Phantom Sources for Separation of Listening and Viewing Positions of Multipresent Avatars in Narrowcasting Collaborative Virtual Environments

Authors:
Owen Noel Newton Fernando;Kazuya Adachi;Michael Cohen
Affiliations:
-;-;-
Venue:
ICDCSW '04 Proceedings of the 24th International Conference on Distributed Computing Systems Workshops - W7: EC (ICDCSW'04) - Volume 7
Year:
2004

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Abstract

Our group is exploring interactive multimedia, especiallyfor virtual and mixed reality groupware systems. Theapparent paradoxes of multipresence, having avatars inmultiple places or spaces simultaneously, are resolvable byan "autofocus" feature, which uses reciprocity, logical exchangabilityof source and sink, to project overlaid soundscapesand simulate precedence effect to consolidate the audiodisplay.This paper reviews an interface to control source驴sinktransmissions in synchronous groupware (like teleconferences,chatspaces, virtual concerts, etc.), supporting spatialaudio multipresence with narrowcasting functions in acollaborative virtual environment, implemented in a Java3Dapplication, "Multiplicity." The interface allows interactationwith other clients in our groupware suite (includingmobile phone, stereographic panoramic browser, and multispeakersystems). "Phantom sources" are used to controlsuperposition of soundscapes relative to a selected viewpoint.Relative displacement from sources驴sinks can beused to display phantom sources from alternate locations,exocentrically visibly and endocentrically auditorilly. A extrafeature of the phantom source displacement is the accommodationof a rotatable speaker axis (including medianplane arrangement).