ASTM E1179-87(1998)

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 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.

General Information

• Status: Historical
• Publication Date: 09-Jul-1998
• 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

• Replaced By: ASTM E1179-87(2003) - Standard Specification for Sound Sources Used for Testing Open Office Components and Systems
• Effective Date: 10-Aug-2003
• Referred By: ASTM C634-22 - Standard Terminology Relating to Building and Environmental Acoustics
• Effective Date: 10-Jul-1998
• 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-Jul-1998
• Referred By: ASTM E1111/E1111M-14(2022) - Standard Test Method for Measuring the Interzone Attenuation of Open Office Components
• Effective Date: 10-Jul-1998
• Referred By: ASTM E1374-18e1 - Standard Guide for Office Acoustics and Applicable ASTM Standards
• Effective Date: 10-Jul-1998

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: E 1179 – 87 (Reapproved 1998)
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 3.2.1 qualification signal—a test signal of broadband noise
or bands of white or pink noise as defined in Terminology
1.1 This specification states the requirements for sound
C 634.
sources used for measuring the speech privacy between open
3.2.2 source point—the point at which the loudspeaker axis
offices or for measuring the laboratory performance of acous-
intersects the front plane of the loudspeaker (see Fig. 1).
tical components (see Test Methods E 1111 and E 1130).
1.2 The sound source shall be a loudspeaker located in an
4. Sound Source Specifications
enclosure driven with an appropriate test signal.
4.1 Sound Source Description —The sound source shall be
1.3 This specification describes the sound source and
a loudspeaker enclosed in a box that has a maximum dimension
method of qualifying it using a special qualification signal. Test
of 0.30 m (1 ft) on a side, to reduce spurious sound reflections.
signals required by open office test methods may differ.
4.2 Directivity— With the source driven with the qualifica-
2. Referenced Documents tion signal, the maximum and minimum sound pressure levels
within any one-third octave band, measured at a distance of 1.0
2.1 ASTM Standards:
m (39 in.) from the source point, at any angle up to and
C 384 Test Method for Impedance and Absorption of
including 25° in any direction from the loudspeaker axis, shall
Acoustical Materials by the Impedance Tube Method
2 differ by 2 dB or less.
C 634 Terminology Relating to Environmental Acoustics
E 1050 Test Method for Impedance and Absorption of
NOTE 1—At angles beyond 25° from the loudspeaker axis, the source
Acoustical Materials Using a Tube, Two Microphones, and
shall produce lower levels than within the 50° included angle.
NOTE 2—The directivity requirement may be met by using more than
a Digital Frequency Analysis System
one loudspeaker, each one used separately to cover a different portion of
E 1111 Test Method for Measuring the Interzone Attenua-
2 the test frequency range.
tion of Ceiling Systems
E 1130 Test Method for Objective Measurement of Speech
5. Source Qualification
Privacy in Open Offices Using Articulation Index
5.1 Test Environment— The measurements shall be carried
2.2 ANSI Standards:
out in a free sound field. The preferred test environment is an
S1.4 Specification for Sound Level Meters
anechoic room with surfaces that have a minimum normal
S1.6 Preferred Frequencies and Band Numbers for Acous-
incidence sound absorption coefficient of 0.990 at all frequen-
tical Measurements
cies above 175 Hz as measured in accordance with Test
S1.11 Specification for Octave, Half-Octave and One-Third
Methods C 384 or E 1050. Alternatively, an outdoor environ-
Octave-Band Filter Sets
ment may be used if it is shown that sound reflections do not
influence the data.
3. Terminology
5.2 Test Instruments:
3.1 Definitions:
5.2.1 The measurement microphone, amplifier, and level
3.1.1 The acoustical terminology used in this specification
meter used to measure sound pressure levels shall satisfy the
is consistent with Terminology C 634.
requirements of ANSI S1.4 for Type 1 or better sound level
3.2 Descriptions of Terms Specific to This Standard:
meters except that weighting networks are not required.
5.2.2 A free field microphone shall be used, that is, one that
has its flattest frequency response for sounds arriving normal to
This specification is under the jurisdiction of ASTM Committee E-33 on
the diaphragm.
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