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23、OF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-920.130-B i TABLE OF CONTENTS FOREWORD V INTRODUCTION . VI 1 SCOPE 1 1.1 ENVIRONMENTAL . 1 1.2 SAFETY . 1 2 NORMATIVE REFERENCES 2 3 DEFINITIONS, ABBREVIATIONS AND ACRONYMS 3 3.1 DEFINITIONS . 3 3.2 ABBREVIATIONS
24、 AND ACRONYMS . 5 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 Subjective Tests .7 4.1.6 Test Environment Background Noise 7 4.2 REFERENCE CODECS 8 4.2.1 IETF RFC 3551 L16-256 Wideband Refe
25、rence Codec 8 4.2.2 ITU-T Recommendation G.711 Narrowband Reference Codec .9 4.2.3 Other Reference Codecs 9 4.3 PRECAUTIONS. 9 4.4 TEST ARRANGEMENTS . 10 4.4.1 Reference Codec Arrangement .10 4.4.2 Direct Digital Signal Generation and Analysis Arrangement .10 4.4.3 Receive General Test Setup Arrange
26、ment 11 4.4.4 Send General Test Setup Arrangement .11 4.4.5 Sidetone General Test Setup Arrangement .11 4.4.6 Terminal Coupling Loss Test Setup Arrangement 12 5 TECHNICAL REQUIREMENTS 13 5.1 CATEGORIES OF CRITERIA . 13 5.2 COMPLIANCE WITH THE STANDARD 13 5.3 RECEIVE PERFORMANCE 14 5.3.1 Listener Ref
27、erence Point .14 5.3.2 Determination of Nominal Volume Control Setting .15 5.3.3 Receive Output 15 5.3.4 Receive Volume Control Range 16 5.3.5 Receive Frequency Response 17 5.3.6 Receive Noise Idle Channel .20 5.3.7 Receive Single Frequency Interference (SFI) Idle Channel .20 5.3.8 Receive Noise Act
28、ive Channel .20 5.3.9 Receive Distortion and Noise 21 ANSI/TIA-920.130-B ii 5.3.10 Receive Distortion Volume Control Setting .21 5.3.11 Receive Delay 22 5.4 SEND PERFORMANCE . 22 5.4.1 Send Output .23 5.4.2 Send Frequency Response .23 5.4.3 Send Noise Without Stimulus 26 5.4.4 Send Single Frequency
29、Interference (SFI) Idle Channel 26 5.4.5 Send Noise Active Channel 27 5.4.6 Send Distortion and Noise .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. 30 5.6.1 Weighted Terminal Coupling Los
30、s (TCLw) .30 5.6.2 Stability Loss .31 5.7 SPEECH QUALITY . 33 5.7.1 Subjective Speech Quality .33 5.7.2 Objective Speech Quality 33 ANNEX A (NORMATIVE) CALCULATION OF LOUDNESS RATINGS AND SIDETONE MASKING RATING . 34 A.1 SEND LOUDNESS RATING: . 34 A.2 RECEIVE LOUDNESS RATING: 35 A.3 SIDETONE MASKING
31、 RATING: 35 ANNEX B (NORMATIVE) DRP TO FF AND DRP TO DF TRANSFER FUNCTIONS 38 B.1 DRP TO FF TRANSFER FUNCTION 38 B.2 DRP TO DF TRANSFER FUNCTION . 40 ANNEX C (NORMATIVE) DRP TO ERP TRANSFER FUNCTION . 42 ANNEX D (NORMATIVE) A-WEIGHTING CURVE 44 ANNEX E (NORMATIVE) PULSED NOISE SIGNAL-TO-DISTORTION-A
32、ND-NOISE RATIO (PN-SDNR) . 45 ANNEX F (INFORMATIVE) RECEIVE ASSISTIVE FEATURES 48 F.1 HEADSET RECEIVE TONE CONTROL 48 F.2 HEADSET RECEIVE AUTOMATIC GAIN CONTROL (AGC) 48 F.3 HEADSET RECEIVE AUTOMATIC LEVEL ENHANCEMENT (ALE) . 48 ANNEX G (INFORMATIVE) MEASUREMENT AND LEVEL CONVERSIONS 49 ANNEX H (INF
33、ORMATIVE) ISO FREQUENCIES . 50 ANNEX I (INFORMATIVE) CODEC REFERENCE POINT DEFINITIONS . 52 ANNEX J (INFORMATIVE) BIBLIOGRAPHY . 53 ANSI/TIA-920.130-B iii TABLE OF FIGURES Figure 1 Digital Communications Device Test Arrangement with Reference Codec 10 Figure 2 Digital Communications Device Test Arra
34、ngement using Direct Digital 10 Figure 3 Receive Test Setup Arrangement . 11 Figure 4 Send Test Setup Arrangement 11 Figure 5 Test Circuit for Sidetone Measurements 11 Figure 6 Terminal Coupling Loss Test Setup Arrangement . 12 Figure 7 Wideband Receive Frequency Response Limits 18 Figure 8 Narrowba
