Comparing noise criteria comparing noise criteria noise criterion nc ncb rnc noise rating nr and dba decibel a b and c sound pressure sensed by the human ear dba dbb or dbc frequency filters effects of low frequency vibrations on buildings effects of low frequency vibrations on building constructions. Interest in the powerful effects of low frequency noise and vibration on people is widespread thus this work will appeal to researchers in disciplines as diverse as acoustics vibration psychology occupational health and environmental health it will also appeal to researchers in academia and designers of all kinds of industrial equipment in terms of its generation of low frequency sound and its effect on whole body vibration. Researchers have reported several hazardous impacts of low frequency noise on human health such as annoyance headache cityfatigue etc to attenuate low frequency sound many composite structures. A review of the effects of low frequency noise indicates that the effects are similar to those of higher frequency noise that noise in the 20 100 hz range is much more significant than infrasound at similar sound pressure levels and that the possible danger due to infrasound has been much over rated
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