Annoyance, quality- and safety aspects of sound in truck cabins
For heavy vehicles the interior sound environment is still more or less just a
passive result of the engineering of the different parts that make up the vehicle,
although measures are taken to keep sound pressure level within legislated
boundaries. Additionally, the sound inside truck cabins is dominated by its
low frequency (LF) content, and is hence prone to impair task performance and
reduce wakefulness as well as cause general annoyance and different adverse
health effects. In this report, four aims have been formulated in order to by use
of a sound quality approach investigate possibilities to increase safety aspects
of the sound environment, enhance positive and reduce negative subjective
Understanding experience of and reaction to a sound environment such
as the one in a truck cabin, with special focus on the prevailing high
levels of low frequency content.
Understanding the relation between perceived negative and positive aspects
of such a sound environment.
Investigate perceptually adequate ways of describing the sound environment,
in addition to the for this context inferior traditional methods such
as A-weighted sound pressure levels.
Investigate influence from physical properties of the sound environment,
compared to influence from the information that is conveyed by the
Three dimensions were found to be of great importance for the assessment of
interior truck sound: Annoyance, Quality and Wakefulness. Additionally it
was found that reducing some negative aspects along the annoyance dimension
also reduced some positive aspects along the quality dimension, indicating
the need for a careful optimization between these dimensions. Importance of
high frequency content for perception of differences in the low frequency region
showed the use of spectral balance as a descriptor of interior heavy vehicle
sound. Also, information content showed to mediate annoyance and affective
responses to interior truck sound.
product sound quality