35、nd Receive Frequency Response Limits . 19 Figure 9 Wideband Send Frequency Response Limits . 24 Figure 10 Narrowband Send Frequency Response Limits 25 Figure 11 Reference Corner 32 Figure B.1 DRP to FF Transformation Curve . 39 Figure B.2 DRP to DF Transformation Curve 41 Figure C.1 DRP to ERP Trans
36、formation Curve 43 Figure D.1 A-Weighting Curve 44 Figure E.1 Stimulus, Measurement, and Analysis Bands for PN-SDNR 45 ANSI/TIA-920.130-B iv TABLE OF TABLES Table 1 L16-256 Periodic Sequence for Producing a 1 kHz, 0 dBm0 Sine Wave 8 Table 2 G.711 Periodic Sequence for Producing a 1 kHz, 0 dBm0 Sine
37、Wave . 9 Table 3 Wideband Receive Frequency Response Limits 18 Table 4 Narrowband Receive Frequency Response Limits 19 Table 5 Wideband Send Frequency Response Limits. 24 Table 6 Narrowband Send Frequency Response Limits . 25 Table A.1 Weighting Factors for Wideband Loudness Ratings and Sidetone Mas
38、king Rating . 36 Table A.2 Weighting Factors for Narrowband Loudness Ratings 37 Table B.1 DRP to FF Transformation Values at 1/12 Octave Center Frequencies 38 Table B.2 DRP to FF Transformation Values at R40 Frequencies . 39 Table B.3 DRP to DF Transformation Values at 1/12 Octave Center Frequencies
39、 40 Table B.4 DRP to DF Transformation Values at R40 Frequencies 41 Table C.1 DRP to ERP Correction Factors at 1/12 Octave Frequencies 42 Table C.2 DRP to ERP Correction Factors at R40 Frequencies . 43 Table D.1 A-Weighting Curve 44 Table E.1 Stimulus and Stimulus Measurement Bands for PN-SDNR. 46 T
40、able E.2 Distortion Analysis Notch Bands for PN-SDNR . 47 Table H.1 ISO R-40, ISO R-10, 1/12 Octave and 1/3 Octave Frequencies 50 Table I.1 0 dBm0 Reference Point for Various Codecs 52 ANSI/TIA-920.130-B v FOREWORD (This foreword is not part of this standard.) This document is a TIA Telecommunicatio
41、ns 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 eleven annexe
42、s in this Standard. Annexes A E are normative and are considered part of this Standard. Annexes F K 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 wri
43、tten contributions provided by the following individuals in the development of this standard. Organization Representative Previous Version TIA-920.110-B Plantronics Allen Woo Editor Editor AST Technology Labs, Inc. Don McKinnon Editor Editor Texas Instruments Warren Karapetian Editor AST Technology
44、Labs, Inc. James Bress Bob Young however, if the headset is designed to operate with a specific digital interface communication device, it shall be tested with that device and reported as such. Many products tested for compliance with this standard are expected to support both wideband and narrowban
45、d modes of transmission performance. To be considered compliant with this standard, such products must be tested in each transmission mode and comply with the performance requirements contained herein relevant to that transmission mode. Products that only support one transmission mode are considered
46、 compliant with this standard if they comply with the requirements herein for that mode. However, the test report for such products shall clearly state with which mode they comply by use of wording similar to the following: This product complies with the requirements of ANSI/TIA-920.130-B for the tr
47、ansmission mode only. ANSI/TIA-920.130-B 14 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 acoustic output level, frequency response, distortion,
48、 noise, volume control and delay are specified. The test setup arrangements shown in 4.4.3 are 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 processing may be used for generating the
49、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 5.3.5 shall 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.
