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  • AS 1045-1988

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Acoustics - Measurement of sound absorption in a reverberation room

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  23-06-2021

    Language(s):  English

    Published date:  01-01-1988

    Publisher:  Standards Australia

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

    1 - AS 1045-1988 ACOUSTICS - MEASUREMENT OF SOUND ABSORPTION IN A REVERBERATION ROOM
    4 - PREFACE
    5 - CONTENTS
    6 - FOREWORD
    7 - SECTION 1. SCOPE AND GENERAL
    7 - 1.1 SCOPE.
    7 - 1.2 APPLICATION.
    7 - 1.3 PRINCIPLE OF THE METHOD.
    7 - 1.4 STANDARD DEVIATION OF MEASUREMENTS.
    7 - 1.5 REFERENCED DOCUMENTS.
    7 - 1.6 DEFINITIONS.
    7 - 1.6.1 Reverberation time
    7 - 1.6.2 Equivalent sound absorption area of a room
    7 - 1.6.3 Equivalent sound absorption area of a test specimen
    7 - 1.6.4 Sound absorption coefficient
    7 - 1.6.5 Repeatability standard deviation (s)
    7 - 1.6.6 Reproducibility standard deviation
    9 - SECTION 2. INSTRUMENTATION
    9 - 2.1 SIGNAL GENERATION.
    9 - 2.2 SOURCE FILTER OR SPECTRUM SHAPER.
    9 - 2.3 LOUDSPEAKERS.
    9 - 2.4 MICROPHONES.
    9 - 2.5 MEASURING FILTER.
    9 - 2.6 RECORDING EQUIPMENT.
    10 - SECTION 3. TEST ARRANGEMENT
    10 - 3.1 REVERBERATION ROOM AND DIFFUSION OF SOUND FIELD.
    10 - 3.1.1 Volume of reverberation room.
    10 - 3.1.2 Shape of reverberation room.
    10 - 3.1.3 Diffusion of sound field.
    10 - 3.1.4 Sound absorption area.
    10 - 3.2 TEST SPECIMEN.
    10 - 3.2.1 Planar absorbers.
    10 - 3.2.2 Discrete sound absorbers.
    11 - 3.2.3 Curtains.
    11 - 3.3 TEMPERATURE AND RELATIVE HUMIDITY.
    12 - SECTION 4. TEST PROCEDURE
    12 - 4.1 GENERATION OF SOUND FIELD.
    12 - 4.1.1 General.
    12 - 4.1.2 Signal spectrum.
    12 - 4.2 MEASUREMENT OF REVERBERATION TIME.
    12 - 4.2.1 Receiving equipment.
    12 - 4.2.2 Evaluation of decay curves.
    12 - 4.3 FREQUENCY RANGES FOR MEASUREMENTS.
    12 - 4.4 NUMBER OF MEASUREMENTS.
    14 - SECTION 5. EXPRESSION OF RESULTS AND TEST REPORT
    14 - 5.1 METHODS OF CALCULATION.
    15 - 5.2 STATEMENT OF RESULTS.
    15 - 5.3 TEST REPORT.
    16 - APPENDIX A - DIFFUSIVITY OF THE SOUND FIELD IN THE REVERBERATION ROOM
    16 - A1 DIFFUSERS.
    16 - A2 CHECK OF DIFFUSIVITY.
    17 - APPENDIX B - EXPECTED REPEATABILITY AND REPRODUCIBILITY STANDARD DEVIATIONS FOR ........
    17 - B1 REPEATABILITY STANDARD DEVIATION (sR)
    17 - B1.1 Theoretical prediction.
    18 - B1.2 Calculated example.
    19 - B2 REPRODUCIBILITY STANDARD DEVIATION (sR).
    19 - B3 REFERENCES.
    20 - APPENDIX C - CALCULATION OF AIR ATTENUATION COEFFICIENT

    Abstract - (Show below) - (Hide below)

    Sets out a method of measuring the sound of absorption coefficient of acoustical materials used as wall or ceiling treatments, of the equivalent sound absorption area of objects such as furniture, persons, or space absorbers, in a reverberation room. It is not intended for measuring the absorption characteristics of weakly damped resonators.

    Scope - (Show below) - (Hide below)

    This Standard sets out a method of measuring the sound absorption coefficient of acoustical materials used as wall or ceiling treatments, or the equivalent sound absorption area of objects such as furniture, persons, or space absorbers, in a reverberation room. It is not intended for measuring the absorption characteristics of weakly damped resonators.The results obtained, using the method outlined in this Standard, can be used for comparison purposes and for design calculation with respect to room acoustics and the reduction of the reverberant component of the sound field.

    General Product Information - (Show below) - (Hide below)

    Committee AV-004
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    AS 1633-1985 Acoustics - Glossary of terms and related symbols
    AS Z41-1969 Octave, half octave and one-third octave band pass filters intended for the analysis of sound and vibrations

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

    AS/NZS 1935.1:1998 Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes Method using standing wave ratio
    AS 1217.2-1985 Acoustics - Determination of sound power levels of noise sources Precision methods for broad-band sources in reverberation rooms
    AS 1191-2002 Acoustics - Method for laboratory measurement of airborne sound transmission insulation of building elements
    AS 2253-1979 Methods for field measurement of the reduction of airborne sound transmission in buildings
    AS 1217.5-1985 Acoustics - Determination of sound power levels of noise sources Engineering methods for free-field conditions over a reflecting plane
    AS/NZS 2499:2000 Acoustics - Measurements of sound insulation in buildings and of buildings elements - Laboratory measurement of room-to-room airborne sound insulation of a suspended ceiling with a plenum above it
    AS/NZS 4443:1997 Office panel systems - Workstations
    AS 1081.2-1990 Acoustics - Measurements of airborne noise emitted by rotating electrical machinery Survey method
    AS/NZS 2785:2000 Suspended ceilings - Design and installation
    AS 1217.4-1985 Acoustics - Determination of sound power levels of noise sources Engineering methods for special reverberation test room
    AS 1081.1-1990 Acoustics - Measurement of airborne noise emitted by rotating electrical machinery Engineering method for free–field conditions over a reflective plane
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