ASTM E1110-86(1994)e1

Standard Classification for Determination of Articulation Class

SCOPE
1.1 This classification provides a single figure rating that can be used for comparing building systems and subsystems for speech privacy purposes. The rating is designed to correlate with transmitted speech intelligence between office spaces.  
1.2 Excluded from the scope of this classification are applications involving female speakers or children, languages other than English, and sound spectra other than speech. Thus excluded, for example, would be comparisons of building systems or subsystems for their effectiveness in reducing transmitted noise from machinery, industrial processes, bowling alleys, music rooms, places of entertainment, and the like.  
Note 1--Recently published work by Pearsons, et al, may eventually permit the restriction on female speakers to be relaxed.

General Information

• Status: Historical
• Publication Date: 09-Mar-2001
• 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 E1110-01 - Standard Classification for Determination of Articulation Class
• Effective Date: 10-Mar-2001
• Referred By: ASTM C634-22 - Standard Terminology Relating to Building and Environmental Acoustics
• Effective Date: 10-Mar-2001
• Referred By: ASTM E1111/E1111M-14(2022) - Standard Test Method for Measuring the Interzone Attenuation of Open Office Components
• Effective Date: 10-Mar-2001
• Referred By: ASTM E1264-23 - Standard Classification for Acoustical Ceiling Products
• Effective Date: 10-Mar-2001
• Referred By: ASTM E1374-18e1 - Standard Guide for Office Acoustics and Applicable ASTM Standards
• Effective Date: 10-Mar-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: E 1110 – 86 (Reapproved 1994)
Standard Classification for
Determination of Articulation Class
This standard is issued under the fixed designation E 1110; 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.
e NOTE—Keywords were added editorially in December 1994.
1. Scope AC 5 A f w f (1)
~ ! ~ !
( i i
f
i
1.1 This classification provides a single figure rating that
where:
can be used for comparing building systems and subsystems
f 5 the center frequency of the bands from 200 to 5000
i
for speech privacy purposes. The rating is designed to correlate
Hz,
with transmitted speech intelligence between office spaces.
A(f ) 5 the measured attenuation in decibels in the one-
i
1.2 Excluded from the scope of this classification are
third octave band with center frequency f , and
i
applications involving female speakers or children, languages
w(f ) 5 the weighting for that band, from Table 1.
i
other than English, and sound spectra other than speech. Thus
3.2 The sound attenuation for each band is determined in
excluded, for example, would be comparisons of building
accordance with the appropriate test method. Current test
systems or subsystems for their effectiveness in reducing
methods are Test Method E 1111 and Proposed Method P 105.
transmitted noise from machinery, industrial processes, bowl-
In Test Method E 1111, interzone attenuation is substituted for
ing alleys, music rooms, places of entertainment, and the like.
sound attenuation.
NOTE 1—Recently published work by Pearsons, et al, may eventually
permit the restriction on female speakers to be relaxed.
TABLE 1 Weighting Factor, for Calculation of Articulation Class
2. Referenced Documents
Band Center Frequency, Hz Weighting Factor
2.1 ASTM Standards:
200 0.12
C 634 Terminology Relating to Environmental Acoustics 250 0.30
315 0.30
E 1111 Test Method for Measuring the Interzone Attenua-
400 0.42
tion of Ceiling Systems
500 0.42
P 105 Proposed Method for Laboratory Measurement of
630 0.60
800 0.60
Sound Attenuation of Partial Height Space Dividers
1000 0.72
2.2 ANSI Standard:
1250 0.90
S3.5 Methods for the Calculation of the Articulation Index 1600 1.11
2000 1.14
2500 1.02
3. Summary of Classification
3150 1.02
3.1 Articulation class (AC) is the sum of the weighted sound
4000 0.72
5000 0.60
attenuations in a series of 15 test bands. It is calculated as
follows:
4. Significance and Use
This classification is under the jurisdiction of ASTM Committee E-33 on
4.1 Each weighting factor given in Table 1 represents the
Environmental Acoustics and is the direct responsibility of Subcommittee E 33.02
on Open Plan Spaces.
fraction of overall speech intelligence contained within the
Current edition approved April 25, 1986. Published June 1986.
associated one-third octave frequency band.
This is based on a similar exclusion in ANSI S3.5.
4.2 The weighting factors in Table 1 are obtained by
Pearsons, K. S., Bennett, R. L., and F
...