1、TIA-5047 June 2018Telecommunications Communications Products Speech Quality Subjective Measurement Procedures and Performance Recommendations NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and pu
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20、7 i Table of Contents FOREWORD II 1 SCOPE 1 2 NORMATIVE REFERENCES 2 3 DEFINITIONS, ABBREVIATIONS AND ACRONYMS 3 3.1 DEFINITIONS . 3 3.2 ABBREVIATIONS AND ACRONYMS . 3 4 SUBJECTIVE SPEECH QUALITY EVALUATION PROCEDURES . 4 4.1 ANALOG DEVICES 5 4.1.1 Send Level, Noise and Distortion 5 4.1.2 Receive Le
21、vel, Noise and Distortion .6 4.1.3 Acoustic Echo Cancellation Performance During Single-Talk .7 4.1.4 Acoustic Echo Cancellation Performance During Double-Talk .8 4.2 DIGITAL DEVICES. 9 4.2.1 Send Level, Noise and Distortion 9 4.2.2 Receive Level, Noise and Distortion .10 4.2.3 Acoustic Echo Cancell
22、ation Performance During Single-Talk .11 4.2.4 Acoustic Echo Cancellation Performance During Double-Talk .12 ANNEX A (INFORMATIVE) MEAN OPINION SCORE (MOS) INFORMATION . 13 ANNEX B (INFORMATIVE) OBJECTIVE SPEECH QUALITY INFORMATION . 14 A.1 TEST ROOM CRITERIA 14 A.2 SEND SPEECH QUALITY IN THE PRESEN
23、CE OF BACKGROUND NOISE 14 A.3 OBJECTIVE LISTENING QUALITY (MOS-LQO) 14 ANNEX C (INFORMATIVE) BIBLIOGRAPHY . 15 Table of Tables Table B.1 Listening-Quality Scale 13 Table B.2 ITU-T G.107 Table B.1 Provisional Guide for the Relation Between R-value and User Satisfaction 13 TIA-5047 ii FOREWORD (This f
24、oreword is not part of this standard.) This document is a TIA Telecommunications standard produced by Subcommittee TR-41.3 of Committee TR-41. This standard was developed in accordance with TIA procedural guidelines, and represents the consensus position of the Subcommittee, which served as the form
25、ulating group. There are 3 annexes in this Standard. Annex A, Annex B, and Annex C are informative and are not considered part of this Standard. The leadership of the TR-41.3 Performance and Accessibility for Communication Devices Subcommittee (Chair: Don McKinnon, AST) acknowledges the written cont
26、ributions provided by the following individuals in the development of this standard. Organization Representative TIA-5047 AST Technology Labs Don McKinnon Editor CaptionCall Jeff Bullough ISED Canada Jason Nixon Plantronics Allen Woo Whitesell Consulting LLC Steve Whitesell Suggestions for improveme
27、nt 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 ) TIA-5047 1 COMMUNICATIONS PRODUCTS SPEECH QUALITY SUBJECTIVE MEASUREMENT PROCEDURE
28、S AND PERFORMANCE RECOMMENDATIONS 1 SCOPE This standard establishes the speech quality subjective measurement procedures and performance recommendations for analog and digital communications devices. TIA-5047 2 2 NORMATIVE REFERENCES The following standards contain provisions which, through referenc
29、e in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the sta
30、ndards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. 1. ANSI/TIA-470.110-E-2017, Telecommunications - Telephone Terminal Equipment - Transmission Requirements for Analog Telephones with Handsets. 2. ANSI/TIA-470.120-D-2017, Telecommunicatio
31、ns - Telephone Terminal Equipment - Transmission Requirements for Analog Speakerphones. 3. ANSI/TIA-470.130-C-2008 (R2016), Telecommunications - Telephone Terminal Equipment - Transmission Requirements for Analog Telephones with Headsets. 4. ANSI/TIA-920.110-B-2015, Telecommunications - Communicatio
32、ns Products - Transmission Requirements for Digital Interface Communications Devices with Handsets. 5. ANSI/TIA-920.120-B-2017, Telecommunications - Communications Products - Transmission Requirements for Digital Interface Communications Devices with Speakerphone. 6. ANSI/TIA-920.130-B-2017, Telecom
33、munications - Communications Products - Transmission Requirements for Digital Interface Communications Devices with Headsets. 7. IEEE Std 269-2010, IEEE Standard Methods for Measuring Transmission Performance of Analog and Digital Telephone Sets, Handsets, and Headsets. TIA-5047 3 3 DEFINITIONS, ABB
34、REVIATIONS AND ACRONYMS 3.1 DEFINITIONS For the purposes of this standard, the following definitions apply. Objective Global-MOS (G-MOS): The overall quality including speech and background noise Objective Noise-MOS (N-MOS): The transmission quality of the background noise Objective Speech-MOS (S-MO
35、S): The transmission quality of the speech Far-end: Refers to the user who is talking to the user who is using the device under test Near-end: Refers to the user who is using the device under test (DUT) 3.2 ABBREVIATIONS AND ACRONYMS Abbreviations and acronyms, other than in common usage, which appe
