The direct effects of sound energy on human hearing are well established and accepted but previous research about
the effects of noise exposure on medical parameters has been carried out mainly under laboratory conditions. Such
test arrangements are not representative of the real impacts on humans, especially at night during sleep phases.
The two main objectives of this proposal are to investigate the influence of road and rail traffic noise on human
sleep patterns and additionally to explore the relationship of subjective perception of test subjects with objective
measured psychoacoustic and physiological parameters. The crucial point of the proposal is that all measurements
will be done in the free field with real-life situations. Based on past experiences of the Graz University of
Technology with acoustical measurement techniques in free field areas a standardized method for objective
acoustical measurements in residential environments of test subjects will be developed. The goal of acoustical
measurements is to achieve a time-synchronicity between the results of the electronic questionnaire (traffic noise
annoyance-rating, experiences, feelings and behaviour) and acoustical parameters including sound pressure level
and psychoacoustics reflecting the total quantity and quality of the test subject's acoustic exposure.