Evaluation of the human voice for indications of workload-induced stress in the aviation environment
This report gives a literature review of stress analysis from the human voice. While a special focus is on workload-induced stress and the special treatment of the avionic environment, a general overview of the analysis of speech under stress using a broader definition of stress is given as well. We discuss definitions of stress and workload and point out the relation between stress and human speech. We provide a summary of useful speech databases for workload induced stress analysis. A discussion on speech signal features commonly used for stress analysis is the main part of this report.Research in the effect of workload-induced stress on speech signals has become a riveting issue recently, while it is still at an early stage. Current problems are the multitude of influence factors and the speaker dependence of the effects of stress on the speech signal.As speech has the advantage of being a medium naturally used in the air traffic control environment it seems to be worthwhile to further explore this approach on a long-term basis.NOTE: The methods discussed in this report are largely based on public available research literature. The ownership of the related intellectual property rights has not been determined in this literature study and should be sought directly from the authors of the publications cited in the 'references' sections.