DIN EN 1793-4-2015 道路交通噪声降低装置.声学性能测定的试验方法.第4部分:固有特征.声音衍射的现场测定值;德文版本EN 1793-4-2015
Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction; German version EN 1793-4:2015