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14、ghts, and the risk of infringement of such rights, is entirely their own responsibility. Further information may be obtained from the IEEE Standards Association.Participants At the time this standard was completed, the Telephone Instrument Testing Working Group had the following membership: John Bar
15、eham, Chair Glenn Hess, Vice Chair Al Baum Clifford Chamney Miguel De Araujo Daniel Foley Steve Graham Roger Gutzwiller Scott Isabelle Frederick Kruger Ron D. Magnuson Scott Pennock Anthony Scott Hong Sodoma Christopher J. Struck Stephen R. Whitesell Allen Woo Robert Young The following members of t
16、he individual balloting committee voted on this standard. Balloters may have voted for approval, disapproval, or abstention. John Bareham Al Baum H Stephen Berger William Bush Mark Bushnell William Byrd Keith Chow Thomas Dineen Sourav Dutta Daniel Foley Andre Fournier Alexander Gelman Randall C. Gro
17、ves Michael Gundlach Glenn Hess Werner Hoelzl Sergiu Iordanescu Scott Isabelle Efthymios Karabetsos Piotr Karocki Stuart Kerry Frederick Kruger Greg Luri Wayne Manges Matthias Meier Michael S. Newman Robert Robinson Bartien Sayogo Gil Shultz Christopher J. Struck Walter Struppler Michael Townsend Jo
18、hn Vergis Stephen R. Whitesell Oren Yuen iv Copyright 2012 IEEE. All rights reserved. When the IEEE-SA Standards Board approved this standard on 29 March 2012, it had the following membership: Richard H. Hulett, Chair John Kulick, Vice Chair Robert M. Grow, Past Chair Judith Gorman, Secretary Satish
19、 Aggarwal Masayuki Ariyoshi Peter Balma William Bartley Ted Burse Clint Chaplin Wael Diab Jean-Philippe Faure Alexander Gelman Paul Houz Jim Hughes Young Kyun Kim Joseph L. Koepfinger* David J. Law Thomas Lee Hung Ling Oleg Logvinov Ted Olsen Gary Robinson Jon Walter Rosdahl Mike Seavey Yatin Trived
20、i Phil Winston Yu Yuan *Member Emeritus Also included are the following nonvoting IEEE-SA Standards Board liaisons: Richard DeBlasio, DOE Representative Michael Janezic, NIST Representative Michelle Turner IEEE Standards Program Manager, Document Development Lisa Perry IEEE Standards Program Manager
21、, Technical Program Development vii Copyright 2012. IEEE. All rights reserved. Introduction This introduction is not part of IEEE Std 269a-2012, IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and HeadsetsAmendment 1. This amendment has be
22、en 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. This document amends IEEE Std 269-2010. The changes are intended to update measurement methods
23、 to reflect evolving measurement technology. There are also a few error corrections. viii Copyright 2012 IEEE. All rights reserved. ix Copyright 2012 IEEE. All rights reserved. Contents 2. Normative references 2 3. Definitions 2 4. Test equipment and setup . 2 4.1 Ear simulators 2 6. Test procedure
24、for analog sets 4 6.5 Send . 4 6.8 Telephone set impedance. 4 7. Test procedures for digital and 4-wire systems 4 7.2 Digital test circuits. 4 7.5 Send . 5 8. Test procedures for analog 4-wire handsets and headsets 5 8.4 Send . 5 Annex E (normative) Test signals 6 Annex G (normative) Analysis method
25、s . 7 Annex J (normative) Receive level, conversational gain, and frequency response metrics . 8 Annex L (normative) Distortion. 11 Annex M (normative) Send signal-to-noise ratio ambient noise reduction and its effects on speech quality 13 1 Copyright 2012 IEEE. All rights reserved. IEEE Standard Me
26、thods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets Amendment 1 IMPORTANT NOTICE: IEEE Standards documents are not intended to ensure safety, health, or environmental protection, or ensure against interference with or from other devices or networ
27、ks. Implementers of IEEE Standards documents are responsible for determining and complying with all appropriate safety, security, environmental, health, and interference protection practices and all applicable laws and regulations. This IEEE document is made available for use subject to important no
28、tices 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 Documents.” They can also be obtained on request from IEEE or viewed at http:/sta
29、ndards.ieee.org/IPR/disclaimers.html. NOTEThe editing instructions contained in this amendment define how to merge the material contained therein into the existing base standard and its amendments to form the comprehensive standard.1The editing instructions are shown in bold italic. Four editing ins
30、tructions are used: change, delete, insert, and replace. Change is used to make corrections in existing text or tables. The editing instruction specifies the location of the change and describes what is being changed by using strikethrough (to remove old material) and underscore (to add new material
31、). Delete removes existing material. Insert adds new material without disturbing the existing material. Insertions may require renumbering. If so, renumbering instructions are given in the editing instruction. Replace is used to make changes in figures or equations by removing the existing figure or
32、 equation and replacing it with a new one. Editing instructions, change markings, and this NOTE will not be carried over into future editions because the changes will be incorporated into the base standard. 1Notes in text, tables, and figures of a standard are given for information only and do not c
