NF F90-272-2-2013
铁路应用设施.轨道.对空气传声起作用的隔声板和相关设备.测定声学性能的试验方法.第2部分:内在特征.扩散声场条件下实验室中空气隔声
Railway applications - Track - Noise barriers and related devices acting on airborne sound propagation - Test method for determining the acoustic performance - Part 2: intrinsic characteristics - Airborne sound insulation in the laboratory under diffuse s