ASTM E1110-01

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

• Replaces: ASTM E1110-86(1994)e1 - Standard Classification for Determination of Articulation Class
• Effective Date: 10-Mar-2001
• Replaced By: ASTM E1110-06 - Standard Classification for Determination of Articulation Class
• Effective Date: 01-Sep-2006
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E 1110 – 01
Standard Classification for
1
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.
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 = the center frequency of the bands from 200 to 5000
for speech privacy purposes.The rating is designed to correlate i
Hz,
with transmitted speech intelligence between office spaces.
A(f) = the measured attenuation in decibels in the one-
i
1.2 Excluded from the scope of this classification are
2 third octave band with center frequency f, and
i
applications involving female speakers or children, languages
w(f) = 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 Methods E 1111, E 1375 and E 1376 . In Test
transmitted noise from machinery, industrial processes, bowl-
Methods E 1111, E 1375 and E 1376 interzone attenuation is
ing alleys, music rooms, places of entertainment, and the like.
substituted for sound attenuation.
NOTE 1—Recently published work by Pearsons, et al, may eventually
3
permit the restriction on female speakers to be relaxed.
4. Significance and Use
4.1 Each weighting factor given in Table 1 represents the
2. Referenced Documents
fraction of overall speech intelligence contained within the
2.1 ASTM Standards:
associated one-third octave frequency band.
4
C 634 Terminology Relating to Environmental Acoustics
4.2 The weighting factors in Table 1 are obtained by
E 1111 Test Method for Measuring the Interzone Attenua-
multiplying each individual one-third octave band weighting
4
tion of Ceiling Systems
factor ofANSI S3.5 by 300.Articulation class (AC) values are
E 1375 Test Method for Measuring the Interzone Attenua-
thus related to but distinctly different from articulation index
5
tion of Furniture Panels Used as Acoustical Barriers
(AI) values. In particular, the AC considers only the effect of
E 1376 Test Method for Measuring the Interzone Attenua-
signal attenuation; while the AI considers such additional
tion of Sound Reflected by Wall Finishes and Furniture
factors as speech level and spectrum and background sound
5
Panels
level and spectrum.
2.2 ANSI Standard:
7
6
NOTE 2—The AC is similar to the DAI rating proposed by Warnock
S3.5 Methods for the Calculation of theArticulation Index
and has been shown to correlate withAI values derived fromANSI S3.5,
except where the AI approaches 1 or 0 (AI values range between 1 and 0
3. Summary of Classification
and approach 0 with increasing privacy and nonintelligibility). Articula-
3.1 Articulationclass(AC)isthesumoftheweighted
...