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ASTM E1573-09

(Test Method)

Standard Test Method for Evaluating Masking Sound in Open Offices Using A-Weighted and One-Third Octave Band Sound Pressure Levels

Standard Test Method for Evaluating Masking Sound in Open Offices Using A-Weighted and One-Third Octave Band Sound Pressure Levels

SIGNIFICANCE AND USE
Speech privacy in an open office is dependent on many factors (see Guide E 1374 for a discussion on open office acoustical considerations). One of these factors is the masking sound in the office. Without masking sound in the open office, confidential speech privacy is not possible at normal voice levels. The four critical acoustical parameters of masking sound are its spatial uniformity, temporal uniformity, spectrum shape, and level. The measurement and determination of these parameters are addressed in this test method.
The results from this test method can be used to determine if the masking sound meets a particular specification.
SCOPE
1.1 This test method specifies the procedures that can be used to evaluate the spatial and temporal uniformity of masking sound in open offices using A-weighted sound levels. It also specifies the procedure for evaluating the masking sound spectrum and level using one-third octave band sound pressure levels.
1.2 The results of this test method can be used to determine if the masking sound meets a particular specification for spatial and temporal uniformity if that specification is written in terms of A-weighted sound levels and if the masking sound meets a particular spectrum shape and level in the office area.
1.3 This test method must not be used to evaluate the acoustical environment in an office space. It is intended only to evaluate the masking sound in an office. This test method, for instance, does not evaluate the low frequency rumble  noise found in some offices.  
1.4 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Mar-2009
ICS
91.120.20 - Acoustics in building. Sound insulation
Technical Committee
E33 - Building and Environmental Acoustics
Drafting Committee
E33.02 - Speech Privacy
Current Stage
Ref Project

Relations

Replaces
ASTM E1573-02 - Standard Test Method for Evaluating Masking Sound in Open Offices Using A-Weighted and One-Third Octave Band Sound Pressure Levels
Effective Date
01-Apr-2009
Referred By
ASTM C634-22 - Standard Terminology Relating to Building and Environmental Acoustics
Effective Date
01-Apr-2009
Referred By
ASTM E1374-18e1 - Standard Guide for Office Acoustics and Applicable ASTM Standards
Effective Date
01-Apr-2009

