NF F90-272-3-1-2012
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3-1部分:扩散场应用的标准铁路噪声谱和单数评定
Railway applications - Track - Noise barriers and related devices acting on airborne sound propagation - Test method for determining the acoustic performance - Part 3-1 : normalized railway noise spectrum and single number ratings for diffuse field applic