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23、EMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-920.110-B TABLE OF CONTENTS FOREWORD vi INTRODUCTION viii 1 SCOPE 1 1.1 FCC PART 68 1 1.2 ENVIRONMENTAL . 1 1.3 SAFETY . 1 2 NORMATIVE REFERENCES 2 3 DEFINITIONS, ABBREVIATIONS AND
24、 ACRONYMS 3 3.1 DEFINITIONS . 3 3.2 ABBREVIATIONS AND ACRONYMS . 4 4 TESTING CONSIDERATIONS 6 4.1 GENERAL 6 4.1.1 Acoustic Test Interface Equipment .6 4.1.2 Test Signals .6 4.1.3 Test Position 6 4.1.4 Test Methods .6 4.1.5 Test Points and Range of Requirements 6 4.1.6 Subjective Tests .6 4.1.7 Test
25、Environment Background Noise 6 4.2 REFERENCE CODECS 7 4.2.1 IETF RFC 3551 L16-256 Wideband Reference Codec 7 4.2.2 ITU-T Recommendation G.711 Narrowband Reference Codec .8 4.2.3 Other Reference Codecs 8 4.3 PRECAUTIONS. 8 4.4 TEST ARRANGEMENTS . 9 4.4.1 Reference Codec Arrangement .9 4.4.2 Direct Di
26、gital Signal Generation and Analysis Arrangement .9 4.4.3 Receive General Test Setup Arrangement 10 4.4.4 Send General Test Setup Arrangement .10 4.4.5 Sidetone General Test Setup Arrangement .10 4.4.6 Terminal Coupling Loss Test Setup Arrangement 11 5 TECHNICAL REQUIREMENTS 12 5.1 CATEGORIES OF CRI
27、TERIA . 12 5.2 COMPLIANCE WITH THE STANDARD 12 5.3 RECEIVE PERFORMANCE 13 5.3.1 Listener Reference Point .13 5.3.2 Determination of Nominal Volume Control Setting .13 5.3.3 Receive Frequency Response 14 5.3.4 Receive Output 17 5.3.5 Receive Volume Control Conversational Gain 17 5.3.6 Receive Noise I
28、dle Channel .18 5.3.7 Receive Single Frequency Interference (SFI) Idle Channel .18 i TIA-920.110-B 5.3.8 Receive Noise Active Channel .19 5.3.9 Receive Distortion and Noise 19 5.3.10 Receive Distortion Maximum Volume Control Setting 20 5.3.11 Receive Delay 20 5.3.12 Receive Comfort Noise (Advisory)
29、.21 5.3.13 Magnetic Field for Hearing Aid Coupling 22 5.4 SEND PERFORMANCE . 23 5.4.1 Send Frequency Response .23 5.4.2 Send Output .26 5.4.3 Send Noise Without Stimulus 26 5.4.4 Send Single Frequency Interference (SFI) Idle Channel 26 5.4.5 Send Noise With Stimulus .27 5.4.6 Send Distortion and Noi
30、se .27 5.4.7 Send Delay 28 5.5 TALKER SIDETONE PERFORMANCE 29 5.5.1 Sidetone Masking Rating (STMR) 29 5.5.2 Sidetone Delay 29 5.6 ECHO RETURN LOSS AND STABILITY. 31 5.6.1 Weighted Terminal Coupling Loss (TCLw) .31 5.6.2 Stability Loss .32 5.7 OBJECTIVE SPEECH QUALITY 34 ANNEX A (NORMATIVE) CALCULATI
31、ON OF LOUDNESS RATINGS AND SIDETONE MASKING RATING . 35 A.1 SEND LOUDNESS RATING: . 35 A.2 RECEIVE LOUDNESS RATING: 36 A.3 SIDETONE MASKING RATING: 36 ANNEX B (NORMATIVE) DRP TO FF AND DRP TO DF TRANSFER FUNCTIONS 39 B.1 DRP TO FF TRANSFER FUNCTION 39 B.2 DRP TO DF TRANSFER FUNCTION . 41 ANNEX C (NO
32、RMATIVE) DRP TO ERP TRANSFER FUNCTION . 43 ANNEX D (NORMATIVE) A-WEIGHTING CURVE . 45 ANNEX E (NORMATIVE) PULSED NOISE SIGNAL-TO-DISTORTION-AND-NOISE RATIO (PN-SDNR) . 46 ANNEX F (INFORMATIVE) RECOMMENDATIONS FOR SUBJECTIVE QUALITY EVALUATION. 49 F.1 SEND LOUDNESS 50 F.2 SEND NOISE 50 F.3 SEND DISTO
33、RTION 50 F.4 RECEIVE LOUDNESS . 51 F.5 RECEIVE NOISE 51 F.6 RECEIVE DISTORTION 52 F.7 ACOUSTIC ECHO CANCELLATION PERFORMANCE DURING SINGLE-TALK 52 F.8 ACOUSTIC ECHO CANCELLATION PERFORMANCE DURING DOUBLE-TALK 53 ii TIA-920.110-B ANNEX G (INFORMATIVE) RECOMMENDATIONS FOR OBJECTIVE SOUND QUALITY EVALU
34、ATION. 54 G.1 GENERAL INFORMATION 54 G.2 SEND SPEECH QUALITY IN THE PRESENCE OF BACKGROUND NOISE . 54 G.3 OBJECTIVE LISTENING QUALITY (MOS-LQO) 55 ANNEX H (INFORMATIVE) VOLUME CONTROL RESET AND OVERRIDE INFORMATION 57 ANNEX I (INFORMATIVE) RECEIVE ASSISTIVE FEATURES . 58 I.1 HANDSET RECEIVE TONE CON