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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E1573 − 09
Standard Test Method for
Evaluating Masking Sound in Open Offices Using
A-Weighted and One-Third Octave Band Sound Pressure
1
Levels
This standard is issued under the fixed designation E1573; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This test method is one of a set of standards for evaluating the acoustical performance of
components or systems in an open office. The other standards in this set deal with the measurement
of the sound attenuation between work stations provided by partial height space dividers, vertical
surfaces, and acoustical ceiling systems; speech privacy; and the evaluation of masking sound.
1. Scope 2. Referenced Documents
2
1.1 This test method specifies the procedures that can be 2.1 ASTM Standards:
used to evaluate the spatial and temporal uniformity of C634 Terminology Relating to Building and Environmental
masking sound in open offices usingA-weighted sound levels. Acoustics
Italsospecifiestheprocedureforevaluatingthemaskingsound E1374 Guide for Open Office Acoustics and Applicable
spectrum and level using one-third octave band sound pressure ASTM Standards
3
levels.
2.2 ANSI Standards:
S1.11 –2004 Specification for Octave-Band and Fractional-
1.2 The results of this test method can be used to determine
Octave Band Analog and Digital Filters
if the masking sound meets a particular specification for spatial
S1.43 –1997 (R 2007) Specifications for integrating averag-
and temporal uniformity if that specification is written in terms
ing sound level meters
of A-weighted sound levels and if the masking sound meets a
IEC61672 –2002Electroacoustics-SoundLevelmeters-part
particular spectrum shape and level in the office area.
1: specifications
1.3 This test method must not be used to evaluate the
acoustical environment in an office space. It is intended only to
3. Terminology
evaluate the masking sound in an office. This test method, for
3.1 Definitions—The acoustical terminology used in this
instance, does not evaluate the low frequency rumble noise
test method is consistent with the definitions in Terminology
found in some offices.
C634.
1.4 This standard does not purport to address all of the
3.2 Definitions of Terms Specific to This Standard:
safety problems, if any, associated with its use. It is the
3.2.1 masking sound—sound within an office that reduces
responsibility of the user of this standard to establish appro-
the intelligibility of intruding speech and the distraction from
priate safety and health practices and determine the applica-
activity noise. Masking sound may be produced by a masking
bility of regulatory limitations prior to use.
1 2
ThistestmethodisunderthejurisdictionofASTMCommitteeE33onBuilding For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and Environmental Acoustics and is the direct responsibility of Subcommittee contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
E33.02 on Speech Privacy. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 1, 2009. Published April 2009. Originally the ASTM website.
3
approved in 1993. Last previous edition approved in 2002 as E1573–02. DOI: Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/E1573-09. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1573 − 09
sound system, heating, ventilating, and air conditioning 6.5 The office space shall be unoccupied during the tests.
(HVAC) sources, or other sources.
7. Test Signal
3.2.2 masking sound system—the electronic equipment and
7.1 The test signal used for this evaluation may be any of
loudspeakersusedtogenerate,distribute,andproducemasking
the following:
sound throughout an office space.
7.1.1 The sound due to the HVAC system, the masking
3.2.3 spatial uniformity—a condition where the sound pres-
sound system, and any other noise sources,
sure levels throughout a defined space do not vary significantly
7.1.2 The sound due to the masking sound system alone, or
from the arithmetic mean sound pressure level. The amount of
7.1.3 The sound due to the HVAC system alone.
allowable variation is specified by others such as a consultant,
7.2 If the intent is to evaluate the performance of the
designer, or owner.
combination of sounds from the masking sound system, sound
3.2.4 temporal uniformity—at a given position, a condition
sources asso
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E1573–02 Designation:E1573–09
Standard Test Method for
Evaluating Masking Sound in Open Offices Using
A-Weighted and One-Third Octave Band Sound Pressure
1
Levels
This standard is issued under the fixed designation E 1573; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This test method is one of a set of standards for evaluating the acoustical performance of
components or systems in an open office. The other standards in this set deal with the measurement
of the sound attenuation between work stations provided by partial height space dividers, vertical
surfaces, and acoustical ceiling systems; speech privacy; and the evaluation of masking sound.
1. Scope
1.1 This test method specifies the procedures that can be used to evaluate the spatial and temporal uniformity of masking sound
in open offices usingA-weighted sound levels. It also specifies the procedure for evaluating the masking sound spectrum and level
using one-third octave band sound pressure levels.
1.2 The results of this test method can be used to determine if the masking sound meets a particular specification for spatial and
temporal uniformity if that specification is written in terms ofA-weighted sound levels and if the masking sound meets a particular
spectrum shape and level in the office area.
1.3 This test method must not be used to evaluate the acoustical environment in an office space. It is intended only to evaluate
the masking sound in an office. This test method, for instance, does not evaluate the low frequency rumble noise found in some
offices.
1.4 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C 634 Terminology Relating to Building and Environmental Acoustics
E 1374 Guide for Open Office Acoustics and Applicable ASTM Standards
3
2.2 ANSI Standards:
S1.11 –2004 Specification for Octave-Band and Fractional-Octave Band Analog and Digital Filters
S1.4Specification for Sound Level Meters S1.43 –1997 (R 2007) Specifications for integrating averaging sound level meters
IEC 61672 –2002 Electroacoustics- Sound Level meters-part 1: specifications
3. Terminology
3.1 Definitions—The acoustical terminology used in this test method is consistent with the definitions in Terminology C 634.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 masking sound—sound within an office that reduces the intelligibility of intruding speech and the distraction from activity
noise. Masking sound may be produced by a masking sound system, heating, ventilating, and air conditioning (HVAC) sources,
or other sources.
1
This test method is under the jurisdiction of ASTM Committee E33 on Building and Environmental Acoustics and is the direct responsibility of Subcommittee E33.02
on Open Plan Spaces.
Current edition approved April 10, 2002. Published June 2002. Originally published as E1573–93. Last previous edition E1573–98.
Current edition approved April 1, 2009. Published April 2009. Originally approved in 1993. Last previous edition approved in 2002 as E 1573–02.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
, Vol 04.06.volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 WestW. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E1573–09
3.2.2 masking sound system—the electronic equipment and loudspeakers used to generate, distribute, and produce masking
sound throughout an office space.
3.2.3 spatial uniformity—a condition where the sound pressure levels throughout a defined space do not vary significantly from
the arithmetic mean sound pressure level. The amount of allowable variation is specified by others such as a consultant, designer,
or owner.
3.2.4 temporal uniformity—at a given position, a c
...

