Spectrum Analysis of Enviromental Noise in Urban Districts
城市区域环境噪声频谱分析

This paper gives a detailed spectrum analysis on urban environment noise. From the analytical results, it can be seen that average octave-band sound levels of ambient noise are L10>Leq>K50>L90 and traffic noise level, industrial noise level and social noise level are A weighted sound levels.If ambient noise levels are substitute into different values (LOB-LA) between the octave-band sound level and A weighted sound level, it can be seen that the octave-band sound level relative to A weighted sound level LOB-L'A of industrial noise, traffic noise or social noise is as much as the same average spectrum distributive regularity, so that common relative octave-band sound level can be used steadfastly by changing A weighted ambient noise level into the octave-band sound level. This investigation have come to the above mentioned conclusion, we can use average relative octave sound level measured in 36, points or noise rating curvers (NR curvers) by changing A-wei-ghted ambient noise level into the Octave-band sound level, this transformation will keep certain precision.