2. Interactive Model Framework

Evaluating user perception of audiovisual interactive services like videotelephony in a reliable fashion calls for a well controlled testing environment and experimental test bed. The present chapter introduces the main aspects of the employed experimental method for studying the perception of audiovisual quality for videotelephony. In this work, a dedicated test bed was deployed that is composed of a controlled laboratory environment, a network infrastructure, a videotelephony client and a control unit. Audiovisual material specific to videotelephony (“head-and-shoulders”) was produced following specific conversational scenarios adapted to the evaluation of the interactive quality. This experimental setup was designed to facilitate the investigation of user experience in an interactive experimental context.