1、 TIA-920.120-B February 2017Telecommunications Communications Products Transmission Requirements for Digital Interface Communications Devices with Speakerphones ANSI/TIA-920.120-B-2017 APPROVED: FEBRUARY 2, 2017 NOTICE TIA Engineering Standards and Publications are designed to serve the public inter
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23、TAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-920.120-B i TABLE OF CONTENTS FOREWORD. IV INTRODUCTION V 1 SCOPE 1 1.1 LIMITS OF APPLICABILITY . 1 1.2 LIMITS OF THIS STANDARD FOR PRODUCT EVALUATION 1 1.3 CATEGORIES O
24、F CRITERIA . 2 1.4 ENVIRONMENTAL . 2 1.5 SAFETY . 2 2 NORMATIVE REFERENCES 3 3 DEFINITIONS, ABBREVIATIONS AND ACRONYMS 4 3.1 DEFINITIONS . 4 3.2 ABBREVIATIONS AND ACRONYMS . 6 4 TESTING CONSIDERATIONS 7 4.1 GENERAL 7 4.1.1 Test Environment Background Noise 7 4.1.2 Acoustic Test Interface Equipment .
25、7 4.1.3 Test Signals .7 4.1.4 Test Position 8 4.1.5 Test Methods .8 4.1.6 Test Points and Range of Requirements 8 4.1.7 Subjective Tests .8 4.2 PRECAUTIONS. 8 4.3 REFERENCE CODECS 8 4.3.1 IETF RFC 3551 L16-256 Wideband Reference Codec 9 4.3.2 ITU-T Recommendation G.711 Narrowband Reference Codec .9
26、4.3.3 Other Reference Codecs 10 4.4 TEST ARRANGEMENTS . 10 4.4.1 Reference Codec Arrangement .11 4.4.2 Direct Digital Signal Generation and Analysis Arrangement .11 4.4.3 Receive General Test Setup Arrangements .12 4.4.4 Send General Test Setup Arrangements 13 4.4.5 Send Level Directionality Test Ar
27、rangement 14 4.4.6 Terminal Coupling Loss Test Setup Arrangements 15 5 TECHNICAL REQUIREMENTS 16 5.1 CATEGORIES OF CRITERIA . 16 5.2 COMPLIANCE WITH THE STANDARD 16 5.3 RECEIVE PERFORMANCE 17 5.3.1 Receive Output Level 17 5.3.2 Receive Volume Control .18 5.3.3 Receive Frequency Response 19 5.3.4 Rec
28、eive Noise Idle Channel .22 5.3.5 Receive Single Frequency Interference (SFI) Idle Channel .22 ANSI/TIA-920.120-B ii 5.3.6 Receive Noise Active Channel .23 5.3.7 Receive Distortion and Noise 23 5.3.8 Receive Distortion and Noise Maximum Volume Control Setting 24 5.3.9 Receive Delay 24 5.4 SEND PERFO
29、RMANCE . 25 5.4.1 Send Output .25 5.4.2 Send Frequency Response .25 5.4.3 Send Level Directionality (SLD) for Desktop Speakerphones .28 5.4.4 Send Noise Without Stimulus 29 5.4.5 Send Single Frequency Interference (SFI) Idle Channel 29 5.4.6 Send Noise With Stimulus .29 5.4.7 Send Distortion and Noi
30、se .30 5.4.8 Send Delay 30 5.5 WEIGHTED TERMINAL COUPLING LOSS (TCLW) 31 5.5.1 Requirement 31 5.5.2 Measurement Method 32 5.6 SUBJECTIVE SPEECH QUALITY AND OBJECTIVE SPEECH QUALITY . 33 5.6.1 Subjective Speech Quality .33 5.6.2 Objective Speech Quality 33 ANNEX A (NORMATIVE) PULSED NOISE SIGNAL-TO-D
31、ISTORTION-AND-NOISE RATIO (PN-SDNR) . 34 ANNEX B (INFORMATIVE) OBJECTIVE SOUND QUALITY. 37 ANNEX C (INFORMATIVE) RECEIVE ASSISTIVE FEATURES 38 C.1 SPEAKERPHONE RECEIVE TONE CONTROL 38 C.2 SPEAKERPHONE RECEIVE AUTOMATIC GAIN CONTROL (AGC) 38 C.3 SPEAKERPHONE RECEIVE AUTOMATIC LEVEL ENHANCEMENT (ALE)
32、. 38 ANNEX D (INFORMATIVE) MEASUREMENT AND LEVEL CONVERSIONS 39 ANNEX E (INFORMATIVE) ISO FREQUENCIES . 40 ANNEX F (INFORMATIVE) CODEC REFERENCE POINT DEFINITIONS . 42 ANNEX G (INFORMATIVE) BIBLIOGRAPHY . 43 ANSI/TIA-920.120-B iii TABLE OF FIGURES Figure 1 Digital Communications Device Test Arrangem
33、ent with Reference Codec 11 Figure 2 Digital Communications Device Test Arrangement using Direct Digital 11 Figure 3 Receive Test Setup Arrangement Desktop Device 12 Figure 4 Receive Test Setup Arrangement Handheld Cordless Device . 12 Figure 5 Send Test Setup Arrangement Desktop Device. 13 Figure 6
34、 Send Test Setup Arrangement Handheld Cordless Device . 13 Figure 7 Send Level Directionality Test Setup Desktop Device 14 Figure 8 Terminal Coupling Loss Test Setup Arrangement Desktop Device 15 Figure 9 Terminal Coupling Loss Test Setup Arrangement Handheld Cordless Device 15 Figure 10 Wideband Re
35、ceive Frequency Response Limits 20 Figure 11 Narrowband Receive Frequency Response Limits . 21 Figure 12 Wideband Send Frequency Response Limits . 26 Figure 13 Narrowband Send Frequency Response Limits 27 Figure A.1 Stimulus, Measurement, and Analysis Bands for PN-SDNR 34 TABLE OF TABLES Table 1 L16
36、-256 Periodic Sequence for Producing a 1 kHz, 0 dBm0 Sine Wave 9 Table 2 G.711 Periodic Sequence for Producing a 1 kHz, 0 dBm0 Sine Wave . 10 Table 3 Wideband Receive Frequency Response Limits 20 Table 4 Narrowband Receive Frequency Response Limits 21 Table 5 Wideband Send Frequency Response Limits.