33、ontain requirements needed to implement this standard. IEEE Std 269a-2012 IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and HeadsetsAmendment 1 2. Normative references Insert the following references in alphanumeric order: ETSI EG 202 39
34、6-1, Speech and multimedia Transmission Quality (STQ); Speech quality performance in the presence of background noisePart 1: Background noise simulation technique and background noise database. ETSI EG 202 396-3, Speech and multimedia Transmission Quality (STQ); Speech Quality performance in the pre
35、sence of background noisePart 3: Background noise transmissionObjective test methods. ETSI TS 126 132, Universal Mobile Telecommunications System (UMTS); LTE; Speech and video telephony terminal acoustic test specification (3GPP TS 26.132). ITU-T Recommendation P.835, Subjective test methodology for
36、 evaluating speech communication systems that include noise suppression algorithm. ITU-T Recommendation P.863, Perceptual objective listening quality assessment Change the following reference: ITU-T Recommendation P.50, Appendix 1, (1998): Test Signals. 3. Definitions Change the definition of dBm0 a
37、s follows: dBm0: Power level in dBm, relative to a reference point called the zero transmission level point, or 0 TLP. A signal level of X dBm at the 0 TLP is designated X dBm0. In a codec, the 0 TLP is specified in relationship to the full-scale digital level or saturation. However, digital saturat
38、ion is generally not 0 dBm0. For -law codecs 0 dBm0 is 3.17 dB below digital full scale. For A-law codecs 0 dBm0 is 3.14 dB below digital full scale. For the L16-256 wideband codec, 0 dBm0 is 3.17 dB below digital full scale. 4. Test equipment and setup 4.1 Ear simulators 4.1.3 Translation from DRP
39、to ERP Change 4.1.3 as follows: Type 3.3 ear simulator measures at the eardrum reference point (DRP). Unless otherwise specified or permitted in this standard, fFor loudness rating calculations, measurements collected at the DRP shall be translated to the ERP. This is done because receive and sideto
40、ne loudness rating specifications are referenced to the ERP. It also permits comparison of measurements made on the various type ear simulators. 2 Copyright 2012 IEEE. All rights reserved. IEEE Std 269a-2012 IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone
41、 Sets, Handsets, and HeadsetsAmendment 1 For all measurements, data collected at the DRP may be translated to the ERP. the translation from DRP to ERP may be fulfilled by using a filter as specified in Annex C. A filter shall be used for measurements of peak acoustic pressure, and is recommended for
42、 measurements of distortion. For measurements made with any kind of spectrum analysis, the translation from DRP to ERP may be performed by using one of the tables in Annex C. Measurement examples include frequency response, noise, linearity and distortion. Tables may also be used for frequency respo
43、nse measurements made with sine waves, if only the fundamental or total response is included. For measurements of distortion using a sine or narrowband stimulus, a translation table may be constructed based on one of the tables in Annex C. Separate tables are required for each harmonic or difference
44、-frequency distortion product, taking into account the frequency offset between the stimulus frequency and the frequency of the distortion product. The choice of translation is generally determined by either the performance specification or the nature of the application. 4.1.4 Translation from DRP t
45、o free field Change 4.1.4 as follows: Measurements collected at the DRP may be translated to the free field, except for calculating loudness ratings. Some clauses in this standard require translation to the free field. The free field translation may be done along with the translation to ERP and/or d
46、iffuse field. In this case, the free field is defined as sound coming from 0 degrees azimuth and 0 degrees elevation. Please see IEEE Std 1652 for the method, translation curves, and background information. The choice of translation is generally determined by either the performance specification or
47、the nature of the application. Insert two new subclauses (4.1.5 and 4.1.6) after 4.1.4: 4.1.5 Translation from DRP to diffuse field Measurements collected at the DRP may be translated to the diffuse field, except for calculating loudness ratings. The diffuse field translation may be done along with
48、the translation to ERP and/or free field. Please see IEEE Std 1652 for the method, translation curves, and background information. The choice of translation is generally determined by either the performance specification or the nature of the application. 4.1.6 Implementation For all measurements, th
49、e translation from DRP to ERP, or from DRP to a sound field such as DF or FF, may be fulfilled by using a filter as specified in Annex C. A filter shall be used for measurements of peak acoustic pressure, and is recommended for measurements of distortion. For measurements made with any kind of spectrum analysis, the translation from DRP to ERP may be performed by using one of the tables in Annex C. Translations from DRP to DF or FF may be performed by 3 Copyright 2012 IEEE. All rights reserved. IEEE Std 269a-2012 IEEE Standard Methods for Measuring Transmission
