Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In-situ values of sound diffraction; German version CEN/TS 1793-4:2003— 31 стр.
Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction— 35 стр.
Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction— 35 стр.