Comparison between the spectrum shape of traffic noise in Belgrade and the ISO 717-1 reference spectrum

摘要

ISO 717-1 standard defines a reference traffic noise spectrum used for the calculation of traffic noise spectrum adaptation term (C_(tr)). The latter one is then added to the single number sound insulation descriptors in order to quantify the protection against this type of noise more accurately. However, traffic noise and its spectral content depend on many factors and are expected to show strong variations in real circumstances, making the appropriateness of the reference spectrum arguable in some cases. The aim of this paper is, therefore, to compare the measured spectra of the traffic noise in Belgrade and the ISO 717-1 reference spectrum. Noise recordings were made at various locations in the city's urban area and then statistically analysed. The results should also point to some noise characteristics which can influence the spectrum shape variations and can cause large deviations from the reference spectrum.