NPSNET-3D sound server: an effective use of the auditory channel
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Authors
Storms, Russell L.
Subjects
Advisors
Zyda, Michael J.
Falby, John S.
Date of Issue
1995-09
Date
September 1995
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The current MIDI-based sound system for the distributed virtual environment of NPSNET can only generate aural cues via free field format in two dimensions. To increase the effectiveness of the auditory channel in NPSNET, a sound system is needed which can generate aural cues via free field format in three dimensions. The approach taken was to build upon the current NPSNET sound system: NPSNET-PAS ROES94. Hardware limitations of NPSNET-PAS sound generating equipment were identified and more capable off the shelf sound equipment was procured. In software, a new algorithm was developed which properly distributes the total volume of a virtual sound source to a cube like configuration of eight loudspeakers. A second algorithm, based on the Precedence Effect, was also developed in an attempt to enhance one's ability to localize a sound source. Synthetic reverberation using digital signal processors was added to enhance perceptual distance of the generated aural cues. The result of this research is a MIDI-based free field sound system consisting of off the shelf' sound equipment and computer software capable of generating aural cues in three dimensions for use in NPSNET. This sound system was tested during numerous demonstrations of NPSNET and proved capable of generating eight independent audio channels required for potential output to a cube like configuration of eight loudspeakers laying the foundation for increasing one's level of immersion in NPSNET.
Type
Thesis
Description
Series/Report No
Department
Computer Science
Organization
Identifiers
NPS Report Number
Sponsors
Funder
NA
Format
172 p.
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.