Outdoor and Indoor Sound Propagation in a Variety of Temperature and Surface Type

Abstract

Sound propagation can occur in the indoor and outdoor. The sound propagation patterns that occurring inside and outside the room is different because of different components in it. Among them are variations of meteorological conditions such as temperature and wind, the sound absorption by the topography, climate and type of surface, and obstructions such as buildings and crops. Based on these explanations, there are components of the type of surface and air temperature variations that can affect the sound propagation patterns. So, the research which involving both components was done. The purpose of this study is to determine the relevance of the distribution of votes because of differences in surface temperature and air and noise in the model describes the distribution of scale (indoor) and the actual conditions (outdoor) with differences in air temperature and type of existing surface. Based on the purpose of this study, the parameters used are air temperature and type of surface. The method used in this research is Inverse Square Law. Beside that, it is also the filtering frequency was done using 1/3 octave. Based on the measurements, the result is not all the factors of air temperature significantly affects the sound pressure level outside the room. Only in a few frequencies, that is at a frequency of 63, 80, 100, 160, 315, 630, 800, 1000 (Hz). However, for all type of surfaces factors in all the frequency that have been classified was significantly affects the sound pressure level. So in other words, the sound pressure level received at the outdoor conditions depending on the type of surface where the sound source is located. Another case of the measurement results obtained in the room. After the measurement the result showed that the factor temperature significantly affect the sound level at all frequencies results classification.