1、g44g40g40g40g3g54g87g71g3g20g22g21g28g140g16g21g19g20g19g11g53g72g89g76g86g76g82g81g3g82g73g44g40g40g40g3g54g87g71g3g20g22g21g28g16g20g28g28g28g12g44g40g40g40g3g54g87g68g81g71g68g85g71g3g48g72g87g75g82g71g3g73g82g85g48g72g68g86g88g85g76g81g74g3g55g85g68g81g86g80g76g86g86g76g82g81g3g51g72g85g73g82g85
2、g80g68g81g70g72g3g82g73g54g83g72g68g78g72g85g83g75g82g81g72g86g44g40g40g40g3g38g82g80g80g88g81g76g70g68g87g76g82g81g86g3g54g82g70g76g72g87g92g3g54g83g82g81g86g82g85g72g71g3g69g92g3g87g75g72g55g85g68g81g86g80g76g86g86g76g82g81g15g3g36g70g70g72g86g86g15g3g68g81g71g3g50g83g87g76g70g68g79g3g54g92g86g87g
3、72g80g86g3g38g82g80g80g76g87g87g72g72g44g40g40g40g22g3g51g68g85g78g3g36g89g72g81g88g72g3g49g72g90g3g60g82g85g78g15g3g49g60g3g20g19g19g20g25g16g24g28g28g26g15g3g56g54g36g3g3g20g24g3g50g70g87g82g69g72g85g3g21g19g20g19g20g22g21g28g55g48IEEE Std 1329-2010 (Revision of IEEE Std 1329-1999) IEEE Standard M
4、ethod for Measuring Transmission Performance of Speakerphones Sponsor Transmission, Access, and Optical Systems Committee of the IEEE Communications Society Approved 17 June 2010 IEEE-SA Standards Board Approved 4 January 2011 American National Standards Institute Abstract: This standard provides te
5、chniques for objective measurement of electroacoustic and voice-switching characteristics of speakerphones that connect directly or indirectly to an analog or digital telephone network. Due to the various characteristics of speakerphones and the environments in which they operate, not all of the tes
6、t procedures in this standard are applicable to all speakerphones. Application of the test procedures to atypical speakerphones should be determined on an individual basis. Keywords: full duplex, half duplex, handsfree, speakerphone, voice switching The Institute of Electrical and Electronics Engine
7、ers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2010 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 15 October 2010. Printed in the United States of America. IEEE is a registered trademark in the U.S. Patent +1 978 750 8400. Permission t
8、o photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. iv Copyright 2010 IEEE. All rights reserved. Introduction This introduction is not part of IEEE Std 1329-2010, IEEE Standard Method for Measuring Transmission Pe
9、rformance of Speakerphones. This standard has been developed in response to a widely expressed need by the telecommunications industry for a standard, comprehensive method for testing the transmission performance of speakerphone telephone sets. This standard is generally in agreement with the Intern
10、ational Telecommunication UnionTelecommunication Standardization Sector (ITU-T) test arrangements and calibration procedures. The IEEE will maintain this standard current with the state of the technology. Comments on this standard and suggestions for the additional material that should be included a
11、re invited. Comments should be addressed to the Secretary, IEEE Standards Board, The Institute of Electrical and Electronics Engineers, Inc., 445 Hoes Lane, Piscataway, NJ 08854. This standard began in 1992 and was prepared by the Subcommittee on Telephone Instrument Testing of the Transmission, Acc
12、ess, and Optical Systems Committee of the IEEE Communications Society (formerly the IEEE Communications Technology Group). It was originally published in 1999 and has been updated in this 2010 edition to reflect current telecommunications technology. Notice to users Laws and regulations Users of the
13、se documents should consult all applicable laws and regulations. Compliance with the provisions of this standard does not imply compliance to any applicable regulatory requirements. Implementers of the standard are responsible for observing or referring to the applicable regulatory requirements. IEE
14、E does not, by the publication of its standards, intend to urge action that is not in compliance with applicable laws, and these documents may not be construed as doing so. Copyrights This document is copyrighted by the IEEE. It is made available for a wide variety of both public and private uses. T
15、hese include both use, by reference, in laws and regulations, and use in private self-regulation, standardization, and the promotion of engineering practices and methods. By making this document available for use and adoption by public authorities and private users, the IEEE does not waive any right
16、s in copyright to this document. Updating of IEEE documents Users of IEEE standards should be aware that these documents may be superseded at any time by the issuance of new editions or may be amended from time to time through the issuance of amendments, corrigenda, or errata. An official IEEE docum
17、ent at any point in time consists of the current edition of the document together with any amendments, corrigenda, or errata then in effect. In order to determine whether a given document is the current edition and whether it has been amended through the issuance of amendments, corrigenda, or errata