35、TROL 58 I.2 HANDSET RECEIVE AUTOMATIC GAIN CONTROL (AGC) 58 I.3 HANDSET RECEIVE AUTOMATIC LEVEL ENHANCEMENT (ALE) . 58 ANNEX J (INFORMATIVE) MEASUREMENT AND LEVEL CONVERSIONS . 59 ANNEX K (INFORMATIVE) ISO FREQUENCIES . 60 ANNEX L (INFORMATIVE) CODEC REFERENCE POINT DEFINITIONS 62 ANNEX M (INFORMATI
36、VE) BIBLIOGRAPHY 64 iii TIA-920.110-B TABLE OF FIGURES Figure 1 Digital Communications Device Test Arrangement with Reference Codec . 9 Figure 2 Digital Communications Device Test Arrangement using Direct Digital . 9 Figure 3 Receive Test Setup Arrangement 10 Figure 4 Send Test Setup Arrangement . 1
37、0 Figure 5 Test Circuit for Sidetone Measurements . 10 Figure 6 Terminal Coupling Loss Test Setup Arrangement 11 Figure 7 Wideband Receive Frequency Response Limits . 15 Figure 8 Narrowband Receive Frequency Response Limits 16 Figure 9 Wideband Send Frequency Response Limits 24 Figure 10 Narrowband
38、Send Frequency Response Limits . 25 Figure 11 Reference Corner . 33 Figure B.1 DRP to FF Transformation Curve 40 Figure B.2 DRP to DF Transformation Curve . 42 Figure C.1 DRP to ERP Transformation Curve . 44 Figure D.1 A-Weighting Curve . 45 Figure E.1 Stimulus, Measurement, and Analysis Bands for P
39、N-SDNR . 46 iv TIA-920.110-B TABLE OF TABLES Table 1 L16-256 Periodic Sequence for Producing a 1 kHz, 0 dBm0 Sine Wave . 7 Table 2 G.711 Periodic Sequence for Producing a 1 kHz, 0 dBm0 Sine Wave 8 Table 3 Wideband Receive Frequency Response Limits . 15 Table 4 Narrowband Receive Frequency Response L
40、imits . 16 Table 5 Receive Delay Requirements 20 Table 6 Wideband Send Frequency Response Limits 24 Table 7 Narrowband Send Frequency Response Limits 25 Table 8 Send Delay Requirements . 28 Table A.1 Weighting Factors for Wideband Loudness Ratings and Sidetone Masking Rating 37 Table A.2 Weighting F
41、actors for Narrowband Loudness Ratings . 38 Table B.1 DRP to FF Transformation Values at 1/12 thOctave Center Frequencies . 39 Table B.2 DRP to FF Transformation Values at R40 Frequencies 40 Table B.3 DRP to DF Transformation Values at 1/12 thOctave Center Frequencies . 41 Table B.4 DRP to DF Transf
42、ormation Values at R40 Frequencies . 42 Table C.1 DRP to ERP Correction Factors at 1/12 thOctave Frequencies . 43 Table C.2 DRP to ERP Correction Factors at R40 Frequencies 44 Table D.1 A-Weighting Curve . 45 Table E.1 Stimulus and Stimulus Measurement Bands for PN-SDNR 47 Table E.2 Distortion Analy
43、sis Notch Bands for PN-SDNR 48 Table G.1 MOS-LQO Recommendations 54 Table G.2 Receive MOS-LQO Recommendations 55 Table G.3 Send MOS-LQO Recommendations . 56 Table K.1 ISO R-40, ISO R-10, 1/12 thOctave and 1/3 rdOctave Frequencies . 60 Table L.1 0 dBm0 Reference Point for Various Codecs 62 v TIA-920.
44、110-B 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 procedural guidelines, and represents the consensus position of the Working Group
45、 and its parent Subcommittee TR-41.3, which served as the formulating group. There are thirteen annexes in this Standard. Annexes A E are normative and are considered part of this Standard. Annexes F M are informative and are not considered part of this Standard. The leadership of the TR-41.3.3 VoIP
46、 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 Version TIA-920.110-B Whitesell Consulting LLC Steve Whitesell Editor
47、 Texas Instruments Tom Harley Editor Texas Instruments Warren Karapetian Editor AST Technology Labs, Inc. Don McKinnon Editor AST Technology Labs, Inc. James Bress Bob Young & Associates Bob Young Century Link Amar Ray Cisco Systems Tim Lawler Consultant in Electroacoustics John Bareham IEEE Working Group on Communication Electroacoustics John Bareham Industry Canada Jason Nixon Industry Canada Magdoly Rondon Microsoft Hong Sodoma MWM Acoustics Glenn Hess Nortel Networks Roger Britt Plantronics Steve Graham Plantronics Bill Rains Plantronics Allen Woo Uniden Al Baum VTech Steve Whitesell vi
