The diversity of Interactive Digital Television (iTV) platforms has generated a diversity of languages, middlewares, technologies and authoring tools that do not facilitate the maintenance of the services across the exiting iTV devices and the business-tobusiness interchange (B2B). This paper presents a new architecture to unify the design of interactive TV (iTV) services across the multiple existing formats and devices. The proposed architecture is based on the DVB-PCF (Digital Video Broadcasting -Portable Content Format) standard. It enables the platform-independent iTV service description through the specification of the viewer's experience rather than its detailed implementation. This feature makes DVB-PCF a suitable format to be transcoded into any specific target platform format. However, this standard does not specify the scalability techniques to be used when mapping coordinates from the reference screen to the device display in cases where the resolutions differ. In this work we manage different service layouts through the automatic scaling of PCF documents and a later layout revision with the PCF Authoring tool. Furthermore, we present a PCF viewer tool to visualize and validate the generated and imported PCF services. Finally, as an example, we show the usage of a transcoder of PCF descriptions into a Web-based format. It allows the generation of the iTV applications optimized for a specific target platform.
Multimedia embedded systems require high performance specific computation to process the large among of data that characterizes the multimedia domain at low energy consumption due to battery life. Different optimizations at different levels can considerably improve performance and energy consumption and, after that, the address generation becomes the new performance bottleneck. This paper shows a custom-configurable address generation unit design which extends an application specific instruction set processor (ASIP) to boost the address calculations, improving performance and reducing the energy consumption around 27%. The main innovation of our work resides in a new custom-configurable AGU design which can be automatically implemented and directly connected to the ASIP data-path. This AGU design has a fast interface which allows reading one address in only one cycle and one instruction, and calculates new values without stopping the processor. The presented design can easily be implemented in broad range of ASIPs.
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