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SCOPE
1.1 This test method covers the use of an impedance tube, alternatively called a standing wave apparatus, for the measurement of impedance ratios and the normal incidence sound absorption coefficients of acoustical materials.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM C522-03(2022)(Test Method)
Standard Test Method for Airflow Resistance of Acoustical Materials

SIGNIFICANCE AND USE
5.1 The specific airflow resistance of an acoustical material is one of the properties that determine its sound-absorptive and sound-transmitting properties. Measurement of specific airflow resistance is useful during product development, for quality control during manufacture, and for specification purposes.  
5.2 Valid measurements are made only in the region of laminar airflow where, aside from random measurement errors, the airflow resistance (R = P/U) is constant. When the airflow is turbulent, the apparent airflow resistance increases with an increase of volume velocity and the term “airflow resistance” does not apply.  
5.3 The specific airflow resistance measured by this test method may differ from the specific resistance measured by the impedance tube method in Test Method E384 for two reasons. In the presence of sound, the particle velocity inside a porous material is alternating while in this test method, the velocity is constant and in one direction only. Also, the particle velocity inside a porous material is not the same as the linear velocity measured outside the specimen.
SCOPE
1.1 This test method covers the measurement of airflow resistance and the related measurements of specific airflow resistance and airflow resistivity of porous materials that can be used for the absorption and attenuation of sound. Materials cover a range from thick boards or blankets to thin mats, fabrics, papers, and screens. When the material is anisotropic, provision is made for measurements along different axes of the specimen.  
1.2 This test method is designed for the measurement of values of specific airflow resistance ranging from 100 to 10 000 mks rayls (Pa·s/m) with linear airflow velocities ranging from 0.5 mm/s to 50 mm/s and pressure differences across the specimen ranging from 0.1 Pa to 250 Pa. The upper limit of this range of linear airflow velocities is a point at which the airflow through most porous materials is in partial or complete transition from laminar to turbulent flow.  
1.3 A procedure for accrediting a laboratory for the purposes of this test method is given in Annex A1.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4.1 Table 1 is provided for user to convert into cgs units.    
cgs acoustic ohm  
mks acoustic ohm (Pa·s/m3)  
105  
cgs rayl  
mks rayl (Pa·s/m)  
10    
cgs rayl/cm  
mks rayl/m (Pa·s/m2)  
103  
cgs rayl/in.  
mks rayl/m (Pa·s/m2)  
394  
mks rayl/in.  
mks rayl/m (Pa·s/m2)  
39.4  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM E1042-22(Classification)
Standard Classification for Acoustically Absorptive Materials Applied by Trowel or Spray

SIGNIFICANCE AND USE
4.1 Acoustically absorptive materials are used for the control of reverberation and echoes in rooms. This standard provides a classification method for acoustically absorptive materials applied directly to surfaces by trowel or by spray.
SCOPE
1.1 This classification covers materials applied by trowel or spray to surfaces for the purpose of increasing their acoustical absorption.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM E1573-22(Test Method)
Standard Test Method for Measurement and Reporting of Masking Sound Levels Using A-Weighted and One-Third-Octave-Band Sound Pressure Levels

SIGNIFICANCE AND USE
5.1 Acoustical performance is dependent on many factors (see Guide E1374 for a discussion on general office acoustical considerations). One of these factors is the masking sound. The masking spectrum shape and level must conform within specified tolerances throughout the treated area. The measurement and recording of these parameters are addressed in this test method.  
5.2 The results from this test method are used to determine if the masking sound meets a particular specification.
SCOPE
1.1 This test method specifies the procedure used to measure the masking sound in terms of A-weighted and one-third-octave-band sound pressure levels.  
1.2 The results of this test method can be used to determine if and where the masking sound meets (or does not meet) a particular specification.  
1.3 This test method does not evaluate the overall acoustical environment. It is intended only to measure and report the masking sound levels.  
1.4 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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