ANSI TIA-470.122-2013 Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Analog Telephones with Speakerphones.pdf

1、 TIA-470.122 December 2013Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Analog Telephones with Speakerphones ANSI/TIA-470.122- 2013 APPROVED: NOVEMBER 26, 2013 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through

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6、re its use. (From Standards Proposal No. ANSI/TIA-PN-470.122-D1, formulated under the cognizance of the TIA TR-41 User Premises Telecommunications Requirements, TR-41.3 Subcommittee on Analog and Digital Wireline Terminals. . Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Technology (b) there

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19、F DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-470.122 i TABLE OF CONTENTS FOREWORD . v INTRODUCTION vi 1 SCOPE 1 2 NORMATIVE REFERENCES 2 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS 3 3.1 ABBRE

20、VIATIONS AND ACRONYMS 3 3.2 DEFINITIONS 4 4 TESTING CONSIDERATIONS 5 4.1 GENERAL . 5 4.1.1 Acoustic Test Environment and Equipment 5 4.1.2 Test Signals 5 4.1.3 Test Measurement Resolution. 5 4.1.4 Test Positions . 5 4.1.5 Test Methods . 8 4.1.6 Test Points and Range of Requirements 8 4.1.7 Subjectiv

21、e Tests . 8 4.2 TEST CIRCUITS 9 4.2.1 Send Testing Circuit . 9 4.2.2 Receive Testing Circuit 9 4.2.3 DC Feed Circuit . 9 4.2.4 Termination Impedance 10 4.2.5 Source Impedance 10 5 TECHNICAL REQUIREMENTS . 11 5.1 CATEGORIES OF CRITERIA . 11 5.2 SEND PERFORMANCE . 12 5.2.1 Send Frequency Response 12 5

22、.2.2 Send Output Magnitude . 14 5.2.3 Send Directionality . 15 5.2.4 Send Distortion 16 5.2.5 Send Noise On-Hook 17 5.2.6 Send Noise Off-Hook 18 5.2.7 Send Noise Off-Hook Single Frequency Interference . 18 5.2.8 Send Muting . 19 5.3 RECEIVE PERFORMANCE 20 5.3.1 Determination of Nominal Volume Contro

23、l Setting . 20 5.3.2 Receive Frequency Response 20 5.3.3 Receive Output Magnitude . 22 ANSI/TIA-470.122 ii 5.3.4 Receive Volume Control Conversational Gain . 23 5.3.5 Receive Volume Control Range 23 5.3.6 Receive Directionality. 24 5.3.7 Receive Distortion 24 5.3.8 Receive Distortion at Maximum Volu

24、me Control Setting 26 5.3.9 Receive Noise Off-Hook . 26 5.3.10 Receive Noise Off-Hook Single Frequency Interference . 27 ANNEX A (NORMATIVE) A-WEIGHTING NOISE CURVE 28 ANNEX B (NORMATIVE) CALCULATION OF LOUDNESS RATINGS 29 B.1 SEND LOUDNESS RATING: 29 B.2 RECEIVE LOUDNESS RATING: 30 B.3 SIDETONE MAS

25、KING RATING (HANDSET): . 30 ANNEX C (NORMATIVE) ISO R10 FREQUENCIES 32 ANNEX D (INFORMATIVE) DETERMINATION OF NOMINAL LOUDNESS RATING VALUES 33 D.1 ANALYSIS OF EFFECTS OF TEST CONFIGURATION DIFFERENCES. 33 D.2 APPLICATION TO LOUDNESS RATING VALUES . 36 ANNEX E (INFORMATIVE) LOSS PLAN AND LOUDNESS RA

26、TING REFERENCES AND HIERARCHY 38 ANNEX F (INFORMATIVE) BIBLIOGRAPHY . 39 ANNEX G (INFORMATIVE) ITEMS FOR FUTURE CONSIDERATION . 40 G.1 VOICE SWITCHING PERFORMANCE . 40 G.2 ACOUSTIC ECHO CANCELLER PERFORMANCE . 40 G.3 DYNAMIC SEND BACKGROUND NOISE SUPPRESSION 41 G.4 SWITCHING OPERATION BETWEEN SPEAKE

27、RPHONE & HANDSET MODE 41 ANSI/TIA-470.122 iii TABLE OF FIGURES Figure 1 Test position setup for send measurements . 5 Figure 2 Speakerphone send directionality measurement setup . 6 Figure 3 Test position setup for receive measurements . 7 Figure 4 Speakerphone receive directionality measurement set

28、up . 8 Figure 5 Test circuit for send measurements 9 Figure 6 Test circuit for receive measurements 9 Figure 7 One possible dc feed circuit . 10 Figure 8 Send frequency response limits 14 Figure 9 Receive frequency response limits 22 Figure A.1 A-weighting noise weighting curve . 28 Figure D.1 Send

29、test configurations . 34 Figure D.2 Receive test configurations 34 Figure D.3 Test configuration loop loss effects 36 Figure D.4 SLR calculation example . 37 Figure D.5 RLR calculation example. 37 Figure E.1 Hierarchical relationship between loudness rating and loss plan standards . 38 ANSI/TIA-470.

