ASTM E1179-11
(Specification)Standard Specification for Sound Sources Used for Testing Open Office Components and Systems
Standard Specification for Sound Sources Used for Testing Open Office Components and Systems
ABSTRACT
This specification states the requirements for sound sources used for measuring the speech privacy between open offices or for measuring the laboratory performance of acoustical components. The sound source shall be a loudspeaker enclosed in a box that has a maximum dimension of 0.30 m (1 ft) on a side, to reduce spurious sound reflections. The measurements shall be carried out in a free sound field. The measurement microphone, amplifier, and level meter used to measure sound pressure levels shall satisfy the requirements prescribed. When the sound source is driven with the qualification signal, the sound output shall be adequate to maintain one-third octave-band sound pressure levels at least 10 dB above the corresponding background noise in each band at each measurement location. The directivity of the sound source shall be verified by driving the source with the qualification signal and measuring the sound pressure levels at measurement points.
SCOPE
1.1 This specification states the requirements for sound sources used for measuring the speech privacy between open offices or for measuring the laboratory performance of acoustical components (see Test Methods E 1111 and E 1130).
1.2 The sound source shall be a loudspeaker located in an enclosure driven with an appropriate test signal.
1.3 This specification describes the sound source and method of qualifying it using a special qualification signal. Test signals required by open office test methods may differ.
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Designation:E1179 −11
StandardSpecification for
Sound Sources Used for Testing Open Office Components
1
and Systems
This standard is issued under the fixed designation E1179; 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.
1. Scope S1.6 Preferred Frequencies, Frequency Levels, and Band
Numbers for Acoustical Measurements
1.1 This specification states the requirements for sound
S1.11 Specification for Octave Band and Fractional OB
sources used for measuring the speech privacy between open
Analog and Digital Filters
offices and for measuring the laboratory performance of
S1.43 Specifications for Integrating-Averaging Sound Level
acoustical components (see Test Methods E1111 and E1130).
Meters
1.2 The sound source shall be a loudspeaker located in an
4
2.3 IEC Standards:
enclosure driven with an appropriate test signal.
61260 Electroacoustics—Octave and fractional-octave band
1.3 This specification describes the sound source and
filters
methodofqualifyingitusingaspecialqualificationsignal.Test 61672–1 Electroacoustics—Sound Level Meters—Part 1:
signals required by open office test methods may differ.
Specifications
1.4 The values stated in SI units are to be regarded as
3. Terminology
standard. No other units of measurement are included in this
3.1 Definitions:
standard.
3.1.1 The acoustical terminology used in this specification
is consistent with Terminology C634.
2. Referenced Documents
3.2 Definitions of Terms Specific to This Standard:
2
2.1 ASTM Standards:
3.2.1 directivity measurement—the measurement used to
C384 Test Method for Impedance andAbsorption ofAcous-
determine directivity as defined in 4.2.
tical Materials by Impedance Tube Method
3.2.2 qualification signal—a test signal of broadband noise
C634 Terminology Relating to Building and Environmental
or bands of white or pink noise as defined in Terminology
Acoustics
C634.
E1050 Test Method for Impedance and Absorption of
Acoustical Materials Using aTube,Two Microphones and 3.2.3 source point—the point at which the loudspeaker axis
a Digital Frequency Analysis System intersects the front plane of the loudspeaker (see Fig. 1).
E1111 Test Method for Measuring the InterzoneAttenuation
3.3 The following terms in this standard have specific
of Open Office Components
meanings that are defined in Terminology C634:
E1130 Test Method for Objective Measurement of Speech
3.3.1 background noise,
Privacy in Open Plan Spaces Using Articulation Index
3.3.2 pink noise,
3
2.2 ANSI Standards:
3.3.3 sound pressure level, and
S1.4 Specification for Sound Level Meters 3.3.4 white noise
4. Sound Source Specifications
1
4.1 Sound Source Description—The sound source shall be a
This specification is under the jurisdiction of ASTM Committee E33 on
Building and Environmental Acoustics and is the direct responsibility of Subcom-
loudspeaker enclosed in a box that has a maximum dimension
mittee E33.02 on Open Plan Spaces.
of 0.30 m on a side.
