1、Designation: E 1110 06Standard Classification forDetermination of Articulation Class1This standard is issued under the fixed designation E 1110; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in
2、 parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 privacy purposes. T
3、he 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 example, would be
4、 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 female speaker
5、s to be relaxed.32. Referenced Documents2.1 ASTM Standards:4E 1111 Test Method for Measuring the Interzone Attenua-tion of 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 sum of the
6、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 weighting for that
7、band, from Table 1.3.2 The sound attenuation for each band is determined inaccordance with Test Method E 1111. In Test Method E 1111interzone attenuation is substituted for sound attenuation.4. Significance and Use4.1 Each weighting factor given in Table 1 represents thefraction of overall speech in
8、telligence 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 different from ar
9、ticu-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 shown to
10、 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 nonintel
11、ligibility. 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 sound attenu
12、ation 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 Committee E33 on
13、EnvironmentalAcoustics and is the direct responsibility of Subcommittee E33.02 onOpen Plan Spaces .Current edition approved Sept. 1, 2006. Published September 2006. Originallyapproved in 1986. Last previous edition approved in 2001 as E 1110-01.2This is based on a similar exclusion in ANSI S3.5.-196
14、9 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, www.astm.org, orcontact ASTM Customer Service
15、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, http:/www.ansi.org.6Warnock, A. C. C., “Studi
16、es 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 takes no position respecting the validity of any pa
17、tent 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 responsibility.This standard is subject to revisio
18、n 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 addressed to ASTM International Headquarters. Your com
19、ments 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 address shown below.This standard is copyright
20、ed 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 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).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 0.60E1110062
