NF F90-272-1-2013
轨道交通.轨道. 作用于空气传声的隔音屏障及相关设备. 测定声学性能的试验方法. 第1部分: 本质特征. 扩散声场条件下实验室内的吸音作用
Railway applications - Track - Noise barriers and related devices acting on airborne sound propagation - Test method for determining the acoustic performance - Part 1: intrinsic characteristics - Sound absorption in the laboratory under diffuse sound fiel