ASTM E1110-06
(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.
General Information
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Standards Content (Sample)
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Designation: E1110 – 06
Standard Classification for
1
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
where:
f = the center frequency of the bands from 200 to 5000
1.1 This classification provides a single figure rating that
i
Hz,
can be used for comparing building systems and subsystems
A(f) = the measured attenuation in decibels in the one-
for speech privacy purposes.The rating is designed to correlate i
third octave band with center frequency f, and
with transmitted speech intelligence between office spaces. i
w(f) = the weighting for that band, from Table 1.
i
1.2 Excluded from the scope of this classification are
2
3.2 The sound attenuation for each band is determined in
applications involving female speakers or children, languages
accordance with Test Method E1111. In Test Method E1111
other than English, and sound spectra other than speech. Thus
interzone attenuation is substituted for sound attenuation.
excluded, for example, would be comparisons of building
systems or subsystems for their effectiveness in reducing
4. Significance and Use
transmitted noise from machinery, industrial processes, bowl-
4.1 Each weighting factor given in Table 1 represents the
ing alleys, music rooms, places of entertainment, and the like.
fraction of overall speech intelligence contained within the
NOTE 1—Published work by Pearsons, et al, may eventually permit the
associated one-third octave frequency band.
3
restriction on female speakers to be relaxed.
4.2 The weighting factors in Table 1 are obtained by
multiplying each individual one-third octave band weighting
2. Referenced Documents
factor of ANSI S3.5-1969 by 300. Articulation class (AC)
4
2.1 ASTM Standards:
values are thus related to but distinctly different from articu-
E1111 TestMethodforMeasuringtheInterzoneAttenuation
lation index (AI) values. In particular, the AC considers only
of Open Office Components
the effect of signal attenuation; while the AI considers such
2.2 ANSI Standard:
additional factors as speech level and spectrum and back-
S3.5 –1969 Methods for the Calculation of the Articulation
ground sound level and spectrum.
5
Index
6
NOTE 2—The AC is similar to the DAI rating proposed by Warnock
3. Summary of Classification
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
3.1 Articulationclass(AC)isthesumoftheweightedsound
and approach 0 with increasing privacy and nonintelligibility). Articula-
attenuations in a series of 15 test bands. It is calculated as
tion class values give the reverse. They usually exceed 100 and increase
follows:
with increasing privacy and nonintelligibility. Extensive comparison
betweenACratingsandsubjectivejudgmentsofopen-planspeechprivacy
AC 5 A~f !w~f ! (1)
( i i
f
i
has not yet been accomplis
...
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