1、g44g40g40g40g3g54g87g71g3g21g25g28g140g16g21g19g20g19g11g53g72g89g76g86g76g82g81g3g82g73g44g40g40g40g3g54g87g71g3g21g25g28g16200g21g12g44g40g40g40g3g54g87g68g81g71g68g85g71g3g48g72g87g75g82g71g86g3g73g82g85g48g72g68g86g88g85g76g81g74g3g55g85g68g81g86g80g76g86g86g76g82g81g51g72g85g73g82g85g80g68g81g7
2、0g72g3g82g73g3g36g81g68g79g82g74g3g68g81g71g3g39g76g74g76g87g68g79g55g72g79g72g83g75g82g81g72g3g54g72g87g86g15g3g43g68g81g71g86g72g87g86g15g3g68g81g71g43g72g68g71g86g72g87g86g3g44g40g40g40g3g38g82g80g80g88g81g76g70g68g87g76g82g81g86g3g54g82g70g76g72g87g92g3g54g83g82g81g86g82g85g72g71g3g69g92g3g87g75
3、g72g55g85g68g81g86g80g76g86g86g76g82g81g3g36g70g70g72g86g86g3g9g3g50g83g87g76g70g68g79g3g54g92g86g87g72g80g86g3g38g82g80g80g76g87g87g72g72g44g40g40g40g22g3g51g68g85g78g3g36g89g72g81g88g72g3g49g72g90g3g60g82g85g78g15g3g49g60g3g20g19g19g20g25g16g24g28g28g26g15g3g56g54g36g3g326g3Augustg3g21g19g20g19g21
4、g25g28g55g48IEEE Std 269-2010 (Revision of IEEE Std 269-2002) IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets Sponsor Transmission Access +1 978 750 8400. Permission to photocopy portions of any individual standard for educati
5、onal 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 269-2010, IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, a
6、nd Headsets. This standard has been prepared in response to a widely expressed need by the telecommunications industry for a standard, comprehensive method for testing the transmission performance of telephone sets, handset, and headsets. The present standard is a revision of IEEE Std 269-2002. This
7、 revision adds coverage for a wide range of ear simulators and test signals, and incorporates and updates the contents of IEEE Std 1206-1994. Notice to users Laws and regulations Users of these documents should consult all applicable laws and regulations. Compliance with the provisions of this stand
8、ard does not imply compliance to any applicable regulatory requirements. Implementers of the standard are responsible for observing or referring to the applicable regulatory requirements. IEEE does not, by the publication of its standards, intend to urge action that is not in compliance with applica
9、ble 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. These include both use, by reference, in laws and regulations, and use in private self-regulation, standardiza
10、tion, 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 rights in copyright to this document. Updating of IEEE documents Users of IEEE standards should be aware that thes
11、e 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 document at any point in time consists of the current edition of the document together with any amendments, corrig
12、enda, 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, visit the IEEE Standards Association web site at http:/ieeexplore.ieee.org/xpl/standards.jsp, or contact th
13、e IEEE at the address listed previously. For more information about the IEEE Standards Association or the IEEE standards development process, visit the IEEE-SA web site at http:/standards.ieee.org. v Copyright 2010 IEEE. All rights reserved. Errata Errata, if any, for this and all other standards ca
14、n 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 interpretations can be accessed at the following URL: http:/standards.ieee.org/reading/ieee/interp/ index.html.
