a multi?user virtual audio chat application and a performance evaluation based on QoS requirements. Objective and subjective methods for determining QoS have been addressed, and our results analyzed for the purpose of possible QoS improvements.

quality of service; perceived quality; audio chat; virtual reality; streaming

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