1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T P.1130 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2015) SERIES P: TERMINALS AND SUBJECTIVE AND OBJECTIVE ASSESSMENT METHODS Communications involving vehicles Subsystem requirements for automotive speech services Re
2、commendation ITU-T P.1130 ITU-T P-SERIES RECOMMENDATIONS TERMINALS AND SUBJECTIVE AND OBJECTIVE ASSESSMENT METHODS Vocabulary and effects of transmission parameters on customer opinion of transmission quality Series P.10 Voice terminal characteristics Series P.30 P.300 Reference systems Series P.40
3、Objective measuring apparatus Series P.50 P.500 Objective electro-acoustical measurements Series P.60 Measurements related to speech loudness Series P.70 Methods for objective and subjective assessment of speech quality Series P.80 P.800 Audiovisual quality in multimedia services Series P.900 Transm
4、ission performance and QoS aspects of IP end-points Series P.1000 Communications involving vehicles Series P.1100 Models and tools for quality assessment of streamed media Series P.1200 Telemeeting assessment Series P.1300 Statistical analysis, evaluation and reporting guidelines of quality measurem
5、ents Series P.1400 Methods for objective and subjective assessment of quality of services other than voice services Series P.1500 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T P.1130 (06/2015) i Recommendation ITU-T P.1130 Subsystem requirements for automotive sp
6、eech services Summary Recommendation ITU-T P.1130 defines test methodologies for and standard behaviour of subsystems used in automotive speakerphone terminals. The purpose of this Recommendation is to provide guidance on the design and optimization of such subsystems, as well as the diagnostic capa
7、bilities needed to give a consistent and high quality of service of the overall speakerphone terminal to the users of such devices. This specification is intended to give guidance to all parties involved in the design and integration of speakerphone terminals. This Recommendation covers both narrowb
8、and and wideband systems. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T P.1130 2015-06-29 12 11.1002/1000/12518 Keywords Hands-free, motor vehicles, performance, quality of service, speakerphone, subsystem. _ * To access the Recommendation, type the URL http:/handle.itu.in
9、t/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/ 11830-en. ii Rec. ITU-T P.1130 (06/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommu
10、nications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommuni
11、cations on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedu
12、re laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecom
13、munication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of thes
14、e mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU d
15、raws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members
16、 or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not r
17、epresent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T P.1130 (0
18、6/2015) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 4 Abbreviations and acronyms 4 5 Conventions 8 6 How to use this Recommendation 9 7 Architectures . 9 7.1 Distributed speakerphone . 10 7.2 System with integrated microphone . 11 7.3 System with integrated speaker 12 7.4
19、 System with integrated microphone and speaker . 13 8 Subsystems . 13 8.1 System delay, subsystem delay and buffering 13 8.2 Test interface description . 13 8.3 Acoustic subsystem 15 8.4 Signal enhancement subsystem 49 9 Bidirectional signal transport including network transport 106 9.1 Bidirectiona
20、l transport delay in send direction . 108 9.2 Clock drift in send direction . 109 9.3 Bidirectional transport delay in receive direction 109 9.4 Clock drift in receive direction . 110 9.5 Bidirectional transport send junction loudness ratings . 111 9.6 Bidirectional transport receive loudness rating
21、s . 112 9.7 Bidirectional transport linearity in send direction 113 9.8 Bidirectional transport linearity in receive direction 114 9.9 Bidirectional transport send sensitivity frequency response 115 9.10 Bidirectional transport receive sensitivity frequency response 117 9.11 Bidirectional transport
22、idle channel noise in send 120 9.12 Bidirectional transport idle channel noise in receive 121 9.13 Bidirectional transport noise cancellation test in send direction 122 9.14 Bidirectional transport one-way speech quality in send direction 123 9.15 Bidirectional transport speech quality stability in
23、send direction 124 9.16 Bidirectional transport one-way speech quality in receive direction . 126 9.17 Bidirectional transport speech quality stability in receive direction 127 9.18 Verification of bidirectional transport disabled echo control . 128 9.19 Bidirectional transport subsystem weighted te
24、rminal coupling loss (TCLwBD) and (TCLBD) 130 10 Unidirectional signal transport: Wired and short range wireless transmission 131 iv Rec. ITU-T P.1130 (06/2015) Page 10.1 Test set-up 131 10.2 Unidirectional transport delay 132 10.3 Unidirectional clock drift . 133 10.4 Unidirectional transport junct
25、ion loudness ratings . 134 10.5 Unidirectional transport linearity . 135 10.6 Unidirectional transport sensitivity frequency response 135 10.7 Unidirectional transport idle channel noise 138 10.8 Unidirectional transport noise cancellation test . 139 10.9 Unidirectional transport speech quality 140
26、10.10 Unidirectional transport speech quality stability 141 Annex A Microphone measurements in anechoic conditions . 144 A.1 Microphone sensitivity (in anechoic conditions) . 144 A.2 Microphone frequency response (in anechoic conditions) . 145 A.3 Microphone directional characteristics (in anechoic
27、conditions) . 148 A.4 Microphone distortion (in anechoic conditions) . 148 A.5 Microphone maximum sound pressure level (in anechoic conditions) 149 A.6 Microphone dynamic range (in anechoic conditions) 150 Annex B Standard set of user scenarios 152 Annex C Frame process and delay 154 C.1 General . 1
