Abstract
In parallel to the ultrasonic noise assessment procedures and research
activity in the field there have appeared several papers in the domain of
so called high-frequency audiometry which covers the range of frequencies
8-20 kHz. They are important for recognizing the harmfulness and hazard of
the audible high frequency sound components in the same range as the one
of the low frequency ultrasonic noise. On the other hand there exists a
certain inconsequent situation in the general approach to the problem of
ultrasonic noise hazard assessment in work places environment which
concerns the convention to include the frequency range of 10-20 kHz to the
domain of ultrasonics. The range consists of one third octave bands of
central frequencies: 10, 12.5, 16, 20 kHz and conventionally is called low
frequency ultrasonic noise though at least the components of the two
lowest bands are naturally audible by a majority of population (mainly
young people).The paper presents a discussion related to some achievements
of the two domains and some conclusions which could be useful for a more
consequent description of the subject and could be taken into account in
the future regulations for the ultrasonic noise assessment in work places
environment.
Go to article