Free field spatialized aural cues for synthetic environments
Roesli, John T.
Zyda, Michael J.
Falby, John S.
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Commercially available spatial audio systems for synthetic environments suffer from excessive cost ~md the requirement for in-house application software development. The purpose of this work wru; to develop a low cost audio hardware and software system capable of generating aural cues for a synthetic environment in real-time, which correctly reflects the user's location and accurately conveys the type and location of the sound event. The approach taken wru; to first implement a software communication package using DIS (Distributed lnterdCtive Simulation protocol. a Department of Defense standard) to retrieve infonnation from the virtual world. The second step was to develop algorithms ~md software to process that information ~md model the physical sound world. Finally, ~m audio hardware system capable of generating the required audio cues in real-time was constructed. The result of this work is a system consisting of software and audio hardware for generating spatial aural cues that correctly localize a sound event for users in a virtual world. The system makes use of .. off-the-shelf' audio hardware (MIDI capable smnpler. amplifiers, <Uld speakers) which reduces the cost from $20.000 to less than $5.000. With minor modifications for MIDI port access and graphics library function calls. the software c~m be utilized on any computer that reads DIS packets from the networlc <md writes MIDI data to a data port.
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