1、Designation: E1110 06 (Reapproved 2011)Standard Classification forDetermination of Articulation Class1This standard is issued under the fixed designation E1110; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This classification provides a single figure rating thatcan be used for comparing building systems and subsystemsfor speech priv
3、acy purposes. The rating is designed to correlatewith transmitted speech intelligence between office spaces.1.2 Excluded from the scope of this classification areapplications involving female speakers or children,2languagesother than English, and sound spectra other than speech. Thusexcluded, for ex
4、ample, would be comparisons of buildingsystems or subsystems for their effectiveness in reducingtransmitted noise from machinery, industrial processes, bowl-ing alleys, music rooms, places of entertainment, and the like.NOTE 1Published work by Pearsons, et al, may eventually permit therestriction on
5、 female speakers to be relaxed.32. Referenced Documents2.1 ASTM Standards:4E1111 Test Method for Measuring the InterzoneAttenuationof Open Office Components2.2 ANSI Standard:S3.5 1969 Methods for the Calculation of the ArticulationIndex53. Summary of Classification3.1 Articulation class (AC) is the
6、sum of the weighted soundattenuations in a series of 15 test bands. It is calculated asfollows:AC 5(fiAfi!wfi! (1)where:fi= the center frequency of the bands from 200 to 5000Hz,A(fi) = the measured attenuation in decibels in the one-third octave band with center frequency fi, andw(fi) = the weightin
7、g for that band, from Table 1.3.2 The sound attenuation for each band is determined inaccordance with Test Method E1111. In Test Method E1111interzone attenuation is substituted for sound attenuation.4. Significance and Use4.1 Each weighting factor given in Table 1 represents thefraction of overall
8、speech intelligence contained within theassociated one-third octave frequency band.4.2 The weighting factors in Table 1 are obtained bymultiplying each individual one-third octave band weightingfactor of ANSI S3.5-1969 by 300. Articulation class (AC)values are thus related to but distinctly differen
9、t from articu-lation index (AI) values. In particular, the AC considers onlythe effect of signal attenuation; while the AI considers suchadditional factors as speech level and spectrum and back-ground sound level and spectrum.NOTE 2The AC is similar to the DAI rating proposed by Warnock6and has been
10、 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 0and approach 0 with increasing privacy and nonintelligibility). Articula-tion class values give the reverse. They usually exceed 100 and increasewith increasing privacy and
11、 nonintelligibility. Extensive comparisonbetweenAC ratings and subjective judgments of open-plan speech privacyhas not yet been accomplished.5. Presentation of Results5.1 The AC shall be reported to the nearest multiple of ten.It is recommended that the AC be reported together with theunweighted sou
12、nd attenuation for each test frequency band andother data required for the appropriate sound attenuation testmethod.6. Keywords6.1 architectural acoustics; articulation class; open office;open-plan space; sound attenuation; speech privacy1This classification is under the jurisdiction of ASTM Committ
13、ee E33 onBuilding and Environmental Acoustics and is the direct responsibility of Subcom-mittee E33.02 on Open Plan Spaces .Current edition approved Nov. 1, 2011. Published December 2011. Originallyapproved in 1986. Last previous edition approved in 2006 as E1110-06. DOI:10.1520/E1110-06R11.2This is
14、 based on a similar exclusion in ANSI S3.5.-1969 which is no longerpublished.3Pearsons, K. S., Bennett, R. L., and Fidell, S., “Speech Levels in Various NoiseEnvironments,” National Technical Information Service Research Report, PB-270053, 1977.4For referenced ASTM standards, visit the ASTM website,
15、 www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.5No longer available from American National Standards Institute (ANSI), 25 W.43rd St., 4th Floor, New York, NY 10036
16、 http:/www.ansi.org.6Warnock, A. C. C., “Studies of Acoustical Parameters in Open-Plan Offices,”Journal, Acoustical Society of America, Vol 63, 1978, pp. 832840.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM International take
17、s no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own res
18、ponsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be address
19、ed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the
20、 address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (pho
21、ne), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Weighting Factor, for Calculation of Articulation ClassBand Center Frequency, Hz Weighting Factor200 0.12250 0.30315 0.30400 0.42500 0.42630 0.60800 0.601000 0.721250 0.901600 1.112000 1.142500 1.023150 1.024000 0.725000 0.60E1110 06 (2011)2
