ASTM E1179-07
(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 – 07
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 3. Terminology
1.1 This specification states the requirements for sound 3.1 Definitions:
sources used for measuring the speech privacy between open 3.1.1 The acoustical terminology used in this specification
offices or for measuring the laboratory performance of acous- is consistent with Terminology C634.
tical components (see Test Methods E1111 and E1130). 3.2 Descriptions of Terms Specific to This Standard:
1.2 The sound source shall be a loudspeaker located in an 3.2.1 directivity measurement—the measurement used to
enclosure driven with an appropriate test signal. determine directivity as defined in 4.2.
1.3 This specification describes the sound source and 3.2.2 qualification signal—a test signal of broadband noise
methodofqualifyingitusingaspecialqualificationsignal.Test or bands of white or pink noise as defined in Terminology
signals required by open office test methods may differ. C634.
3.2.3 source point—the point at which the loudspeaker axis
2. Referenced Documents
intersects the front plane of the loudspeaker (see Fig. 1).
2
2.1 ASTM Standards:
3.3 The following terms in this standard have specific
C384 Test Method for Impedance andAbsorption ofAcous- meanings that are defined in Terminology C634:
tical Materials by Impedance Tube Method
3.3.1 background noise,
C634 Terminology Relating to Building and Environmental 3.3.2 pink noise,
Acoustics 3.3.3 sound pressure level, and
E1050 Test Method for Impedance and Absorption of
3.3.4 white noise
Acoustical Materials UsingATube, Two Microphones and
4. Sound Source Specifications
A Digital Frequency Analysis System
E1111 TestMethodforMeasuringtheInterzoneAttenuation 4.1 Sound Source Description—The sound source shall be a
of Open Office Components loudspeaker enclosed in a box that has a maximum dimension
E1130 Test Method for Objective Measurement of Speech of 0.30 m (1 ft) on a side, to reduce spurious sound reflections.
Privacy in Open Plan Spaces Using Articulation Index 4.2 Directivity—With the source driven with the qualifica-
2.2 ANSI Standards: tion signal, the maximum and minimum sound pressure levels
3
S1.4 Specification for Sound Level Meters within any one-third octave band, from 200 to 3150 Hz
S1.6 Preferred Frequencies, Frequency Levels, and Band measured at a distance of 1.0 m (39 in.) from the source point,
3
Numbers for Acoustical Measurements at any angle up to and including 25° in any direction from the
S1.11 Specification for Octave Band and Fractional OB loudspeaker axis, shall differ by 2 dB or less. At frequencies
3
Analog and Digital Filters above 3150 Hz, the difference can be 3dB or less.
S1.43 Specifications for Integrating-Averaging Sound Level
NOTE 1—At angles beyond 25° from the loudspeaker axis, the source
3
Meters
shall produce lower levels than within the 50° included angle.
NOTE 2—The directivity requirement may be met by using more than
1 one loudspeaker, each one used separately to cover a different portion of
This specification is under the jurisdiction of ASTM Committee E33 on
the test frequency range.
Building and Environmental Acoustics and is the direct responsibility of Subcom-
mittee E33.02 on Open Plan Spaces.
5. Source Qualification
Current edition approved Oct. 1, 2007. Published November 2007. Originally
approved in 1987. Last previous edition approved in 2003 as E1179 – 87 (2003).
5.1 Test Environment—The measurements shall be carried
DOI: 10.1520/E1179-07.
2 out in a free sound field. The preferred test environment is an
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM anechoic room with surfaces that have a minimum normal
Standards volume information, refer to the standard’s Document Summary page on
incidence sound absorption coefficient of 0.990 at all frequen-
the ASTM website.
cies above 175 Hz as measured in accordance with Test
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Methods C384 or E1050 or, by the use of other methods, can
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
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E1179 – 07
FIG. 1 Measurement Points for Sound Source Directivity
be shown to be essentially an
...
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:E1179–87 (Reapproved 2003) Designation: E 1179 – 07
Standard Specification for
Sound Sources Used for Testing Open Office Components
1
and Systems
This standard is issued under the fixed designation E 1179; 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 (e) 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 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C 384 Test Method for Impedance and Absorption of Acoustical Materials by the Impedance Tube Method
C 634 Terminology Relating to Building and Environmental Acoustics
E 1050 Test Method for Impedance andAbsorption ofAcoustical Materials Using aATube, Two Microphones, and aADigital
Frequency Analysis System
2
E 1111 Test Method for Measuring the Interzone Attenuation of Ceiling Systems Open Office Components
E 1130 Test Method for Objective Measurement of Speech Privacy in Open Offices Using Articulation Index
2.2 ANSI Standards:
3
S1.4 Specification for Sound Level Meters
3
S1.6 Preferred Frequencies, Frequency Levels, and Band Numbers for Acoustical Measurements
3
S1.11Specification for Octave, Half-Octave and One-Third Octave-Band Filter Sets Specification for Octave Band and
3
Fractional OB Analog and Digital Filters
3
S1.43 Specifications for Integrating-Averaging Sound Level Meters
3. Terminology
3.1 Definitions:
3.1.1 The acoustical terminology used in this specification is consistent with Terminology C 634.
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 C 634.
3.2.2
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 C 634:
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
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 Aug. 10, 2003.Oct. 1, 2007. Published September 2003.November 2007. Originally approved in 1987. Last previous edition approved in
19982003 as E1179–87 (1998).E 1179 – 87 (2003).
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 W. 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 ----------------------
E1179–07
FIG. 1 Measurement Points for Sound Source Directivity
0.30 m (1 ft) on a side, to reduce spurious sound reflections.
4.2 Directivity— With the source driven with the qualification signal, the maximum and minimum sound pressure levels within
any one-third octave band, from 200 to 3150 Hz measured at a distance of 1.0 m (39 in.) from the source point, at any angle up
to and including 25° in any direction from the loudspeaker axis, shall differ by 2 dB or less. At frequencies above 3150 Hz, the
difference can be 3dB or less.
NOTE 1—At angles beyond 25° from the loudspeaker axis, the source shall produce lower levels than within the 50° included angle.
NOTE 2—The directivity requirement may be met by using more than one loudspeaker, each one use
...
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