CEN/TS 1793-4 : 2003
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
ROAD TRAFFIC NOISE REDUCING DEVICES - TEST METHOD FOR DETERMINING THE ACOUSTIC PERFORMANCE - PART 4: INTRINSIC CHARACTERISTICS - IN SITU VALUES OF SOUND DIFFRACTION
03-01-2015
01-12-2013
Foreword
Introduction
1 Scope
2 Normative references
3 Definitions and symbols
3.1 Definitions
3.2 Symbols
4 Diffraction index difference measurements
4.1 General principle
4.2 Dimensions and specifications
4.3 Positions of the sound source
4.4 Position of the microphones
4.5 Free-field measurements
4.6 Measured quantity
4.7 Measuring equipment
4.8 Data processing
4.9 Positioning of the measuring equipment
4.10 Diffraction index difference
4.11 Single-number rating of diffraction index
difference DL[delta][DI]
4.12 Sample surface and meteorological conditions
4.13 Measuring procedure
4.14 Test report
Annex A (Informative) Definition and usage of the MLS
signal
Annex B (Informative) Indoor measurements for product
qualification
Annex C (Informative) Bibliography
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