Abstract
The effects of a spatial audio display on speech intelligibility were evaluated in a simulated Airborne Warning and Control System (AWACS) task environment. Ten trained Air Weapons Officers served as participants during a Close Air Support mission. Spatial audio, chatter level, and mission phase served as experimental factors and speech intelligibility was assessed using the Coordinate Response Measure. Results indicated that speech intelligibility was degraded during the most difficult mission segments, and that spatial audio alleviated, to a moderate extent, the degree of this degradation. In addition, spatial audio was associated with faster response times for correct identification of critical call signs. Overall ratings of perceived mental workload (NASA Task Load Index) indicated intermediate levels and failed to show an effect for the spatial audio manipulation. However, post-experimental questionnaires indicated that operators rated spatial audio technology as valuable for improving communications effectiveness. Accordingly, the present study is an important step in the transition of a mature interface technology that may significantly enhance critical communications in complex command and control environments.
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