1、 TIA-920.120-A November 2012Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones with Speakerphone NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between m
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6、.120-A, 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 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U
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22、 THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-920.120-A ii Table of Contents 1. SCOPE 4 1.1. LIMITS OF APPLICABILITY 4 1.2. LIMITS OF THIS STANDARD FOR PRODUCT EVALUATION 4 1.3. CATEGORIES OF CRITERIA . 5 1.4. ENVIRONMENTAL . 5 1.5. SAFETY . 5 2
23、. NORMATIVE REFERENCES 6 3. DEFINITIONS, ABBREVIATIONS AND ACRONYMS . 7 3.1. DEFINITIONS . 7 3.2. ABBREVIATIONS AND ACRONYMS . 9 4. GENERAL TECHNICAL REQUIREMENTS 10 4.1. TEST ENVIRONMENT BACKGROUND NOISE 10 4.2. REFERENCE CODECS 10 4.2.1. L16-256 Reference Codec. 11 4.2.2. Other Reference Codecs 11
24、 4.3. TEST SIGNALS 11 4.3.1. Test Stimulus Signal . 11 4.3.2. Analysis . 12 4.4. PRECAUTIONS . 12 4.5. TEST ARRANGEMENTS . 12 4.5.1. Reference Codec Arrangement . 12 4.5.2. Direct Digital Signal Processing Arrangement . 13 4.5.3. Send General Test Arrangement . 13 4.5.4. Receive General Test Arrange
25、ment 14 4.5.5. Terminal Coupling Loss General Test Arrangement 14 4.5.6. Send Level Directionality Test Arrangement 15 5. SPEAKERPHONE TECHNICAL REQUIREMENTS . 16 5.1. SEND. 16 5.1.1. Speakerphone Send Electrical Output . 16 5.1.2. Speakerphone Send Frequency Response . 17 5.1.3. Send Directionality
26、 . 19 5.1.4. Speakerphone Send Noise . 19 5.1.5. Speakerphone Send Single Frequency Interference 20 5.1.6. Speakerphone Send Distortion and Noise . 20 5.1.7. Speakerphone Send Delay. 22 5.2. RECEIVE . 23 5.2.1. Speakerphone Receive Acoustic Output . 23 5.2.2. Speakerphone Receive Volume Control . 24
27、 5.2.3. Speakerphone Receive Frequency Response 24 5.2.4. Speakerphone Receive Noise 26 5.2.5. Speakerphone Receive Single Frequency Interference . 26 5.2.6. Speakerphone Receive Distortion and Noise 27 5.2.7. Speakerphone Receive Delay 28 5.3. TALKER SIDETONE CONSIDERATIONS . 29 TIA-920.120-A iii 5
28、.4. WEIGHTED TERMINAL COUPLING LOSS (TCLW) 30 5.4.1. Requirements 30 5.4.2. Measurement Method . 31 ANNEX A (NORMATIVE) SPEAKERPHONE RECEIVE LOUDNESS RATING (RLR)32 ANNEX B (NORMATIVE) SPEAKERPHONE SEND LOUDNESS RATING (SLR) . 33 ANNEX C (NORMATIVE) CALCULATION OF LOUDNESS RATINGS . 34 C.1 WIDEBAND
29、SEND LOUDNESS RATING (HANDSET, SPEAKERPHONE AND HEADSET) 34 C.2 WIDEBAND RECEIVE LOUDNESS RATING (SPEAKERPHONE ONLY) . 34 ANNEX D (INFORMATIVE) MEASUREMENT AND LEVEL CONVERSIONS 36 ANNEX E (INFORMATIVE) R40 PREFERRED FREQUENCIES . 37 ANNEX F (INFORMATIVE) TERMS RELATED TO DIGITAL TRANSMISSION LEVELS
30、 40 ANNEX G (INFORMATIVE) - RECOMMENDATIONS FOR SUBJECTIVE QUALITY EVALUATION . 42 G.1 SEND LOUDNESS . 43 G.2 SEND NOISE 43 G.3 SEND DISTORTION 44 G.4 ACOUSTIC ECHO CANCELLATION PERFORMANCE DURING SINGLE-TALK 44 G.5 ACOUSTIC ECHO CANCELLATION PERFORMANCE DURING DOUBLE-TALK 45 ANNEX H (INFORMATIVE) B
31、NR STUDY 46 H.1 OBJECTIVES 46 H.2 APPARATUS 46 H.3 PROCEDURE 46 H.4 PRELIMINARY RESULTS . 46 H.5 RECOMMENDATIONS 47 H.6 TABLE OF RESULTS 47 ANNEX I (INFORMATIVE) BIBLIOGRAPHY . 49 TIA-920.120-A iv Table of Figures Figure 1 Digital Telephone Set Test Arrangement with Reference Codec . 12 Figure 2 Dig
32、ital Telephone Set Test Arrangement using Direct Digital Signaling . 13 Figure 3 Speakerphone Send Test Setup . 13 Figure 4 Speakerphone Receive Test Setup 14 Figure 5 Terminal Coupling Loss Test Setup 14 Figure 6 Speakerphone Send Level Directionality Measurement Setup . 15 Figure 7 Speakerphone Se
33、nd Frequency Response Mask . 18 Figure 8 Speakerphone Receive Frequency Response Mask 25 Table of Tables Table 1 Co-ordinates of Speakerphone Send Response Limits . 18 Table 2 Send Directionality Limits . 19 Table 3 Limits for Send SDNR vs. Frequency 20 Table 4 Limits for Send SDNR vs. Level 20 Tabl
34、e 5 Send SDNR Stimulus Center Frequencies and Band Limits 21 Table 6 Send SDNR Analysis Notch Frequency Band . 21 Table 7 Speakerphone Send Delay Requirements . 22 Table 8 Co-ordinates of Speakerphone Receive Response Limits 25 Table 9 Limits for Receive SDNR vs. Frequency . 27 Table 10 Limits for R