18、, visit the IEEE Standards Association web site at http:/ieeexplore.ieee.org/xpl/standards.jsp, or contact the IEEE at the address listed previously. v Copyright 2010 IEEE. All rights reserved. For more information about the IEEE Standards Association or the IEEE standards development process, visit
19、 the IEEE-SA web site at http:/standards.ieee.org. Errata Errata, if any, for this and all other standards can be accessed at the following URL: http:/standards.ieee.org/reading/ieee/updates/errata/index.html. Users are encouraged to check this URL for errata periodically. Interpretations Current in
20、terpretations can be accessed at the following URL: http:/standards.ieee.org/reading/ieee/interp/ index.html. Patents Attention is called to the possibility that implementation of this standard method may require use of subject matter covered by patent rights. By publication of this standard method,
21、 no position is taken with respect to the existence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying patents or patent applications for which a license may be required to implement an IEEE standard or for conducting inquiries into the legal
22、validity or scope of those patents that are brought to its attention. Participants At the time this standard method was submitted to the IEEE-SA Standards Board for approval, the Telephone Instrument Testing Working Group had the following membership: John R. Bareham, Chair Glenn Hess, Vice-chair Al
23、 Baum Cliff Chamney Miguel Dearaujo Dan Foley Steve Graham Fred Kruger Ron D. Magnuson Scott Pennock Tony Scott Hong Sodoma Christopher J. Struck Stephen R. Whitesell Allen Woo Bob Young The following members of the individual balloting committee voted on this standard method. Balloters may have vot
24、ed for approval, disapproval, or abstention. John R. Bareham Hugh Barrass Al Baum H. Stephen Berger Cliff Chamney Keith Chow Miguel De Araujo Carlo Donati Sourav Dutta Steve Graham Randall Groves Glenn Hess Werner Hoelzl Akio Iso Piotr Karocki Fred Kruger G. Luri Ron D. Magnuson Gary Michel Michael
25、Newman Gary Nissen Scott Pennock Venkatesha Prasad Bartien Sayogo vi Copyright 2010 IEEE. All rights reserved. Jeffrey Schenck Tony Scott Peretz Shekalim Gil Shultz Christopher J. Struck Mitsutoshi Sugawara Stephen R. Whitesell Allen Woo Oren Yuen When the IEEE-SA Standards Board approved this metho
26、d on 17 June 2010, it had the following membership: Robert M. Grow, Chair Richard H. Hulett, Vice Chair Steve M. Mills, Past Chair Judith Gorman, Secretary Karen Bartleson Victor Berman Ted Burse Clint Chaplin Andy Drozd Alexander Gelman Jim Hughes Young Kyun Kim Joseph L. Koepfinger* John Kulick Da
27、vid J. Law Hung Ling Oleg Logvinov Ted Olsen Ronald C. Petersen Thomas Prevost Jon Walter Rosdahl Sam Sciacca Mike Seavey Curtis Siller Don Wright *Member Emeritus Also included are the following nonvoting IEEE-SA Standards Board liaisons: Satish Aggarwal, NRC Representative Richard DeBlasio, DOE Re
28、presentative Michael Janezic, NIST Representative Catherine Berger IEEE Standards Program Manager, Document Development Matthew Ceglia IEEE Standards Program Manager, Technical Program Development vii Copyright 2010 IEEE. All rights reserved. Contents 1. Overview 1 1.1 General 1 1.2 Scope . 1 1.3 Pu
29、rpose 2 1.4 Contents of standard 2 2. Normative references 2 3. Definitions 3 4. Abbreviations, acronyms, and symbols 8 5. Test equipment, environment, and impairments. 11 5.1 General 11 5.2 Test equipment 11 5.3 Test environment . 12 5.4 Impairments. 16 6. Test calibration . 17 6.1 Electrical test
30、signal calibration. 17 7. Transmission measurements. 18 7.1 General 18 7.2 Choice of measurement transducers 20 7.3 Positioning of speakerphone and test transducers 21 7.4 Test position guidelines . 22 7.5 Receive 27 7.6 Send . 34 7.7 Echo path response 39 8. Voice-switching time (half-duplex) measu
31、rements 42 8.1 General 42 8.2 Classification . 43 8.3 Switching parameters 43 8.4 Test conditions. 44 8.5 Test parameters 45 9. Acoustic echo control (full- or half-duplex) measurements . 52 9.1 General 52 9.2 Test signals 53 9.3 Test conditions. 53 9.4 Round-trip EPD . 53 9.5 TCLsingle-talk. 54 9.6
32、 Convergence time (TC) 54 9.7 Temporally weighted terminal coupling loss during double-talk (TCLTDT) 55 9.8 Receive speech attenuation during double-talk (ARDT) 55 9.9 Send speech attenuation during double-talk (ASDT). 56 9.10 Receive speech front-end clipping time during double-talk (TRFDT) 57 viii
33、 Copyright 2010 IEEE. All rights reserved. 9.11 Send speech front-end clipping time during double-talk (TSFDT). 57 Annex A (normative) Recommended test bed 58 A.1 Example implemented test hybrid 58 A.2 Example adaptive echo canceller 58 Annex B (normative) Detailed test methodology for TCLT. 64 B.1