37、 26 Table 6 Narrowband Send Frequency Response Limits . 27 Table 7 Send Level Directionality Limits . 28 Table A.1 Stimulus and Stimulus Measurement Bands for PN-SDNR 35 Table A.2 Distortion Analysis Notch Bands for PN-SDNR . 36 Table E.1 ISO R-40, ISO R-10, 1/12th Octave and 1/3rd Octave Frequencie
38、s 40 Table F.1 0 dBm0 Reference Point for Various Codecs . 42 ANSI/TIA-920.120-B iv FOREWORD (This foreword is not part of 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 pro
39、cedural guidelines, and represents the consensus position of the Working Group and its parent Subcommittee TR-41.3, which served as the formulating group. There are seven annexes in this Standard. Annex A is normative and is considered part of this Standard. Annexes B G are informative and are not c
40、onsidered part of this Standard. The leadership of the TR-41.3.3 VoIP and PCM 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
41、Versions TIA-920.120-B AST Technology Labs Don McKinnon Editor Editor Harman International Glenn Hess Editor Plantronics Steve Graham Editor AST Technology Labs James Bress IEEE STIT John Bareham Innovation, Science and Economic Development Canada Magdoly Rondon Innovation, Science and Economic Deve
42、lopment Canada Jason Nixon Microsoft Robert Aichner Microsoft Hong Sodoma Plantronics Bill Rains Plantronics Allen Woo Texas Instruments Warren Karapetian Uniden Al Baum Whitesell Consulting LLC Steve Whitesell Copyrighted parts of ISO 3 are used with permission of the ISO. The ISO owns the copyrigh
43、t for the ISO Standards. Suggestions for improvement of this standard are welcome. They should be sent to: Telecommunications Industry Association Technology and Standards Department Suite 200 1320 North Courthouse Road Arlington, VA 22201 ( http:/www.tiaonline.org ) ANSI/TIA-920.120-B v INTRODUCTIO
44、N This Standard establishes voice transmission performance requirements for speakerphone-equipped digital interface communications devices. For devices that also have a handset or headset or both, standards TIA-920.110-B and TIA-920.130-A, respectively, apply. ANSI/TIA-920.120-A included the additio
45、n of output level measurements for send and receive. Also, send and receive parameters could be measured using either the output level method or the loudness rating method. The current revision only utilizes output level measurements (removes the loudness rating method) and combines the wideband req
46、uirements previously found in TIA-920.120-A and the narrowband speakerphone requirements previously found in ANSI/TIA-810-B into one document with full American National Standard (ANS) status. Although wideband is defined as covering 100 to 7000 Hz, the audio bandwidth of the wideband devices covere
47、d by this Standard is generally limited to approximately 150 to 6800 Hz for practical reasons. The bandwidth of the narrowband devices is approximately 300 to 3400 Hz. Test setup arrangements for handheld devices with speakerphone such as cordless handsets have been added. The nomenclature in the st
48、andard has been changed from “telephones” to “communications devices” in recognition that the products covered extend well beyond the traditional concept of a telephone. Finally, the structure of the document has been modified to place the requirements for receive performance before those for send p
49、erformance since the establishment of the Nominal Volume Control Setting is a necessary prerequisite for many of the tests. ANSI/TIA-920.120-B 1 COMMUNICATIONS PRODUCTS TRANSMISSION REQUIREMENTS FOR DIGITAL INTERFACE COMMUNICATIONS DEVICES WITH SPEAKERPHONES 1 SCOPE This standard establishes transmission performance requirements for speakerphone devices that function as narrowband (300 to 3400 Hz) or wideband (100 to 7000 Hz)1 digital interface communica