Current edition approved Nov. 1, 2011. Published December 2011. Originally
approved in 1987. Last previous edition approved in 2007 as E1179 – 07. DOI:
4.2 Directivity—With the source driven with the qualifica-
10.1520/E1179-11.
tion signal, the maximum and minimum sound pressure levels
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
of any one-third octave band, from 200 to 3150 Hz measured
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3 4
Available from American National Standards Institute (ANSI), 25 W. 43rd St., Available from International Electrotechnical Commission (IEC), 3, rue de
4th Floor, New York, NY 10036, http://www.ansi.org. Varembé, P.O. Box 131, CH-1211 Geneva 20, Switzerland, http://www.iec.ch.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E1179−11
FIG. 1 Measurement Points for Sound Source Directivity
at a distance of 1.0 m from the source point, at any angle up to 5.3 Qualification Sound Output—When the sound source is
and including 25° in any direction from the loudspeaker axis, driven with the qualification signal, the sound output shall be
shall differ by no more than 2 dB. At frequencies above 3150 adequate to maintain one-third octave-band sound pressure
Hz, the difference shall be no more than 3dB. levelsatleast10dBabovethecorrespondingbackgroundnoise
in each band at each measurement location.
NOTE 1—At angles beyond 25° from the loudspeaker axis, th
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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:E1179–07 Designation: E1179 – 11
Standard Specification for
Sound Sources Used for Testing Open Office Components
1
and Systems
This standard is issued under the fixed designation E1179; 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.
1. Scope
1.1 This specification states the requirements for sound sources used for measuring the speech privacy between open offices
orand for measuring the laboratory performance of acoustical components (see Test Methods E1111 and E1130).
1.2 The sound source shall be a loudspeaker located in an enclosure driven with an appropriate test signal.
1.3 This specification describes the sound source and method of qualifying it using a special qualification signal. Test signals
required by open office test methods may differ.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
2. Referenced Documents
2
2.1 ASTM Standards:
C384 Test Method for Impedance and Absorption of Acoustical Materials by Impedance Tube Method
C634 Terminology Relating to Building and Environmental Acoustics
E1050 Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones and a Digital
Frequency Analysis System
E1111 Test Method for Measuring the Interzone Attenuation of Open Office Components
E1130 Test Method for Objective Measurement of Speech Privacy in Open Plan Spaces Using Articulation Index
3
2.2 ANSI Standards:
S1.4 Specification for Sound Level Meters
S1.6 Preferred Frequencies, Frequency Levels, and Band Numbers for Acoustical Measurements
3
S1.11Specification for Octave Band and Fractional OB Analog and Digital Filters
3
S1.43Specifications for Integrating-Averaging Sound Level Meters Specification for Octave Band and Fractional OBAnalog
and Digital Filters
S1.43 Specifications for Integrating-Averaging Sound Level Meters
4
2.3 IEC Standards:
61260 Electroacoustics—Octave and fractional-octave band filters
61672–1 Electroacoustics—Sound Level Meters—Part 1: Specifications
3. Terminology
3.1 Definitions:
3.1.1 The acoustical terminology used in this specification is consistent with Terminology C634.
3.2 Descriptions of Terms Specific to This Standard:
3.2.1 directivity measurement—the measurement used to determine directivity as defined in 4.2.
3.2.2 qualification signal—a test signal of broadband noise or bands of white or pink noise as defined in Terminology C634.
3.2.3 source point—the point at which the loudspeaker axis intersects the front plane of the loudspeaker (see Fig. 1).
3.3 The following terms in this standard have specific meanings that are defined in Terminology C634:
1
This specification is under the jurisdiction ofASTM Committee E33 on Building and EnvironmentalAcoustics and is the direct responsibility of Subcommittee E33.02
on Open Plan Spaces.
Current edition approved Oct. 1, 2007. Published November 2007. Originally approved in 1987. Last previous edition approved in 2003 as E1179–87 (2003). DOI:
10.1520/E1179-07.
Current edition approved Nov. 1, 2011. Published December 2011. Originally approved in 1987. Last previous edition approved in 2007 as E1179 – 07. DOI:
10.1520/E1179-11.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Available from International Electrotechnical Commission (IEC), 3, rue de Varembé, P.O. Box 131, CH-1211 Geneva 20, Switzerland, http://www.iec.ch.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
E1179 – 11
FIG. 1 Measurement Points for Sound Source Directivity
3.3.1 background noise,
3.3.2 pink noise,
3.3.3 sound pressure level, and
3.3.4 white noise
4. Sound Source Specifications
4.1 Sound Source Description—The sound source shall be a loudspeaker enclosed in a box that has a maximum dimension of
0.30 m (1 ft) on a side, to reduce spurious sound reflections. side.
4.2 Directivity—With the source driven with the qualification
...
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