DIN EN 1793-4:2015-05

This European Standard describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of traffic noise reducing devices. The test method prescribes measurements of the sound pressure level at several reference points near the top edge of a noise reducing device with and without the added device installed on its top. The effectiveness of the added device is calculated as the difference between the measured values with and without the added devices, correcting for any change in height (the method described gives the acoustic benefit over a simple barrier of the same height; however, in practice the added device can raise the height and this could provide additional screening depending on the source and receiver positions). The committee responsible for this standard is NA 005-10-26 AA "Lärmschutzvorrichtungen (SpA zu CEN/TC 226/WG 6), Gemeinschaftsausschuss mit FGSV" ("Noise reducing devices (national mirror committee for CEN/TC 226/WG 6) Joint working group with FGSV") at DIN.