General classification scheme for outdoor sound propagation situations

摘要

Noise assessment normally considers a long term average energy equivalent sound pressure level (Leq) and a maximum level (Lmax) to indicate the noise situation for correlation with noise impairment, e. g. annoyance. Acoustical time and frequency weightings applied to these levels are said to take into account the sensitivity of human hearing. In addition, level adjustments are added to correct the levels for particular sound specific reception impairment potential and to make the rating levels comparable to single numbered noise limits. This concept is found throughout many national and local regulations.