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BS EN 1793-6:2025 Road traffic noise reducing devices. Test method for determining the acoustic performance - Intrinsic characteristics. Airborne sound insulation under direct sound field conditions >
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BS EN 1793-6:2025 Road traffic noise reducing devices. Test method for determining the acoustic performance - Intrinsic characteristics. Airborne sound insulation under direct sound field conditions, 2026
- undefined
- European foreword
- Introduction
- Figure 1 — Sketch of the reverberant condition check in four cases
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- Figure 2 — Sketch of the loudspeaker and the microphone grid close to a vertical road traffic noise reducing device under test for sound insulation index measurements (not to scale)
- Figure 3 — Measurement grid for sound insulation index measurements in front of a vertical road traffic noise reducing device (sound source side)
- Figure 4 — Sketch of the set-up for the reference “free-field” sound measurement for the determination of the sound insulation index
- 4 Symbols and abbreviations
- Table 1 — Symbols and abbreviations
- 5 Sound insulation index measurements [Go to Page]
- Figure 5 — Sketch of the minimum dimensions of full-size test specimens purposely built for testing
- Figure 6 — Sketch of the set-up for the sound insulation index measurement on a vertical flat road traffic noise reducing device (side view)
- Figure 7 — Sketches of the set-up for the sound insulation index measurement on inclined road traffic noise reducing devices (side view)
- Figure 8 — Sketches of the set-up for the sound insulation index measurement on curve road traffic noise reducing devices (side view) [Go to Page]
- Figure 9 — Sketch representing the essential components of the measuring system [Go to Page]
- Figure 10 — The Adrienne temporal window [Go to Page]
- Figure 11 — Example of application of the Adrienne temporal window to the transmitted component of an impulse response [Go to Page]
- Figure 12 — Low-frequency limit fmin of sound insulation index measurements as a function of the height of the road traffic noise reducing device under test, under the conditions specified in 5.5.6 [Go to Page]
- 6 Measurement uncertainty
- 7 Measuring procedure
- 8 Test report
- Annex A (informative) Low-frequency limit and window width
- Figure A.1 — Fourier transform of the Adrienne window having a width of 7,9 ms
- Figure A.2 — Low-frequency limit of the Adrienne window as a function of the window width
- Table A.1 — Low-frequency limit, rounded to the nearest integer, of the Adrienne window as a function of the window width
- Annex B (normative) Measurement uncertainty
- B.1 General
- B.2 Measurement uncertainty based upon reproducibility data
- B.3 Standard deviation of repeatability and reproducibility of the sound insulation index
- Table B.1 — Standard deviation of repeatability and reproducibility of the sound insulation index, for measurements across the acoustic elements, after the QUIESST project [17–19]
- Table B.2 — Standard deviation of repeatability and reproducibility of the sound insulation index, for measurements across the posts, after the QUIESST project [17–19]
- Annex C (normative) Template of test report on airborne sound insulation of road traffic noise reducing devices
- C.1 General
- Table C.1 — Template of test report on airborne sound insulation of road traffic noise reducing devices
- C.2 Test setup (example)
- Figure C.1 — General view of the test barrier (from front (traffic) side)
- Figure C.2 — Test arrangement showing loudspeaker and microphone array when measuring across the acoustic element
- C.3 Test object and test situation (example)
- Figure C.3 — Basic composition of the single elements of the noise barrier
- Figure C.4 — Cross-sections through noise barrier
- C.4 Results (example)
- C.4.1 Part 1 – Results for ‘element’ in tabular form
- Table C.2 — Template of tabular presentation of the results for the acoustic elements
- C.4.2 Part 2 – Results for ‘element’ in graphic form
- Figure C.5 — Results for 'element' in graphic form
- C.4.3 Part 3 – Results for ‘post’ in tabular form
- Table C.3— template of tabular presentation of the results at post
- C.4.4 Part 4 – Results for ‘post’ in graphic form
- Figure C.6 — Results for ‘post’ in graphic form
- C.5 Uncertainty (example)
- Table C.4 — Estimation of the uncertainty of the declared values of SI for “elements”
- Table C.5 — Estimation of the uncertainty of the declared values of SI for “posts”
- Table C.6 — Estimation of the uncertainty of the declared values of SI for “global”
- Annex D (normative) Indoor measurements for product qualification
- D.1 General
- D.2 Parasitic reflections
- Figure D.1 — Clearance zone, shaded in light grey, around a device under test (side view)
- D.3 Reverberation time of the room
- Bibliography [Go to Page]