15、 Patents Attention is called to the possibility that implementation of this standard may require use of subject matter covered by patent rights. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in connection therewith. The IEEE is n
16、ot responsible for identifying Essential Patent Claims for which a license may be required, for conducting inquiries into the legal validity or scope of Patents Claims or determining whether any licensing terms or conditions provided in connection with submission of a Letter of Assurance, if any, or
17、 in any licensing agreements are reasonable or non-discriminatory. Users of this standard are expressly advised that determination of the validity of any patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Further information may be obtained from the IEE
18、E Standards Association. Participants At the time this standard was submitted to the IEEE-SA Standards Board for approval, the subcommittee of the Transmission Access & Optical Systems Working Group had the following membership: John Bareham, Chair Glenn Hess, Vice Chair Steve Graham, Secretary Al B
19、aum Clifford Chamney Miguel De Araujo Daniel Foley Frederick Kruger Ron D. Magnuson Anthony Scott Christopher J. Struck Stephen R. Whitesell Allen Woo Robert Young The following members of the individual balloting committee voted on this standard. Balloters may have voted for approval, disapproval,
20、or abstention. John Bareham Hugh Barrass Al Baum Stephen H. Berger Clifford Chamney Keith Chow Miguel De Araujo Carlo Donati Daniel Foley Steve Graham Randall Groves Glenn Hess Werner Hoelzl Raj Jain Piotr Karocki Frederick Kruger G. Luri Gary Michel Michael S. Newman Charles Ngethe Gary Nissen Bart
21、ien Sayogo Jeffrey Schenck Anthony Scott Gil Shultz Christopher J. Struck Stephen R. Whitesell Kwangsee Woo Robert Young Oren Yuenvi Copyright 2010 IEEE. All rights reserved. When the IEEE-SA Standards Board approved this standard on 25 March 2010, it had the following membership: Robert M. Grow, Ch
22、air Rich 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 Richard H. Hulett Young Kyun Kim Joseph L. Koepfinger* John Kulick David J. Law Hung Ling Oleg Logvinov Ted Olsen Ronald C. Pet
23、ersen 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 Representative Michael Janezic, NIST Representative Michelle
24、 D. Turner IEEE Standards Program Manager, Document Development Matthew J. Ceglia IEEE Standards Program Manager, Technical Program Development vii Copyright 2010 IEEE. All rights reserved. Contents 1. Overview 1 1.1 Scope . 2 1.2 Purpose 2 1.3 Contents of standard 2 1.4 Changes since last edition o
25、f this standard 3 2. Normative references 3 3. Definitions, acronyms and abbreviations, symbols 5 3.1 Definitions . 5 3.2 Abbreviations and acronyms . 8 3.3 Symbols . 9 4. Test equipment and setup . 10 4.1 Ear simulators 10 4.2 Mouth simulators. 11 4.3 Test fixtures . 12 4.4 Measurement microphones
26、16 4.5 Test environment . 17 4.6 Acoustic impairments 18 5. Calibration 20 5.1 General 20 5.2 Electrical components and measurement instruments . 20 5.3 Measurement microphones 20 5.4 Ear simulator . 20 5.5 Measurement bandwidth and resolution 20 5.6 Electrical test signals . 20 5.7 Mouth simulator
27、22 6. Test procedure for analog sets 24 6.1 General 24 6.2 Analog DC feed circuits 26 6.3 Analog telephone network impairments 28 6.4 Receive 31 6.5 Send . 34 6.6 Sidetone . 36 6.7 Overall . 38 6.8 Telephone set impedance. 39 6.9 Howling . 40 6.10 Maximum acoustic output . 40 7. Test procedures for
28、digital and 4-wire systems 42 7.1 General 42 7.2 Digital test circuits. 44 7.3 Digital telephone network impairments. 47 7.4 Receive 49 7.5 Send . 52 7.6 Sidetone . 55 7.7 Overall . 57 7.8 Echo frequency response . 58 7.9 Temporally weighted terminal coupling loss. 58 7.10 Stability loss 59 7.11 Con
29、vergence time 60 7.12 Discontinuous speech transmission . 60 7.13 Maximum acoustic output . 61 8. Test procedures for Analog 4-wire handsets and headsets . 63 8.1 General 63 viii Copyright 2010 IEEE. All rights reserved. 8.2 Handset and headset test circuits . 65 8.3 Receive 67 8.4 Send . 70 8.5 Ech
30、o frequency response . 73 8.6 Maximum acoustic output . 74 Annex A (normative) Ear simulators with flexible pinnas and positioning devices. 76 Annex B (normative) Alternative ear simulators, mouth simulator and test fixture. 78 Annex C (normative) DRP to ERP and related translations. 82 Annex D (nor
31、mative) Hoth room noise 85 Annex E (normative) Test signals 87 Annex F (normative) Levels. 98 Annex G (normative) Analysis methods 101 Annex H (normative) Loudness rating calculations . 109 Annex I (normative) Power and voltage summations 111 Annex J (normative) Receive level, conversational gain, a
32、nd frequency response metrics . 116 Annex K (normative) Linearity 121 Annex L (normative) Distortion. 126 Annex M (normative) Send signal-to-noise ratio . 136 Annex N (normative) Delay . 138 Annex O (normative) Sidetone echo 140 Annex P (normative) Maximum acoustic output (long duration)alternate me
