AS 2253-1979

1 - AS 2253-1979 METHODS FOR FIELD MEASUREMENT OF THE REDUCTION OF AIRBORNE SOUND TRANSMISSION IN BUILDINGS
4 - PREFACE
6 - CONTENTS
7 - SECTION 1. SCOPE, APPLICATION AND DEFINITIONS
7 - 1.1 SCOPE.
7 - 1.2 APPLICATION.
7 - 1.2.1 Field Transmission Loss
7 - 1.2.2 Noise Reduction
8 - 1.3 DEFINITIONS.
8 - 1.3.1 Average sound pressure level
8 - 1.3.2 Average pressure level difference
8 - 1.3.3 Receiving room equivalent absorption area
8 - 1.3.4 Field transmission loss
9 - 1.3.5 Noise reduction
10 - SECTION 2. MEASUREMENT OF FIELD TRANSMISSION LOSS
10 - 2.1 SCOPE OF SECTION.
10 - 2.2 GENERAL.
10 - 2.3 REVERBERANT SOURCE AND RECEIVING ROOMS.
10 - 2.3.1 Sound Absorption Coefficients of Surfaces.
10 - 2.3.2 Room Diffusion.
12 - 2.3.4 Microphone Location.
12 - 2.4 EITHER OR BOTH SOURCE AND RECEIVING SPACES HIGHLY ABSORPTIVE.
12 - 2.4.1 Sound Absorption Coefficients of Surfaces.
12 - 2.4.2 Sound Source.
13 - 2.4.3 Measurement of Sound Pressure in a Highly Absorptive Source Space.
13 - 2.4.4 Measurement of Sound Pressure in a Highly Absorptive Receiving Space.
13 - 2.5 INTERMEDIATE CONFIGURATIONS.
13 - 2.5.1 Measurement Procedure.
13 - 2.6 REQUIREMENTS FOR MEASUREMENTS.
13 - 2.6.1 Flanking Transmission.
14 - 2.6.2 Background Noise.
14 - 2.6.3 Area of Specimen.
14 - 2.6.4 Test Si gnals.
14 - 2.6.5 Filters.
14 - 2.6.6 Sound Absorption Coefficients.
14 - 2.7 CALCULATION OF FIELD TRANSMISSION LOSS.
14 - 2.7.1 General.
15 - 2.7.2 Reverberant Source and Reverberant Receiving Rooms.
15 - 2.7.3 Highly Absorptive Source Room or Outdoors, and a Reverberant Receiving Room.
15 - 2.7.4 Reverberant Source Room and Highly Absorptive Receiving Room or Outdoors.
15 - 2.7.5 Both Source and Receiving Spaces Highly Absorptive.
16 - 2.8 REPORT ON RESULTS.
18 - SECTION 3. MEASUREMENT OF NOISE REDUCTION
18 - 3.1 SCOPE OF SECTION.
18 - 3.2 GENERAL.
18 - 3.3 REQUIREMENTS FOR MEASUREMENTS.
18 - 3.3.1 Sound Source.
18 - 3.3.2 Microphone Location.
18 - 3.3.3 Test Signals.
19 - 3.3.4 Background Noise.
19 - 3.4 CALCULATION OF NOISE REDUCTION.
19 - 3.5 REPORT ON RESULTS.
21 - APPENDIX A - ADDITIONAL INFORMATION RELATING TO THE FIELD MEASUREMENT OF AIRBORNE SOUND TRANSMISSION
21 - A1 SCOPE.
21 - A2 MEASUREMENT OF SOUND ABSORPTION.
21 - A2.1 General.
21 - A2.2 Decay Rate Method.
21 - A2.3 Reference Sound Source Method.
21 - A2.4 Characteristics of Reference Sound Source.
22 - A3 GENERATION OF SOUND FIELD.
22 - A3.1 Loudspeaker.
22 - A3.2 Sound Source Positions.
23 - A3.3 Direct Field of Sound Source(s).
23 - A3.4 Test Signals.
24 - A4 PRECISION OF MEASUREMENTS.
24 - A4.1 Estimates of Precision.
24 - A4.2 Unusual Test Partition, Shape, Size or Conditions.
24 - A5 FLANKING TRANSMISSION.
24 - A5.1 General.
24 - A5.2 Preliminary Checks.
25 - A5.3 Complete Check.
25 - A6 BACKGROUND NOISE.
25 - A6.1 Margin Between Signal Level and Background Noise.
26 - A6.2 Corrections.
27 - A7 SOUND PRESSURE LEVEL MEASUREMENTS.
27 - A7.1 Sound Level Meter.
27 - A7.2 Filters.
27 - A7.3 Sensitivity Checks.

Describes methods for the measurement of the field transmission loss and noise reduction of building partitions, including walls of all kinds, floor-ceiling assemblies, doors, etc.

This standard sets out the methods for the field measurement of the reduction in the transmission of airborne sound between the spaces in a building separated by a partition (see Note).The procedures are intended for the measurement of -(a) field transmission loss (FTL); and (b) noise reduction (NRf).NOTE: The term 'partition' includes in its meaning walls of all kinds, floor-ceiling assemblies, doors, and other space-dividing elements that may be permanent, openable or movable.

Under Revision See DR 02290 CP