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Real-time audio and video transmission over shared packet networks, such as the Internet, has become possible thanks to efficient data compression schemes and the provision of high-speed networks. Low-cost multimedia conferencing technology could benefit many users in different areas, such as remote collaboration, distance education and health-care. It is likely that diverse tasks performed by users in different application domains will require different levels of audio and video quality. Established methods of rating audio and video quality in the broadcast and telephony world cannot be applied to digital, lower quality images and sound. The providers of networks and services are looking to HCI to provide a means of assessing audio and video quality. The paper describes two different approaches to assessing audio and video of desktop conferencing systems - a controlled experimental study and an informal field trial. The advantages and disadvantages of both approaches for providing task-specific quality assessment are discussed, and future work to integrate lab-based and field trials into a valid and reliable assessment approach is outlined.
Watson et al. (Fri,) studied this question.