Accession Number:

ADA454168

Title:

The Effect of Spectral Variation on Sound Localisation

Descriptive Note:

Research rept.

Corporate Author:

DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR OPERATIONS DIV

Report Date:

2006-03-01

Pagination or Media Count:

26.0

Abstract:

Previous research has suggested that spatialised auditory displays will enhance operator performance in many military settings. It is well known that a sounds spectrum must be broad and relatively flat for the sound to be accurately localised. The study described here examined the effect of systematically varying the evenness of a sounds spectrum on the accuracy with which the sound can be localised. Six participants localised spectrally scrambled sounds produced by setting the sound levels in the 98-, 391- or 1562-Hz wide frequency bands comprising a broadband 0-25 kHz sound to random values within a 0-, 20-, 40- or 60-dB range. Localisation errors were found to increase with increases in both bandwidth and band-level range. Scrambling the spectra of sounds over a 60 dB range led to as much as a doubling of mean elevation error and a trebling of frontback confusion rate. The accuracy with which these sounds could be localised was found to be highly correlated with a simple measure of spectral variation. The results of this study inform the development of guidelines for designing localisable sounds to be used in spatialised auditory displays.

Subject Categories:

  • Acoustics
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE