1、Designation: E1179 13Standard Specification forSound Sources Used for Testing Open Office Componentsand Systems1This standard is issued under the fixed designation E1179; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. 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 specification states the requirements for soundsources used for measuring the speech privacy between openoffices
3、and for measuring the laboratory performance ofacoustical components (see Test Methods E1111 and E1130).1.2 The sound source shall be a loudspeaker located in anenclosure driven with an appropriate test signal.1.3 This specification describes the sound source andmethod of qualifying it using a speci
4、al qualification signal. Testsignals required by open office test methods may differ.1.4 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.2. Referenced Documents2.1 ASTM Standards:2C384 Test Method for Impedance and Absorption of
5、 Acous-tical Materials by Impedance Tube MethodC634 Terminology Relating to Building and EnvironmentalAcousticsE1050 Test Method for Impedance and Absorption ofAcoustical Materials Using a Tube, Two Microphones anda Digital Frequency Analysis SystemE1111 Test Method for Measuring the Interzone Atten
6、uationof Open Office ComponentsE1130 Test Method for Objective Measurement of SpeechPrivacy in Open Plan Spaces Using Articulation Index2.2 ANSI Standards:3S1.4 Specification for Sound Level MetersS1.6 Preferred Frequencies, Frequency Levels, and BandNumbers for Acoustical MeasurementsS1.11 Specific
7、ation for Octave Band and Fractional OBAnalog and Digital FiltersS1.43 Specifications for Integrating-Averaging Sound LevelMeters2.3 IEC Standards:461260 ElectroacousticsOctave and fractional-octave bandfilters616721 ElectroacousticsSound Level MetersPart 1:Specifications3. Terminology3.1 Definition
8、s:3.1.1 The acoustical terminology used in this specificationis consistent with Terminology C634.3.2 Definitions of Terms Specific to This Standard:3.2.1 directivity measurementthe measurement used todetermine directivity as defined in 4.2.3.2.2 qualification signala test signal of broadband noiseor
9、 bands of white or pink noise as defined in TerminologyC634.3.2.3 source pointthe point at which the loudspeaker axisintersects the front plane of the loudspeaker (see Fig. 1).3.3 The following terms in this standard have specificmeanings that are defined in Terminology C634:3.3.1 background noise,3
10、.3.2 pink noise,3.3.3 sound pressure level, and3.3.4 white noise4. Sound Source Specifications4.1 Sound Source DescriptionThe sound source shall be aloudspeaker enclosed in a box that has a maximum dimensionof 0.30 m on a side.4.2 DirectivityWith the source driven with the qualifica-tion signal, the
11、 maximum and minimum sound pressure levelsof any one-third octave band, from 200 to 3150 Hz measured1This specification 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 ap
12、proved Aug. 1, 2013. Published October 2013. Originallyapproved in 1987. Last previous edition approved in 2011 as E1179 11. DOI:10.1520/E1179-13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards
13、 volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.4Available from International Electrotechnical Commission (IEC), 3, rue deVaremb, P.O. B
14、ox 131, CH-1211 Geneva 20, Switzerland, http:/www.iec.ch.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1at a distance of 1.0 m from the source point, at any angle up toand including 25 in any direction from the loudspeaker axis,shall
15、 differ by no more than 2 dB. At frequencies above 3150Hz, the difference shall be no more than 3dB.NOTE 1At angles beyond 25 from the loudspeaker axis, the sourcemay produce lower sound pressure levels than within the 50 includedangle.NOTE 2The directivity requirement may be met by using more thano
16、ne loudspeaker, each one used separately to cover a different portion ofthe test frequency range.5. Source Qualification5.1 Test EnvironmentThe measurements shall be carriedout in a sound field, essentially free of acoustical reflections.The preferred test environment is an anechoic room withsurface
17、s that have a minimum normal incidence sound absorp-tion coefficient of 0.990 at all frequencies above 175 Hz asmeasured in accordance with Test Methods C384 or E1050 or,by the use of other methods, can be shown to be essentiallyanechoic between 200 Hz and 5000 Hz. Alternatively, anoutdoor environme
