1、Designation:E111006(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 revision.A
2、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 privacy purpose
3、s.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 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.NOTE1Published work by Pearsons,et al,may eventually permit therestriction on female speakers to be r
5、elaxed.32.Referenced Documents2.1 ASTM Standards:4E1111 Test Method for Measuring the Interzone Attenuationof 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 weighted soundat
6、tenuations in a series of 15 test bands.It is calculated asfollows:AC5(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-thirdoctave band with center frequency fi,andw(fi)=the weighting for that band,from Table 1.3.2 The
7、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 speech intelligence contained within the
8、associated 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 articu-lation index(AI)values.In pa
9、rticular,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.NOTE2The AC is similar to the DAI rating proposed by Warnock6and has been shown to correlate with AI values derived from
10、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 nonintelligibility.Extensive comparisonbetweenAC r
11、atings 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 attenuation for each test frequency band andother
12、data required for the appropriate sound attenuation testmethod.1This classification is under the jurisdiction of ASTM Committee E33 onBuilding and Environmental Acoustics and is the direct responsibility of Subcom-mittee E33.02 on Speech Privacy.Current edition approved Nov.1,2011.Published December
13、 2011.Originallyapproved in 1986.Last previous edition approved in 2006 as E1110-06.DOI:10.1520/E1110-06R11.2This is 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 I
14、nformation Service Research Report,PB-270053,1977.4For referenced ASTM standards,visit the ASTM website,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 avail
15、able fromAmerican National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,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.Copyright ASTM International,100 Barr Harbor Drive,PO
16、Box C700,West Conshohocken,PA 19428-2959.United States1 6.Keywords6.1 architectural acoustics;articulation class;open office;open-plan space;sound attenuation;speech privacyASTM International takes 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 responsibi
