ASTM E1179-87(2003)

Standard Specification for Sound Sources Used for Testing Open Office Components and Systems

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.

General Information

• Status: Historical
• Publication Date: 09-Aug-2003
• ICS: 17.140.01 - Acoustic measurements and noise abatement in general
• Technical Committee: E33 - Building and Environmental Acoustics
• Drafting Committee: E33.02 - Speech Privacy

Relations

• Replaces: ASTM E1179-87(1998) - Standard Specification for Sound Sources Used for Testing Open Office Components and Systems
• Effective Date: 10-Aug-2003
• Replaced By: ASTM E1179-07 - Standard Specification for Sound Sources Used for Testing Open Office Components and Systems
• Effective Date: 01-Oct-2007
• Referred By: ASTM E1130-16(2021) - Standard Test Method for Objective Measurement of Speech Privacy in Open Plan Spaces Using Articulation Index
• Effective Date: 10-Aug-2003
• Referred By: ASTM E1111/E1111M-14(2022) - Standard Test Method for Measuring the Interzone Attenuation of Open Office Components
• Effective Date: 10-Aug-2003
• Referred By: ASTM C634-22 - Standard Terminology Relating to Building and Environmental Acoustics
• Effective Date: 10-Aug-2003
• Referred By: ASTM E1374-18e1 - Standard Guide for Office Acoustics and Applicable ASTM Standards
• Effective Date: 10-Aug-2003

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: E 1179 – 87 (Reapproved 2003)
Standard Specification for
Sound Sources Used for Testing Open Office Components
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 3.2 Descriptions of Terms Specific to This Standard:
3.2.1 qualification signal—a test signal of broadband noise
1.1 This specification states the requirements for sound
or bands of white or pink noise as defined in Terminology
sources used for measuring the speech privacy between open
C 634.
offices or for measuring the laboratory performance of acous-
3.2.2 source point—the point at which the loudspeaker axis
tical components (see Test Methods E 1111 and E 1130).
intersects the front plane of the loudspeaker (see Fig. 1).
1.2 The sound source shall be a loudspeaker located in an
enclosure driven with an appropriate test signal.
4. Sound Source Specifications
1.3 This specification describes the sound source and
4.1 Sound Source Description —The sound source shall be
methodofqualifyingitusingaspecialqualificationsignal.Test
aloudspeakerenclosedinaboxthathasamaximumdimension
signals required by open office test methods may differ.
of 0.30 m (1 ft) on a side, to reduce spurious sound reflections.
2. Referenced Documents 4.2 Directivity—With the source driven with the qualifica-
tion signal, the maximum and minimum sound pressure levels
2.1 ASTM Standards:
within any one-third octave band, measured at a distance of 1.0
C 384 Test Method for Impedance and Absorption of
m (39 in.) from the source point, at any angle up to and
Acoustical Materials by the Impedance Tube Method
including 25° in any direction from the loudspeaker axis, shall
C 634 Terminology Relating to Environmental Acoustics
differ by 2 dB or less.
E 1050 Test Method for Impedance and Absorption of
Acoustical Materials Using aTube,Two Microphones, and
NOTE 1—At angles beyond 25° from the loudspeaker axis, the source
a Digital Frequency Analysis System
shall produce lower levels than within the 50° included angle.
E 1111 Test Method for Measuring the Interzone Attenua- NOTE 2—The directivity requirement may be met by using more than
one loudspeaker, each one used separately to cover a different portion of
tion of Ceiling Systems
the test frequency range.
E 1130 Test Method for Objective Measurement of Speech
Privacy in Open Offices Using Articulation Index
5. Source Qualification
2.2 ANSI Standards:
5.1 Test Environment—The measurements shall be carried
S1.4 Specification for Sound Level Meters
out in a free sound field. The preferred test environment is an
S1.6 Preferred Frequencies and Band Numbers for Acous-
anechoic room with surfaces that have a minimum normal
tical Measurements
incidence sound absorption coefficient of 0.990 at all frequen-
S1.11 Specification for Octave, Half-Octave and One-Third
cies above 175 Hz as measured in accordance with Test
Octave-Band Filter Sets
Methods C 384 or E 1050. Alternatively, an outdoor environ-
ment may be used if it is shown that sound reflections do not
3. Terminology
influence the data.
3.1 Definitions:
5.2 Test Instruments:
3.1.1 The acoustical terminology used in this specification
5.2.1 The measurement microphone, amplifier, and level
is consistent with Terminology C 634.
meter used to measure sound pressure levels shall satisfy the
requirements of ANSI S1.4 for Type 1 or better sound level
meters except that weighting networks are not required.
This specification is under the jurisdiction of ASTM Committee E33 on
EnvironmentalAcousticsandisthedirectresponsibilityofSubcommittee
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