1、 TIA-920.123 March 2018Telecommunications Communications Products Transmission Requirements for Digital Interface Communications Devices with Group Speakerphones ANSI/TIA-920.123-2018 APPROVED: MARCH 16, 2018 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest
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23、 HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-920.123 Telecommunications Communications Products Transmission Requirements for Digital Interface Communications Devices with Group Speakerphones Formulated under the cognizance of TIA Subcommittee TR-41.3
24、Analog and Digital Wireline Terminals With the approval of TIA Engineering Committee TR-41 Performance and Accessibility for Communications Products ANSI/TIA-PN-920.123 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 E
25、VALUATION 1 1.3 ENVIRONMENTAL . 2 1.4 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 7 4.1.2 Acoustic Test Interface Equipment .7 4.1.3 Test Signals
26、 .8 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 9 4.3.1 IETF RFC 3551 L16-256 Wideband Reference Codec 9 4.3.2 ITU-T Recommendation G.711 Narrowband Reference Codec .10 4.3.3 Other Referen
27、ce 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 12 4.4.5 Send Level Directionality Test Arrangement 13 4.4.6
28、Terminal Coupling Loss Test Setup Arrangements 14 5 TECHNICAL REQUIREMENTS 15 5.1 CATEGORIES OF CRITERIA . 15 5.2 COMPLIANCE WITH THE STANDARD 15 5.3 RECEIVE PERFORMANCE 16 5.3.1 Receive Output 16 5.3.2 Receive Volume Control .17 5.3.3 Receive Frequency Response 18 5.3.4 Receive Noise Idle Channel .
29、21 5.3.5 Receive Single Frequency Interference (SFI) Idle Channel .21 5.3.6 Receive Noise Active Channel .22 ANSI/TIA-PN-920.123 ii 5.3.7 Receive Distortion and Noise 22 5.3.8 Receive Distortion and Noise Maximum Volume Control Setting 23 5.3.9 Receive Delay 23 5.4 SEND PERFORMANCE . 24 5.4.1 Send O
30、utput .24 5.4.2 Send Frequency Response .25 5.4.3 Send Level Directionality (SLD) 28 5.4.4 Send Noise Without Stimulus 28 5.4.5 Send Single Frequency Interference (SFI) Idle Channel 28 5.4.6 Send Noise With Stimulus .29 5.4.7 Send Distortion and Noise .29 5.4.8 Send Delay 30 5.5 WEIGHTED TERMINAL CO
31、UPLING LOSS (TCLW) 31 5.5.1 Requirement 31 5.5.2 Measurement Method 32 5.6 SUBJECTIVE SPEECH QUALITY AND OBJECTIVE SPEECH QUALITY . 32 5.6.1 Subjective Speech Quality .32 5.6.2 Objective Speech Quality 32 ANNEX A (NORMATIVE) CALCULATION OF LOUDNESS RATINGS 33 A.1 SEND LOUDNESS RATING: . 33 A.2 RECEI
32、VE LOUDNESS RATING: 34 ANNEX B (NORMATIVE) TRANSLATION OF RECEIVE FREQUENCY RESPONSE DATA FROM FF TO ERP . 36 ANNEX C (NORMATIVE) PULSED NOISE SIGNAL-TO-DISTORTION-AND-NOISE RATIO (PN-SDNR) . 38 ANNEX D (INFORMATIVE) RECEIVE ASSISTIVE FEATURES 41 D.1 SPEAKERPHONE RECEIVE TONE CONTROL 41 D.2 SPEAKERP
33、HONE RECEIVE AUTOMATIC GAIN CONTROL (AGC) 41 D.3 SPEAKERPHONE RECEIVE AUTOMATIC LEVEL ENHANCEMENT (ALE) . 41 ANNEX E (INFORMATIVE) MEASUREMENT AND LEVEL CONVERSIONS 42 ANNEX F (INFORMATIVE) ISO FREQUENCIES . 43 ANNEX G (INFORMATIVE) CODEC REFERENCE POINT DEFINITIONS . 45 ANNEX H (INFORMATIVE) BIBLIO
34、GRAPHY . 46 ANSI/TIA-PN-920.123 iii TABLE OF FIGURES Figure 1 Digital Communications Device Test Arrangement with Reference Codec 11 Figure 2 Digital Communications Device Test Arrangement using Direct Digital 11 Figure 3 Receive Test Setup Arrangement . 12 Figure 4 Send Test Setup Arrangement 12 Fi
35、gure 5 Send Level Directionality Test Setup 13 Figure 6 Terminal Coupling Loss Test Setup Arrangement . 14 Figure 7 Wideband Receive Frequency Response Limits 19 Figure 8 Narrowband Receive Frequency Response Limits . 20 Figure 9 Wideband Send Frequency Response Limits . 26 Figure 10 Narrowband Send
36、 Frequency Response Limits 27 Figure B.1 FF to ERP Transformation Curve . 37 Figure C.1 Stimulus, Measurement, and Analysis Bands for PN-SDNR . 38 TABLE OF TABLES Table 1 L16-256 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
