Processing of long‐term acoustic measurements

Many standards and European directives relative to noise are used to assess an acoustic situation, based on long‐term indicators such as Lday, Lnight or Levening. These indicators are defined mainly as the mean yearly equivalent acoustic level on a particular part of the day. Acoustic measurements are performed on reference periods representative of the typical acoustic situation. An Oper@ monitoring system performed measurements for two years on several points. An acoustic database of the one‐second integration time measurement was created. Different kinds of calculations were performed on these data, the variant being the measurement time considered. This study evaluates the convergence of the classic equivalent level with these long‐term indicators.