3-D audio has been suggested as a way to augment communication and provide unique services in future mobile networks. This paper presents some concepts for the use of 3-D audio communications services, which could be implemented in future mobile networks. In order to demonstrate these concepts, a prototype wireless, 3-D audio system, has been built, and evaluated. The system realizes a wireless multi-user virtual 3-D audio communication space, overlaid on the actual space the user inhabits. The system tracks the user's position and head orientation. It was confirmed that the head tracking and motion feedback helps in greatly improving localization accuracy. 3-D audio processing is a very promising technology that will allow mobile communications systems to evolve from simple voice communications to rich multimedia-multidimensional services.
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