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    I.S. CEN TS 1793-4:2004

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    ROAD TRAFFIC NOISE REDUCING DEVICES - TEST METHOD FOR DETERMINING THE ACOUSTIC PERFORMANCE - PART 4: INTRINSIC CHARACTERISTICS - IN SITU VALUES OF SOUND DIFFRACTION

    Available format(s):  Hardcopy, PDF

    Superseded date:  06-04-2015

    Language(s):  English

    Published date:  01-01-2004

    Publisher:  National Standards Authority of Ireland

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    Table of Contents - (Show below) - (Hide below)

    Foreword
    Introduction
    1 Scope
    2 Normative references
    3 Definition 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 Measurement 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

    Abstract - (Show below) - (Hide below)

    Describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of traffic noise reducing devices.

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    Document Type Standard
    Publisher National Standards Authority of Ireland
    Status Superseded
    Superseded By

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 13472-1:2002 Acoustics Measurement of sound absorption properties of road surfaces in situ Part 1: Extended surface method
    EN 1793-3:1997 Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 3: Normalized traffic noise spectrum
    EN 60651:1994/A2:2001 SOUND LEVEL METERS (IEC 60651:1979/A2:2000)
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