3D sound in the helicopter environment: localisation performance
Resumé
At IRBA, we are carrying out studies into acoustic protection and enhancement of the audio performances of combat helicopter pilots. As part of this work, we present here the results of a laboratory study concerning the localisation of spatialized sound sources using head mounted equipment ( ight helmet and customized wireless ear plugs). The study involved 11 participants. Participant pointed out at the perceived position of an onboard alarm using a plastic sphere representing the proximal auditory space. Two factors were tested: silence versus helicopter type noise and individualized HRTF versus non individualized ones. Each subject ful lled all the conditions, i.e. took part in all 4 sessions. In each session 45 positions were tested randomly 3 times each. Before recording the results, a procedural training was followed by the participants concerning the pointing task and the localisation task. Following correction of front/rear inversions, the mean centroid aiming point error for all positions taken together, was of the order of 35° (standard deviation about 20°). With customized HRTF, the subjects achieved better performances both silence and noise conditions (difference of 4°).
Referencer
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