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Abstract:
Previous research has suggested that spatialised auditory displays will enhance operator performance in many military settings. It is well known that a sound's 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 sound's 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 front/back 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.
| Description: |
Research rept. |
| Pages: |
25 |
| Report Date: |
MAR 2006 |
| Report Number: |
A868154 |
Report Unavailable |
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