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Estimation of the day-evening-night level, Lden, requires either measurements of the A-weighted short term average sound level, LAeq (road traffic noise), or measurements of the sound exposure level LAE (aircraft and train noise ). Four classes of meteorological conditions are considered. The random nature of noise emission and propagation is a source of error in Lden estimation. Standard deviation of the day-evening-night level, den, is proposed as a measure of this error.
Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.