Accession Number : ADA257835


Title :   NPSNET: Aural Cues for Virtual World Immersion


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Dahl, Leif A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257835.pdf


Report Date : Sep 1992


Pagination or Media Count : 75


Abstract : NPSNET is a low-cost visual and aural simulation system designed and implemented at the Naval Postgraduate School. NPSNET is an example of a virtual world simulation environment that incorporates real-time aural cues through software-hardware interaction. In the current implementation of NPSNET, a graphics workstation functions in the sound server role which involves sending and receiving networked sound message packets across a Local Area Network, composed of multiple graphics workstations. The network messages contain sound file identification information that is transmitted from the sound server across an RS-422 protocol communication line to a serial to Musical Instrument Digital Interface (MIDI) converter. The MIDI converter, in turn relays the sound byte to a sampler, an electronic recording and playback device. The sampler correlates the hexadecimal input to a specific note or stored sound and sends it as an audio signal to speakers via an amplifier. The realism of a simulation is improved by involving multiple participant senses and removing external distractions. This thesis describes the incorporation of sound as aural cues, and the enhancement they provide in the virtual simulation environment of NPSNET.


Descriptors :   *COMPUTER COMMUNICATIONS , *LOCAL AREA NETWORKS , *PACKETS , *CONVERTERS , *SAMPLERS , SIMULATORS , INPUT , REAL TIME , INTERFACES , THESES , IDENTIFICATION , RELAYS , PLAYBACK , AMPLIFIERS , EXTERNAL , COMPUTER GRAPHICS , SOUND , SIGNALS , TIME , AUGMENTATION , INTERACTIONS , LOW COSTS , FUNCTIONS , SIMULATION , ELECTRONICS


Subject Categories : Electrical and Electronic Equipment
      Recording and Playback Devices


Distribution Statement : APPROVED FOR PUBLIC RELEASE