28、54 C.2 Frame interval . 154 C.3 Delay . 154 C.4 Arbitration between two subsystems with different frame intervals 155 C.5 Subsystem delay and relationship to overall delay . 156 C.6 Example 157 Appendix I Testing for Noise Distortion 160 I.1 Parameter description . 160 I.2 Test . 160 I.3 Classificat
29、ion of performance level based on values of this parameter . 161 I.4 Design guidance and root-cause analysis . 162 Appendix II Reference-free SNR measurement . 163 II.1 Introduction 163 II.2 Signal-to-noise ratio measurement . 163 II.3 Noise variance tracking and voice activity detection . 164 II.4
30、Speech pause detection . 165 II.5 Measurement set-up 166 Appendix III Measuring and applying impulse response traces for dynamic test conditions 167 III.1 Introduction 167 Rec. ITU-T P.1130 (06/2015) v Page III.2 Excitation signal . 167 III.3 Measurement Set-up . 168 III.4 System model . 168 III.5 S
31、ignal convolution 168 Bibliography. 169 Rec. ITU-T P.1130 (06/2015) 1 Recommendation ITU-T P.1130 Subsystem requirements for automotive speech services 1 Scope The aim of this Recommendation is to define test methods and requirements for subsystems of automotive narrowband and wideband speakerphone
32、terminals and other speech services using the speakerphones acoustic interface. This Recommendation covers the following: definition of subsystems based on different system architectures; performance requirements for subsystems; diagnostic information; guidance on component and subsystem optimizatio
33、n; coordination of subsystems; both narrowband and wideband systems; acoustic interface requirements for other speech services such as speech recognition and application prompt playback. The methods, the analysis and the performance parameters described in this Recommendation are based on test signa
34、ls and test procedures defined in ITU-T P.501, ITU-T P.502, ITU-T P.340, ITU-T P.1100, ITU-T P.1110, b-ETSI ES 202 739 and b-ETSI ES 202 740. Several performance classes are defined for each performance parameter instead of a single pass/fail criterion. This enables easier interpretation of the perf
35、ormance levels achieved and provides more flexibility in specifying the required performance level of a subsystem. Lower numbered classes have more stringent requirements and represent higher performance levels. Note that all limits in this version of the Recommendation are considered provisional du
36、e to the lack of verification data. Furthermore, the interpretation of the performance classes deserves further study. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the
37、time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below.
38、 A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.100.1 Recommendation ITU-T G.100.1 (in force), The use of the decibel and of relati
39、ve levels in speechband telecommunications. ITU-T G.114 Recommendation ITU-T G.114 (in force), One-way transmission time. ITU-T G.122 Recommendation ITU-T G.122 (in force), Influence of national systems on stability and talker echo in international connections. ITU-T G.131 Recommendation ITU-T G.131
40、 (in force), Talker echo and its control. ITU-T O.41 Recommendation ITU-T O.41 (in force), Psophometer for use on telephone-type circuits. 2 Rec. ITU-T P.1130 (06/2015) ITU-T P.56 Recommendation ITU-T P.56 (in force), Objective measurement of active speech level. ITU-T P.57 Recommendation ITU-T P.57
41、 (in force), Artificial ears. ITU-T P.58 Recommendation ITU-T P.58 (in force), Head and torso simulators for telephonometry. ITU-T P.79 Recommendation ITU-T P.79 (in force), Calculation of loudness rating for telephone sets. ITU-T P.340 Recommendation ITU-T P.340 (in force), Transmission characteris
42、tics and speech quality parameters of hands-free telephones. ITU-T P.341 Recommendation ITU-T P.341 (in force), Characteristics of Wideband Terminals. ITU-T P.501 Recommendation ITU-T P.501 (in force), Test signals for use in telephonometry. ITU-T P.502 Recommendation ITU-T P.502 (in force), Objecti
43、ve Analysis Methods for Speech Communication Systems, Using Complex Test Signals. ITU-T P.581 Recommendation ITU-T P.581 (in force), Use of head and torso simulators (HATS) for hands-free terminal testing. ITU-T P.800 Recommendation ITU-T P.800 (in force), Methods for subjective determination of tra
44、nsmission quality. ITU-T P.800.1 Recommendation ITU-T P.800.1 (in force), Mean Opinion Score (MOS) terminology. ITU-T P.830 Recommendation ITU-T P.830 (in force), Subjective performance assessment of telephone-band and wideband digital codecs. ITU-T P.863 Recommendation ITU-T P.863 (in force), Metho
45、ds for objective and subjective assessment of speech quality. ITU-T P.1100 Recommendation ITU-T P.1100 (in force), Narrowband hands-free communication in motor vehicles. ITU-T P.1110 Recommendation ITU-T P.1110 (in force), Wideband hands-free communication in motor vehicles. IEC 60268-4 IEC 60268-4
46、(2004), Sound system equipment Part 4: Microphones. IEC 61260 IEC 61260:2014, Electroacoustics Octave-band and fractional-octave-band filters Part 1: Specifications. ISO 1999 ISO 1999:2013, Acoustics Estimation of noise-induced hearing loss. ISO 3745 ISO 3745:2012, Acoustics Determination of sound p
47、ower levels of noise sources using sound pressure Precision methods for anechoic and hemi-anechoic rooms. 3 Definitions This Recommendation defines the following terms: 3.1 artificial ear: Device incorporating an acoustic coupler and a calibrated microphone for the measurement of sound pressure and
48、which has an overall acoustic impedance similar to that of the median adult human ear over a given frequency band. Rec. ITU-T P.1130 (06/2015) 3 3.2 codec: Combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions of transmission in the same equ
49、ipment. 3.3 composite source signal (CSS): Signal composed in time by various signal elements. 3.4 diffuse field equalization: Equalization of the HATS sound pick-up, equalization of the difference, in dB, between the spectrum level of the acoustic pressure at the eardrum reference point (DRP) and the spectrum level of the acoustic pressure at the HATS reference point (HRP) in a diffuse sound field with the HATS absent using the
