This area is also indirectly related to the speech and video synthesis technologies, since high-resolution synthesis approaches imply efficient encoding, possibly at different resolution levels. Similarly, virtual environment research requires efficient storage and compression technologies for input and output. There are good reasons to believe, for example, that high-quality audio can be encoded at rates of 2,000 bps using dynamic adaptation of perceptual criteria in coding and articulatory modeling of the speech signal. Therefore, encoding research should include both generation and perceptual factors. Additionally, multimedia databases require techniques for providing temporal modeling and delivery capabilities.
Query scripts capture multimedia objects and their temporal relationships for presentation.
Thus, query scripts extend the database system's ability to select and define a set of objects for retrieval and delivery by providing a priori knowledge about client requests. This information allows the database system to schedule optimal access plans for delivering multimedia content objects to clients. Virtual environments relate to telepresence and telecommuting, as well as to personal communication services for digital voice. The technologies for telepresence and telecommuting involve a mixture of multimedia and networking. Wireless communication technology also includes techniques such as geopositioning measures, local indoor infrared sensors for location, communications technologies at low, medium, and high bandwidth, and so on.