ASTM E1110-06(2011)
(Classification)Standard Classification for Determination of Articulation Class
Standard Classification for Determination of Articulation Class
SIGNIFICANCE AND USE
Each weighting factor given in Table 1 represents the fraction of overall speech intelligence contained within the associated one-third octave frequency band.
The weighting factors in Table 1 are obtained by multiplying each individual one-third octave band weighting factor of ANSI S3.5-1969 by 300. Articulation class (AC) values are thus related to but distinctly different from articulation index (AI) values. In particular, the AC considers only the effect of signal attenuation; while the AI considers such additional factors as speech level and spectrum and background sound level and spectrum.
Note 2—The AC is similar to the DAI rating proposed by Warnock6 and has been shown to correlate with AI values derived from ANSI S3.5, except where the AI approaches 1 or 0 (AI values range between 1 and 0 and approach 0 with increasing privacy and nonintelligibility). Articulation class values give the reverse. They usually exceed 100 and increase with increasing privacy and nonintelligibility. Extensive comparison between AC ratings and subjective judgments of open-plan speech privacy has not yet been accomplished.
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. Published work by Pearsons, et al, may eventually permit the restriction on female speakers to be relaxed.
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Standards Content (Sample)
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Designation:E1110 −06 (Reapproved 2011)
Standard Classification for
Determination of Articulation Class
This standard is issued under the fixed designation E1110; 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
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-third
i
1.2 Excluded from the scope of this classification are
octave band with center frequency f, and
2 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 Test Method E1111. In Test Method E1111
systems or subsystems for their effectiveness in reducing
interzone attenuation is substituted for sound attenuation.
transmitted noise from machinery, industrial processes, bowl-
ing alleys, music rooms, places of entertainment, and the like.
4. Significance and Use
NOTE 1—Published work by Pearsons, et al, may eventually permit the
restriction on female speakers to be relaxed.
4.1 Each weighting factor given in Table 1 represents the
fraction of overall speech intelligence contained within the
2. Referenced Documents
associated one-third octave frequency band.
2.1 ASTM Standards:
4.2 The weighting factors in Table 1 are obtained by
E1111 Test Method for Measuring the InterzoneAttenuation
multiplying each individual one-third octave band weighting
of Open Office Components
factor of ANSI S3.5-1969 by 300. Articulation class (AC)
2.2 ANSI Standard:
values are thus related to but distinctly different from articu-
S3.5 –1969 Methods for the Calculation of the Articulation lation index (AI) values. In particular, the AC considers only
Index
the effect of signal attenuation; while the AI considers such
additional factors as speech level and spectrum and back-
3. Summary of Classification
ground sound level and spectrum.
3.1 Articulationclass(AC)isthesumoftheweightedsound 6
NOTE 2—The AC is similar to the DAI rating proposed by Warnock
attenuations in a series of 15 test bands. It is calculated as
and has been shown to correlate with AI values derived from ANSI S3.5,
except where the AI approaches 1 or 0 (AI values range between 1 and 0
follows:
and approach 0 with increasing privacy and nonintelligibility). Articula-
tion class values give the reverse. They usually exceed 100 and increase
with increasing privacy and nonintelligibility. Extensive comparison
This classification is under the jurisdiction of ASTM Committee E33 on
betweenACratingsandsubjectivejudgmentsofopen-planspeechprivacy
Building and
...
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