Accession Number : ADA318844

Title :   Headphone-Delivered Three Dimensional Sound in NPSNET.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Biggs, Lloyd J.

PDF Url : ADA318844

Report Date : SEP 1996

Pagination or Media Count : 141

Abstract : The current MIDI-based sound system for the distributed virtual environment of NPSNET can only generate aural cues via loudspeaker delivery in two dimensions. To further increase the sense of immersion experienced in NPSNET, a sound system is needed which can generate aural cues via headphone delivery in three dimensions. The approach taken was to explore the different feasible methods of rendering and presenting headphone-delivered spatial sound. One alternative was to implement a sound server capable of the real-time rendering of three dimensional sounds. Another alternative was to create a library of pre-recorded positioned sound files. In software, new algorithms were developed to integrate the sound server into NPSNET and to provide a table lookup capability for NPSNET's new spatial sound file library. The result of this research is a sound server capable of rendering up to twenty-four simultaneous sounds for a single participant in NPSNET using off-the-shelf sound equipment and computer software. This sound server was tested during numerous demonstrations of NPSNET. This research provided another method of increasing a participant's level of immersion in NPSNET through the use of aural cues.

Descriptors :   *ACOUSTIC SIGNALS, *VIRTUAL REALITY, *PSYCHOACOUSTICS, *DISTRIBUTED INTERACTIVE SIMULATION, DATA BASES, ALGORITHMS, SOFTWARE ENGINEERING, COMPUTER COMMUNICATIONS, REAL TIME, OFF THE SHELF EQUIPMENT, THESES, THREE DIMENSIONAL, INTERACTIVE GRAPHICS, COMPUTER NETWORKS, ACOUSTIC DATA, ACOUSTIC FIELDS, SOUND ANALYZERS, AUDIO TONES, EARPHONES, CUES(STIMULI).

Subject Categories : Computer Programming and Software
      Acoustics
      Computer Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE