Exocentric Control of Audio Imaging in Binaural Telecommunication

Michael COHEN  Nobuo KOIZUMI  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E75-A   No.2   pp.164-170
Publication Date: 1992/02/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Fundamentals of Next Generation Human Interface)
Category: 
Keyword: 
audio windows,  CSCW,  groupware,  sound field control,  teleconferencing,  

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Summary: 
Sound field telecommunication describes a voice communication system, intended to implement a virtual meeting, in which participants at distant sites experience the sensation of sharing a single room for conversation. Binaural synthesis reconstructs the sound propagation pattern of a particular room or environment in the vicinity of each ear, which seems appropriate for a personal multimedia environment. Localization cues in spatial hearing comprise both the sink's transfer function and source attenuation. Sink directional cues are captured by binaural head related transfer functions (HRTFs). Source attenuation is modeled as a frequency-independent function of the direction, dispersion, and distance of the source, capturing sensitivity, amplification, and mutual position. Audio windows, aural analogues of video windows, can be thought of as a user interface to binaural sound presentation for a teleconferencing system. Exocentric representation of audio window entities allows manipulation of all teleconferees in a projected egalitarian medium. We are implementing a system that combines dynamically selected HRTFs with dynamically determined source and sink position, azimuth, focus, and size parameters, controlled via iconic manipulation in a graphical window. With such an interface, users may arrange a virtual conference environment, steering the virtual positions of teleconferees.