37、 Sine Wave . 10 Table 3 Wideband Receive Frequency Response Limits 19 Table 4 Narrowband Receive Frequency Response Limits 20 Table 5 Wideband Send Frequency Response Limits. 26 Table 6 Narrowband Send Frequency Response Limits . 27 Table A.1 Weighting Factors for Wideband Loudness Ratings and Sidet
38、one Masking Rating . 34 Table A.2 Weighting Factors for Narrowband Loudness Ratings 35 Table B.1 FF to ERP Translation Values at 1/12 Octave Band Center Frequencies 36 Table B.2 FF to ERP Translation Values at R40 Frequencies 37 Table C.1 Stimulus and Stimulus Measurement Bands for PN-SDNR 39 Table
39、C.2 Distortion Analysis Notch Bands for PN-SDNR . 40 Table F.1 ISO R-40, ISO R-10, 1/12 Octave and 1/3 Octave Frequencies . 43 Table G.1 0 dBm0 Reference Point for Various Codecs 45 ANSI/TIA-PN-920.123 iv FOREWORD (This foreword is not part of this standard.) This document is a TIA Telecommunication
40、s 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 served as the formulating group. There are eight annexes
41、in this Standard. Annexes A-C are normative and are considered part of this Standard. Annexes D H are informative and are not considered part of this Standard. The leadership of the TR-41.3.3 Digital Interface Communications Device Working Group (Chair: Allen Woo, Plantronics) acknowledges the writt
42、en contributions provided by the following individuals in the development of this standard. Organization Representative TIA-920.123 AST Technology Labs Don McKinnon Editor Whitesell Consulting LLC Stephen Whitesell Copyrighted parts of ITU-T Recommendation P.79 are used with permission of the ITU. T
43、he 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. Suggestions for improvement of this standard are welcome. They should be sent to: Telecommunications Industry Association Technolog
44、y and Standards Department Suite 200 1320 North Courthouse Road Arlington, VA 22201 ( http:/www.tiaonline.org ) ANSI/TIA-PN-920.123 v INTRODUCTION This Standard establishes voice transmission performance requirements for group speakerphone digital interface communications devices. For devices that a
45、lso have a handset or headset or both, standards TIA-920.110-B and TIA-920.130-B, respectively, apply. Group speakerphones are devices intended to be used by multiple individuals in a small to medium setting with users at a distance further away (up to approximately 3 meters (10 feet) than those for
46、 personal speakerphones (typically transmission mode only. ANSI/TIA-PN-920.123 16 5.3 RECEIVE PERFORMANCE The receive performance of a communications device is determined by its electrical-to-acoustical transfer characteristics. To determine the receive performance, requirements for frequency respon
47、se, acoustic output level, distortion, noise, volume control and delay are specified. The test setup arrangement shown in Figure 3 is used for all receive measurements. Some tests do not require the application of an input test signal to the reference codec. As discussed in 4.4.2, direct digital pro
48、cessing may be used for generating the receive bit stream signal in place of the reference codec. If the DUT has an adjustable receive tone control, the tone setting that provides the best tolerance margin to the upper and lower frequency response limits per the measurement method in clause 5.3.3 sh
49、all be used with all other requirements in this Standard. The Nominal Volume Control Setting is to be used when testing for compliance with all other requirements in this Standard unless specified otherwise. Refer to the test procedure in 5.3.1. All receive testing should be performed after a stabilization stimulus of the same amplitude and duration as the primary test signal to ensure the DUT is stable. It may be necessary to repeat the stabilization stimulus until DUT stabilization is reached.