35、eceive SDNR vs. Level . 27 Table 11 Receive SDNR Stimulus Center Frequencies and Band Limits . 28 Table 12 Receive SDNR Analysis Notch Frequency Band 28 Table 13 Speakerphone Receive Delay Requirements 29 Table C.1 Weighting Factors for Calculating Wideband Loudness Ratings and STMR 35 Table E.1 ISO
36、 R40 and R10 Preferred Frequencies, 1/12th and 1/3rd Octave Frequencies . 38 Table H.1 Room Noise 35 dBA User Acceptance Levels . 47 Table H.2 Room Noise 45 dBA User Acceptance Levels . 48 Table H.3 Room Noise 55 dBA User Acceptance Levels . 48 TIA-920.120-A 1 FOREWORD (This foreword is not part of
37、this standard.) This document is a TIA Telecommunications standard produced by Working Group TR-41.3.3 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-41.3, which s
38、erved as the formulating group. This standard is based on TIA-920. There are eight annexes in this Standard. Annex A, Annex B and Annex C are normative and are considered part of this Standard. Annex D, Annex E, Annex F, Annex G, Annex H and Annex I are informative and are not considered part of thi
39、s Standard. The leadership of the TR-41.3.3 VoIP and PCM Digital Transmission Performance Working Group (Chair: Allen Woo, Plantronics) acknowledges the written contributions provided by the following individuals in the development of this standard. Organization Representative Previous Version TIA-9
40、20.120-A Harman International Glenn Hess Editor AST Technology Labs Don McKinnon Editor Plantronics Steve Graham Editor Nortel Networks Roger Britt Editor Siemens Ron Magnuson Editor Alcatel Francois Pinier AST Technology Labs James Bress Cisco Systems Ram Jagadeesan Cisco Systems Michael Knappe Cis
41、co Systems Kirit Patel IEEE STIT John Bareham IEEE STIT Rodolfo Ceruti IEEE STIT Bob Young Intel Corporation Mike Dunn Microsoft Robert Aichner Microsoft Hong Sodoma PictureTel Corporation Dave Lindbergh Plantronics Bill Rains Plantronics Allen Woo Polycom Peter Baker Texas Instruments Warren Karape
42、tian Uniden Al Baum Whitesell Consulting Steve Whitesell TIA-920.120-A 2 Copyrighted parts of ITU-T Appendix I to Recommendation G.113 and Recommendation P.79 are used with permission of the ITU. The ITU owns the copyright for the ITU Recommendations. Copyrighted parts of ISO 3 are used with permiss
43、ion of the ISO. The ISO owns the copyright for the ISO Standards. Suggestions for improvement of this standard are welcome. They should be sent to: Telecommunications Industry Association Engineering Department Suite 300 250 Wilson Boulevard Arlington, VA 22201 ( http:/www.tiaonline.org ) TIA-920.12
44、0-A 3 Introduction This revision of TIA-920 establishes speakerphone audio performance requirements for wideband digital wireline telephones regardless of protocol or digital format. Significant improvements and corrections have been made. For devices that also have a handset or headset or both, sta
45、ndards TIA-920.110-A and TIA-920.130-A, respectively, apply. A significant change to this standard is the addition of output level measurements for send and receive. Send and receive parameters may be measured using either the output level method or the loudness rating method. It is the intent to re
46、move loudness ratings from future versions of this standard. Wideband is nominally defined as the frequency range between 150 and 6800 Hz. Performance requirements for conventional narrowband telephony in the frequency range between 300 and 3400 Hz are established in ANSI/TIA-810-B. TIA-920.120-A 4
47、Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones with Speakerphone 1. Scope This standard establishes transmission performance requirements for speakerphone devices that function as wideband digital wireline telephones. Group speakerphones that are comm
48、only used in large conference rooms and with larger groups of people are outside the scope of this document. Transmission may be over any digital interface including Local or Wide Area Networks, Firewire/IEEE Std 1394, Universal Serial Bus (USB), public ISDN or digital over twisted pair wire. This i
49、ncludes TDM-based and packet-based (e.g. VoIP) transmission protocols. These telephones may be connected through modems, voice gateways, wireless access points, or PBXs, or they may be personal-computer-based telephones. Examples include, but are not limited to: ISDN telephones, digital proprietary telephones, VoIP telephones (corded and cordless), softphones running on personal computers, IEEE Std 802.11 telephones, USB tele
