DIN CEN/TS 16272-5 PDF

Railway applications – Track – Noise barriers and related devices acting on airborne sound propagation – Test method for determining the acoustic performance – Part 5: Intrinsic characteristics – In situ values of sound reflection under direct sound field conditions; German version CEN/TS 16272-5:20
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/2014