SESSION 4: CREATING SPACE WITH DSP 3-D Audio Communications Services for Future Mobile Networks Yasuyo Yasuda 1 , Tomoyuki Ohya 1 , David McGrath 2 and Patrick Flanagan 2 1 Multimedia Laboratories, NTT DoCoMo, Inc., Yokosuka, Kanagawa, Japan 2 Lake Technology Ltd., Ultimo, NSW, Australia 3-D audio has been suggested as a way to augment communication and provide unique services in future mobile networks. Concepts of the services 3-D audio can provide are presented. For concept demonstration, a prototype wireless 3-D audio system, the Tohya system, has been built and evaluated. Tohya realizes a wireless multiuser virtual 3-D audio communication space, overlaid on the actual space the user inhabits. Each user of Tohya is equipped with a microphone, headphone, and a PDA with wireless networking. The Tohya system tracks the user�s position and head orientation. Users communicate with other remote users in an overlaid (augmented) 3-D audio space. 3-D audio processing should allow mobile communications systems to evolve from voice communications to rich multimedia-multidimensional services.