AS 1191-1985

1 - AS 1191-1985 ACOUSTICS - METHOD FOR LABORATORY MEASUREMENT OF AIRBORNE SOUND TRANSMISSION LOSS OF BUILDING PARTITIONS
4 - PREFACE
4 - CONTENTS
5 - SECTION 1. SCOPE AND GENERAL
5 - 1.1 SCOPE
5 - 1.2 APPLICATION
5 - 1.3 REFERENCED DOCUMENTS.
5 - 1.4 GENERAL DESCRIPTION OF METHOD
5 - 1.4.1 Building facilities
5 - 1.4.2 Electro-acoustic equipment
5 - 1.4.3 Procedures
6 - 1.4.4 Calculations
6 - 1.5 DEFINITIONS
6 - 1.5.1 Average sound pressure level
6 - 1.5.2 Average sound pressure level difference
6 - 1.5.3 Receiving room equivalent absorption area (A)
6 - 1.5.4 Sound transmission loss (R)
7 - SECTION 2. REQUIREMENTS FOR MEASUREMENTS
7 - 2.1 DIFFUSION
7 - 2.2 FLANKING TRANSMISSION
7 - 2.3 SOUND GENERATION
7 - 2.4 TEST FREQUENCIES
7 - 2.5 FILTERS
7 - 2.5.1 Measurement filter
7 - 2.5.2 Source filter
7 - 2.6 MICROPHONES AND MEASURING SYSTEMS
7 - 2.7 TEST SPECIMEN
7 - 2.8 MICROPHONE LOCATION
7 - 2.9 AVERAGING TIMES
7 - 2.9.1 Discrete microphone position
7 - 2.9.2 Continuous microphone traverse
8 - 2.10 BACKGROUND NOISE
8 - 2.11 EQUIVALENT ABSORPTION AREA
9 - SECTION 3. REPORT ON RESULTS
9 - 3.1 INFORMATION TO BE SUPPLIED
10 - APPENDIX A - ADDITIONAL INFORMATION RELATING TO THE LABORATORY MEASUREMENT OF AIRBORNE SOUND TRANSMISSION LOSS
10 - A1 SCOPE
10 - A2 RECEIVING ROOM EQUIVALENT ABSORPTION AREA
10 - A3 REQUIREMENTS FOR MEASUREMENTS
10 - A3.1 Test room diffusion
10 - A3.1.1 General
10 - A3.1.2 Room volume
10 - A3.1.3 Room dimensions
10 - A3.1.4 Specimen frame
10 - A3.1.5 Room shape and diffusers
11 - A3.1.6 Sound absorption coefficients of surfaces
11 - A3.2 Flanking transmission
11 - A3.2.1 General
11 - A3.2.2 Cross-talk
11 - A3.3 Corrections for background noise
11 - A3.4 Sound generation
11 - A3.5 Test specimen
11 - A3.5.1 Installation
12 - A3.5.2 Ageing
12 - A3.5.3 Filler walls
12 - A4 NUMBER AND PRECISION OF MEASUREMENTS
12 - A4.1 General
12 - A4.2 Method of estimating precision-discrete microphone positions or equivalent
13 - A4.3 Method of estimating precision-continuous averaging over one whole microphone traverse
13 - A4.4 Recommended goals for precision

Sets out the method for the measurement of the airborne sound transmission loss of building partitions such as walls, floor/ceiling assemblies, doors, windows, and other space-divided elements. It prescribes parameters for the room used for measurement, the range of frequencies to be measured, the manner in which sound fields are to be generated and the characteristics of the filters used.

This standard sets out the method for the measurement of the airborne sound transmission loss of building partitions such as walls, floor/ceiling assemblies, doors, windows, and other space-dividing elements. It provides a means of evaluation of the sound-insulating performance of an isolated partition element in a laboratory.The sound transmission loss is defined in terms of a diffusely incident sound field; such a field is intrinsic to the test procedure.

Under Revision see DR 00335