33、thod 141 Annex Q (normative) Temporally weighted terminal coupling loss measurment 144 Annex R (normative) Temporally weighted terminal coupling loss algorithm 148 Annex S (normative) Simulated speech generator (SSG). 152 Annex T (normative) TDS sweep with P.50 noise burst 155 Annex U (normative) Co
34、nditioning for carbon transmitters. 156 Annex V (normative) Measurements on telephones with amplified receivers. 157 Annex W (informative) Useful conversion procedures 158 Annex X (informative) Perceptual evaluation of speech quality (PESQ). 160 Annex Y (informative) Loudness balance subjective test
35、 procedures 161 1 Copyright 2010 IEEE. All rights reserved. IEEE Standard for Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets IMPORTANT NOTICE: This standard is not intended to ensure safety, security, health, or environmental protection. I
36、mplementers of the standard are responsible for determining appropriate safety, security, environmental, and health practices or regulatory requirements. This IEEE document is made available for use subject to important notices and legal disclaimers. These notices and disclaimers appear in all publi
37、cations containing this document and may be found under the heading “Important Notice” or “Important Notices and Disclaimers Concerning IEEE Documents.” They can also be obtained on request from IEEE or viewed at http:/standards.ieee.org/IPR/disclaimers.html. 1. Overview Objective or subjective meth
38、ods can be used to measure telephone transmission performance. This standard discusses objective procedures utilizing mouth simulators, ear simulators, laboratory microphones, and test instruments to characterize transmission performance. Subjective procedures are particularly applicable for rating
39、overall communication connections involving the real voice and real ear of human subjects. Telephones, handsets, and headsets can be evaluated by purely objective methods provided the results generally agree with the desirable performance characteristics of subjective testing. The relationships that
40、 are established between subjective and objective measurements will vary with the physical constants of the telephone design, such as the size and shape of the handset or headset, the sound leakage between the receiver and the ear of the user, and the signal processing in the speech path. Therefore,
41、 the correlation between subjective and objective measurements should be established separately for each telephone, headset or handset design before measurements obtained using the techniques covered herein can be interpreted to reflect performance under conditions of actual use. Execution of this s
42、tandard provides a means of determining the operational characteristics of a telephone over the range of conditions encountered during normal operation. IEEE Std 269-2010 IEEE Standard for Methods Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets 2 Copyright 2010
43、IEEE. All rights reserved. 1.1 Scope This standard provides the techniques for objective measurement of electroacoustic characteristics of analog and digital telephones, handsets and headsets. Application is in the frequency range from 100 Hz to 8500 Hz. Although not specifically within the scope of
44、 this standard, the methods described are generally applicable to a wide variety of other communications equipment, including cordless, wireless and mobile communications devices. Digital devices that have audio characteristics of a digital telephone can be tested as a digital telephone, even if the
45、y do not have a dialpad or other similar telephone functions. USB headsets are one example of devices in this class. Telephones with speakerphone features are covered by IEEE Std 1329.1Due to the various characteristics of these devices and the environments in which they operate, not all of the test
46、 procedures in this standard are applicable to all types of telephones, handsets or headsets. Application of the test procedures to atypical telephones should be determined on an individual basis. 1.2 Purpose The purpose of this standard is to provide practical methods for making laboratory measurem
47、ents of the transmission characteristics of analog and digital telephones, handsets, and headsets so that their performance may be evaluated on a standardized basis. 1.3 Contents of standard This is a brief summary of the clauses contained in the standard. The primary measurement procedures appear i
48、n Clause 6 through Clause 8 of the document. Clause 2 Clause 3 provides references, definitions, abbreviations, acronyms, and symbols which will be useful in executing the tests of this standard. These clauses provide a background in the terminology used for telephone, handset, and headset testing.
49、Clause 4 specifies the test equipment, test environment and acoustic impairments. The test equipment portion includes ear and mouth simulators, test fixtures, and measurement microphones, as well as procedures for positioning the telephone handset or headset for testing. The test environment includes both the acoustical and physical characteristics of the test space. Acoustic impairments include specific acoustic conditions which could degrade the performance of the device under test. Clause 5 describes the calibration procedures needed to ensure that the equipment is