18、nt may be used if it is shown that soundreflections do not influence the data. (See also, Section 6.)5.2 Test Instruments:5.2.1 The measurement system used to measure soundpressure levels shall satisfy the accuracy requirements ofANSIS1.4, ANSI S1.43, or IEC 61672-1 Type 1 sound level metersexcept t
19、hat weighting networks are not required.5.2.2 The microphone shall meet the requirements of eitherIEC 616721 or ANSI S1.4, or ANSI S1.43. For microphonesmeeting ANSI S1.4, the microphone shall be oriented so thesound in incident on the microphone at the calibration angle ofincidence for the micropho
20、ne. For microphones meeting IEC616721, the microphone shall be oriented so the sound isincident on the microphone from the reference direction.5.2.3 One-third octave filters shall meet the requirements ofANSI S1.11 for Class III, Type R or Type E filters or IEC61260.5.3 Qualification Sound OutputWhe
21、n the sound source isdriven with the qualification signal, the sound output shall beadequate to maintain one-third octave-band sound pressurelevels at least 10 dB above the corresponding background noisein each band at each measurement location.NOTE 3Sources which produce anA-weighted sound level of
22、 70 to 90dB at 1 m when driven with broadband noise usually meet this require-ment.NOTE 4The background noise consists of the ambient noise and theinternal noise of the measuring instruments, as defined in TerminologyC634.5.4 Directivity MeasurementThe directivity of the soundsource shall be verifie
23、d by driving the source with thequalification signal and measuring the sound pressure levels atmeasurement points that include those shown in Fig. 1. Themicrophone shall be oriented such that the angle between theaxis of the microphone and the line connecting the center of themicrophone diaphragm an
24、d the center of the loudspeaker is thesame for each measurement. This shall be carried out for eachone-third octave with midband frequencies from 200 to 5000Hz defined in ANSI S1.6 or IEC 61260. At a minimum, thedata shall be obtained at seven measurement points in each oftwo perpendicular planes, s
25、uch as the horizontal and verticalplanes, at a distance of 1 m from the source point.5.5 The source shall be characterized per 5.4 prior to firstuse and after repair or replacement of any component in thespeakers that can affect directivity.6. Space Qualifications6.1 Draw way testTo determine the ac
26、ceptability of thespace used to verifying directivity (5.4) do the following:6.1.1 Place the sound source near the center of space at least2 m from any horizontal or vertical surface.6.1.2 Excite the source with random noise over the range of200 to 5 000 Hz.6.1.3 Measure at two locations, 1 m from t
27、he source pointand 1.5 m from the source point, along the following axes:FIG. 1 Measurement Points for Sound Source DirectivityE1179 1326.1.3.1 Directly in front of the source, and6.1.3.2 At a 6 25 angle from the loudspeaker axis in bothvertical and horizontal planes6.1.4 For each set of measurement
28、s, measure the one-thirdoctave band 10s average sound pressure level over the fre-quency range of interest.6.1.5 For each axis measured, subtract the sound pressurelevel at the 1.5 m point from that at the 1 m point.6.1.6 The difference shall be 3.5 dB 60.5 dB for each andevery13rdoctave band for th
29、e room to be considered adequate.6.2 Other methods:6.2.1 Any other method can be used to qualify the spacesuch that it can be shown the method yields results equivalentto that above.7. Qualification Report7.1 A report shall be made available providing the qualifi-cation test data for sources that me
30、et this specification.8. Keywords8.1 loudspeaker; open office; open office components; openoffice components and systems; sound; sound source directiv-ity; sound sourcesASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin
31、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 revision at any time by the responsible technical committee and must
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33、esponsible 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 copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700,
34、 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).E1179 133
