Accession Number : ADA621862


Title :   Auditory Perception in an Open Space: Detection and Recognition


Descriptive Note : Final rept. Jul-Aug 2001


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD HUMAN RESEARCH AND ENGINEERING DIRECTORATE


Personal Author(s) : Fluitt, Kim F ; Mermagen, Timothy J ; Letowski, Szymon ; Letowski, Tomasz


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a621862.pdf


Report Date : Jun 2015


Pagination or Media Count : 66


Abstract : The purpose of the current study was to investigate the effects of distance and meteorological conditions on detection and recognition of, and distance estimation to, various sound sources spread across a large open field. This report presents results of the detection and recognition tasks. Both acoustic (target sound and noise level) and meteorological (wind direction and strength, temperature, atmospheric pressure, humidity) data were collected for each experimental trial. Twenty-four subjects participated in this study. Eight various sounds delivered from 6 test loudspeakers were presented to the listeners. The results indicate that in most cases as soon as a sound is detected, it is recognized. In most cases both the detection and recognition of sound sources declined rapidly at distances greater than approximately 100-200 m. The main effects of weather conditions and environmental noise are strongly correlated. Some expectations of sound propagation were not observed during data collection; specifically, sounds were more easily heard in the afternoon as opposed to the morning, which meant that participants detected and recognized sounds more accurately in the afternoon than in the morning. This was most likely attributed to the varying effects of temperature, humidity, and background noise in relatively very hot listening conditions. However, the overall performance of participants was very close to the results predicted by in-house software that modeled human detection of sounds.


Descriptors :   *ACOUSTIC DETECTION , *AUDITORY PERCEPTION , *HEARING , *METEOROLOGICAL DATA , *NOISE(SOUND) , ATMOSPHERIC SOUNDING , BACKGROUND NOISE , BAROMETRIC PRESSURE , COMPUTER PROGRAMS , CORRELATION , DATA ACQUISITION , EXPERIMENTAL DESIGN , HIGH TEMPERATURE , RANGE(DISTANCE) , RECOGNITION , SOFTWARE TOOLS , SOUND TRANSMISSION , STRENGTH(GENERAL) , TEMPERATURE , WAVE PROPAGATION , WIND DIRECTION


Subject Categories : Atmospheric Physics
      Anatomy and Physiology
      Acoustics
      Human Factors Engineering & Man Machine System


Distribution Statement : APPROVED FOR PUBLIC RELEASE