34、General 64 B.2 Temporally weighted terminal coupling loss (TCLT) . 64 B.3 Modeling echo audibility 65 B.4 Expressing TCL results. 66 Annex C (normative) TCLTtest algorithm. 68 C.1 General 68 C.2 TCLTalgorithm. 69 Annex D (normative) Double-talk testing 72 D.1 General 72 D.2 Canceller training prior
35、to double-talk 72 D.3 Double-talk source signals 74 D.4 Double-talk attenuation testing. 76 D.5 Double-talk front-end syllabic clipping testing 78 D.6 Double-talk terminal coupling testing 79 D.7 Double-talk measurement filters. 80 Annex E (informative) Microphones 82 Annex F (normative) Power and a
36、mplitude summations . 83 F.1 Power summation of a spectrum . 83 F.2 Adding spectra on a “power” basis 83 F.3 Averaging spectra on a “power” basis. 84 F.4 Adding spectra on an “amplitude” basis 85 Annex G (normative) Preferred listening levels. 87 G.1 Objectives . 87 G.2 Apparatus 87 G.3 Procedure 87
37、 G.4 Comments about results 88 G.5 Acceptance of speech levels for three levels of room noise . 88 Annex H (normative) Multiple send and receive frequency response test positions 90 Annex I (informative) Bibliography. 91 1 Copyright 2010 IEEE. All rights reserved. IEEE Standard Method for Measuring
38、Transmission Performance of Speakerphones IMPORTANT NOTICE: This standard is not intended to ensure safety, security, health, or environmental protection. Implementers of the standard are responsible for determining appropriate safety, security, environmental, and health practices or regulatory requ
39、irements. This IEEE document is made available for use subject to important notices and legal disclaimers. These notices and disclaimers appear in all publications containing this document and may be found under the heading “Important Notice” or “Important Notices and Disclaimers Concerning IEEE Doc
40、uments.” They can also be obtained on request from IEEE or viewed at http:/standards.ieee.org/IPR/disclaimers.html. 1. Overview 1.1 General Objective or subjective methods can be used to measure speakerphone transmission performance. This standard discusses objective procedures utilizing a sound sou
41、rce, laboratory microphone, and test instruments to characterize transmission performance. Subjective methods are particularly applicable for rating overall communication connections involving the real voice and real ear of human subjects. Speakerphones can be evaluated by purely objective methods p
42、rovided the methods agree with the desirable performance characteristics of subjective testing. It is a complex problem to obtain accurate and repeatable speakerphone test results. To meet these measurement goals, the reader should be aware of the nonlinear and time-variant characteristics of speake
43、rphones. This standard describes test signals and corresponding analysis methods that can be chosen to place the speakerphone is in a well-defined operating state during testing. Execution of this standard provides a means of determining the operational characteristics of a speakerphone in condition
44、s encountered during normal operation. 1.2 Scope This standard provides techniques for objective measurement of electroacoustic and voice-switching characteristics of speakerphones that connect directly or indirectly to an analog or digital telephone network. Due to the various characteristics of sp
45、eakerphones and the environments in which they operate, IEEE Std 1329-2010 IEEE Standard Method for Measuring Transmission Performance of Speakerphones 2 Copyright 2010 IEEE. All rights reserved. not all of the test procedures in this standard are applicable to all speakerphones. Application of the
46、test procedures to atypical speakerphones should be determined on an individual basis. 1.3 Purpose The purpose of this standard is to provide practical methods for making laboratory measurements of the transmission and voice-switching characteristics of speakerphones so that their performance may be
47、 evaluated on a standardized basis. 1.4 Contents of standard This subclause offers a summary of the clauses contained in the standard. The primary measurement procedures appear in Clause 6 through Clause 9. Annexes contain additional information or details of procedures referred to by relevant claus
48、es. Clause 2, Clause 3, and Clause 4 provide references, definitions, and abbreviations useful in executing the tests of this standard. These clauses provide background in the terminology used for speakerphone testing. Clause 5 details test equipment, test environment, and impairments. Test equipmen
49、t includes interfaces and transducers. A test environment includes both the acoustical and physical characteristics of the test space. Impairments include both acoustic and network conditions. Clause 6 details the calibration procedures needed to verify that the equipment is in a known state. Calibration of the electrical interfaces and acoustic transducers is explained. Clause 7 details send, receive, and other transmission test procedures. This clause includes procedures for positioning the speakerphone for testing. Clause 8 details procedures and parameters involved
