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The objective of this research is to enhance the delivery of multimedia content to mobile devices. Rich, immersive and portable multimedia is a much-needed feature that both industry and academia are pursuing. In order to achieve this objective, a number of problems need to be studied, understood and solved. First of all, a key aspect of portable devices is that they are lightweight and they have – compared to a desktop PC – limited computational power, memory and bandwidth. Moreover, their graphics/display and audio rendering capabilities are also – compared to home video-audio equipment – limited. Finally, but equally importantly, these devices cannot be too expensive. These constraints limit the range of current multimedia technologies that can be applied to the mobile world. An important aim of this project is to design, test and integrate novel, computationally efficient techniques that will present high-quality audio and video in portable devices, in a way to maximise the quality perceived by the user. At the same time, mobile devices can offer a feature that home-theatre environments cannot offer: they combine some kind of location-aware capability that, together with the use of a return-channel (typically offered by a cellular-network operator), allows the content to be customised and to be presented in an interactive manner.