30、122 iv TABLE OF TABLES Table 1 Send frequency response limits . 13 Table 2 Send directionality limits. . 15 Table 3 Limits for send SDNR vs frequency 16 Table 4 Limits for send SDNR vs level 16 Table 5 Send SDNR stimulus center frequencies and band limits . 17 Table 6 Send SDNR analysis notch freque

31、ncy band . 17 Table 7 Receive frequency response limits . 21 Table 8 Receive directionality limits. . 24 Table 9 Limits for receive SDNR vs frequency 25 Table 10 Limits for receive SDNR vs level 25 Table 11 Receive SDNR stimulus center frequencies and band limits . 26 Table 12 Receive SDNR analysis

32、notch frequency band 26 Table A.1 A-weighting curve 28 Table B-1 ITU-T P.79 Tables A.2 and 3, Weighting factors for calculating loudness ratings 31 Table C-1 1/3rd octave and ISO R10 frequencies . 32 Table D.1 Test configuration loop loss effects . 35 ANSI/TIA-470.122 v Foreword (This foreword is no

33、t part of this Standard.) This document is a TIA Telecommunications standard produced by Working Group TR-41.3.5 of Committee TR-41. This standard was developed in accordance with TIA procedural guidelines, and represents the consensus position of the Working Group and its parent Subcommittee TR-41.

34、3, which served as the formulating group. There are seven annexes in this Standard. Annexes A, B, and C are normative and are considered part of this Standard. Annexes D, E, F, and G are informative and are not considered part of this Standard. Copyrighted parts of ITU-T Recommendation P.79 are used

35、 with permission of the ITU. The ITU owns the copyright for the ITU Recommendations. Copyrighted parts of ISO 3 are used with permission of the ISO. The ISO owns the copyright for the ISO Standards. The leadership of the TR-41.3.5 Analog Telephone Transmission Performance Working Group (Chair: Steph

36、en R Whitesell, Whitesell Consulting LLC) acknowledges the written contributions provided by the following individuals in the development of this standard. Organization Representative TIA-470.122 Consultant to Microsemi Corp Stephen R Whitesell Editor AST Technology Labs James Bress AST Technology L

37、abs Don McKinnon Cisco Systems Tim Lawler Industry Canada Jason Nixon Industry Canada Magdoly Rondn Microsemi Corporation Gilbert Amine Microsemi Corporation Dave Chabinec Suggestions for improvement of this standard are welcome. They should be sent to: Telecommunications Industry Association Engine

38、ering Department Suite 200 1320 North Courthouse Road Arlington, VA 22201 ( http:/www.tiaonline.org ) ANSI/TIA-470.122 vi Introduction Analog telephones have traditionally been designed for transmitting and receiving audio in the 300 to 3400 Hz frequency range for legacy PSTN reasons. These telephon

39、es are increasingly being used with wideband-capable residential gateways that can deliver VoIP-based telephony in the 50 to 7000 Hz frequency range. Wideband telephony offers greater audio clarity and could enable new services such as streaming audio or enhanced speech recognition. The lack of stan

40、dards for wideband analog telephony has given rise to a chicken and egg situation whereby gateway manufacturers are waiting for wideband telephones to become available in order to offer this feature and terminal manufacturers are not developing wideband telephones for the lack of wideband voice gate

41、ways with which they can operate. This document is one of a group of standards intend to help resolve the issue. This Standard provides wideband transmission requirements for telephones equipped with speakerphones. Companion documents in the ANSI/TIA-470.1X2 series provide corresponding transmission

42、 requirements for telephones equipped with handsets and headsets. ANSI/TIA-470.122 1 Telephone Terminal Equipment Transmission Requirements for Wideband Analog Telephones with Speakerphones 1 SCOPE This standard provides acoustic transmission performance requirements for speakerphone equipped analog

43、 telephones intended for connection to terminal adapters and voice gateways that provide wideband speech using packet-based services such as Voice over Internet Protocol (VoIP). These services are often referred to as high definition or HD voice services. The specification range for this standard is

44、 100 to 8000 Hz, but for practical reasons the actual audio bandwidth of covered devices is typically about 150 to 6800 Hz. This standard is limited to single housing speakerphones intended for use on a desk or table by a single user at a distance of one half meter or closer. The terminal adapters a

45、nd voice gateways used to provide HD voice services normally present 600 ohm impedances and are connected to the wideband telephone with very short lengths of cabling. If the wideband telephone is likely to be used in applications where it may also be connected to narrowband voice services, such as

46、the public switched telephone network (PSTN), that provide 900 ohm impedances and may use significant lengths of loop (cabling), then evaluation for compliance with the latest version of the ANSI/TIA-470.120 standard for narrowband analog telephones with speakerphones is suggested. ANSI/TIA-470.122

47、2 2 NORMATIVE REFERENCES The following standards contain provisions, which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard a

48、re encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. 1. ANSI S1.4-1983 (R2006) American National Standard Specification for Sound Level Meters 2. AN

49、SI/ASA S1.15-1997 Part 1 (R2011) American National Standard Measurement Microphones, Part 1: Specifications for Laboratory Standard Microphones 3. IEEE Std 269-2010 IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets 4. IEEE Std 1329-2010 IEEE Standard Method for Measuring Transmission Performance of Speakerphones 5. ISO 3: 1973, Preferred Numbers - Series of Preferred Numbers 6. ITU-T Recommendatio