36、ar in this standard, are defined below. DUT Device Under Test MOS Mean Opinion Score MOS-LQO Mean Opinion Score Listening Quality Objective PESQ Perceptual Evaluation of Speech Quality POLQA Perceptual Objective Listening Quality Assessment TOSQA Telecommunication Objective Speech Quality Assessment
37、 TIA-5047 4 4 SUBJECTIVE SPEECH QUALITY EVALUATION PROCEDURES As may be recommended in TIA-470.110-E, TIA-470.120-D, TIA-470.130-C, TIA-920.110-B, TIA-920.120-B, TIA-920.123, and TIA-920.130-B, devices may be evaluated subjectively during an active call scenario with the goal to identify any obvious
38、 problems that may have been missed throughout the objective tests. The evaluation should be performed under normal usage conditions and some stress conditions. Normal usage conditions: Moderately sized room. Room ambient noise level: 35-40 dBA. Hoth noise (see IEEE Std 269) generated from a loudspe
39、aker facing a corner of the room can be used to produce this level of noise. Human speech at normal level, typically 90 dBSPL measured approximately 25mm from the mouth. Receive volume control is set to a comfortable listening level as determined per the applicable device specification. Stressed usa
40、ge conditions: Human speech at quiet level, typically 80 dBSPL, and loud level, typically 100 dBSPL, measured approximately 25mm from the mouth. Receive volume control is set to maximum level or maximum tolerable by the tester. Room ambient noise level: 50-55 dBA. Hoth noise generated from a loudspe
41、aker facing a corner of the room can be used to produce this level of noise. Far-end setup conditions: The far-end talker is located in a quiet office environment with a high quality reference corded handset or binaural corded headset. The conformance of this handset or headset to latest version of
42、TIA-470.110-E /TIA-920.110-B or TIA-470.130-C/TIA-920.130-B, respectively, should be verified. The volume setting should match the nominal receive output setting of 76 dBSPL for the handset or 70 dBSPL for the binaural headset. Speech Phrases/Sentences: The following speech may be used to provide a
43、consistent test scenario. Phrase DUT (Near-End) Tester Reference (Far-End) Tester 1 A speedy man can beat this track mark Oak is strong and also gives shade 2 He broke a new shoelace that day Open the crate but dont break the glass 3 The coffee stand is too high for the couch Thieves who rob friends
44、 deserve jail 4 The urge to write short stories is rare The ripe taste of cheese improves with age TIA-5047 5 4.1 ANALOG DEVICES All tests below require two people. The term near-end user describes the person using the DUT and the term far-end user describes the person in a remote room who is using
45、a reference device to communicate with the near-end user. Ideally a controlled end-to-end test scenario uses a network simulation circuit which allows the DUT to be connected to a farend reference device with control over both the farend and the nearend loop conditions, where each side can have a 0
46、km, 2.7 km and 4.6 km test loop to simulate a range of PSTN connections. At a minimum a call using real lines can be used but the lines lengths are uncontrolled. Network simulation: Two CO Simulator circuits with 0 km, 2.7 km and 4.6 km test loops (See TIA-470.110-E) A CO-to-CO Network with the capa
47、bility for 0 dB and 6 dB network loss 4.1.1 Send Level, Noise and Distortion 4.1.1.1 Purpose 1. The send signal level evaluation is performed to verify the DUT output is sufficient when received by the far-end. 2. The send noise evaluation is performed to verify that no excessive noise is transmitte
48、d from the DUT to the far-end listener. It will also verify that there are no disruptive noise level changes, often referred to as “noise pumping.” 3. The send distortion evaluation is performed to verify that, when the near-end user is speaking, the far-end listener does not perceive distortion due
49、 to microphone or electrical clipping of the DUT. 4.1.1.2 Recommendation The DUT send signal should be loud enough for the far-end user to hear comfortably across the range of loop lengths with acceptable noise and distortion characteristics. 4.1.1.3 Evaluation Procedure 1. Under normal noise conditions, the near-end and far-end are connected on a 0 km loop length and 6 dB of network loss. 2. The near-end talker speaks phrases 1-4 in clause 4 with a normal speech level with a silent pause of 2-4 seconds after each phrase
