DIN EN 1793-2 E:2017-02
道路交通减噪设备 测定声学性能的试验方法 第2部分:扩散声场条件下气载声音隔音的本质特征(草案)
Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 2: Intrinsic characteristics of airborne sound insulation under diffuse sound field conditions