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.382 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2016) SERIES P: TERMINALS AND SUBJECTIVE AND OBJECTIVE ASSESSMENT METHODS Voice terminal characteristics Technical requirements and test methods for multi-microphone
2、 wired headset or headphone interfaces of digital wireless terminals Recommendation ITU-T P.382 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 ter
3、minal characteristics Series P.30 P.300 Reference systems Series P.40 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.8
4、0 Methods for objective and subjective assessment of speech and video quality Series P.800 Audiovisual quality in multimedia services Series P.900 Transmission performance and QoS aspects of IP end-points Series P.1000 Communications involving vehicles Series P.1100 Models and tools for quality asse
5、ssment of streamed media Series P.1200 Telemeeting assessment Series P.1300 Statistical analysis, evaluation and reporting guidelines of quality measurements Series P.1400 Methods for objective and subjective assessment of quality of services other than speech and video Series P.1500 For further det
6、ails, please refer to the list of ITU-T Recommendations. Rec. ITU-T P.382 (07/2016) i Recommendation ITU-T P.382 Technical requirements and test methods for multi-microphone wired headset or headphone interfaces of digital wireless terminals Summary Headset/headphone interfaces of diameter 3.5 mm an
7、d 2.5 mm have been widely used in digital mobile terminals during recent years. Nowadays, the consumer is free to choose either the headset/headphone originally provided by the terminal manufacturer or others that are offered separately. However, the quality of service/quality of experience (QoS/QoE
8、) perceived by users is influenced by both the electrical performance of the interface and the compatibility between the terminal and the connected headset/headphone. Recommendation ITU-T P.382 specifies critical physical and electroacoustical characteristics for the universal headset interface with
9、 more than four terminals and provides corresponding test methods. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T P.382 2016-07-29 12 11.1002/1000/12971 Keywords Connector, headphone, headset, interface, terminals. * To access the Recommendation, type the URL http:/handle.i
10、tu.int/ 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.382 (07/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of teleco
11、mmunications, 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 telecomm
12、unications 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 proc
13、edure 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 tele
14、communication 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 t
15、hese 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 RIGHTSIT
16、U draws 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 memb
17、ers or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not re
18、present the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2016 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.382 (07/
19、2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 3 5 General description . 3 6 Physical characteristics . 4 6.1 General rules . 4 6.2 Pin assignments 4 7 Electrical in
20、terface specification . 5 7.1 Communication mode 5 7.2 Multimedia playback 8 7.3 Multimedia record 9 8 Headset specification 12 8.1 Communication mode 12 8.2 Multimedia playback mode 13 8.3 Multimedia record mode 14 9 Function requirements for terminals with the universal headset interface . 16 Anne
21、x A Interpolation method for diffuse-field correction 17 Appendix I Audio connectivity for sockets with five contact points 18 I.1 Plug connector of diameter 2.5 mm with five poles . 18 I.2 Socket connector of diameter 2.5 mm with five contact points . 18 I.3 Plug connector of diameter 3.5 mm with f
22、ive poles . 18 I.4 Socket connector of diameter 3.5 mm with five contact points . 19 Appendix II Audio connectivity for sockets with six contact points 20 Appendix III Audio connectivity for sockets with less than five contact points 21 Appendix IV Other considerations . 22 Bibliography. 23 Rec. ITU
23、-T P.382 (07/2016) 1 Recommendation ITU-T P.382 Technical requirements and test methods for multi-microphone wired headset or headphone interfaces of digital wireless terminals 1 Scope This Recommendation specifies electrical requirements and test methods for a multi-microphone headset/headphone int
24、erface used in digital mobile terminals. The principle of this recommendation is to ensure adequate compatibility between the digital mobile terminal and the universal and multi-microphone wired analogue headset/headphone, and to have better user experience. The universality of the multi-microphone
25、headset/headphone interface will facilitate the separation of sales between digital mobile terminals and headsets/headphones. One of the benefits is that users are free to choose their favourite type of headset or headphone in the market. In the long run, it will reduce E-waste. Furthermore, the uni
26、versal interface can be used as the electric coupling design in hands-free systems and hearing aids for wider harmonization. To give specifications to manufacturers and encourage them to adopt the universal headset interface, the mechanical dimensions are shown in an Appendix for at least configurat
27、ions with five poles. This Recommendation applies to digital mobile terminals with physical analogue audio output/input interface that need to support headsets with 1 microphone. Other similar ICT equipment may also refer to this Recommendation. This Recommendation does not apply to terminals design
28、ed solely for digital headset/headphone usage. 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 time of publication, the editions indicated were valid. All Recommendati
29、ons 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. A list of the currently valid ITU-T Recommendations is regularly publis
30、hed. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T P.56 Recommendation ITU-T P.56 (2011), Objective measurement of active speech level. ITU-T P.57 Recommendation ITU-T P.57 (2011), Artificial ears. ITU-T P.58
31、 Recommendation ITU-T P.58 (2013), Head and torso simulator for telephonometry. ITU-T P.380 Recommendation ITU-T P.380 (2003), Electro-acoustic measurements on headsets. ITU-T P.381 Recommendation ITU-T P.381 (2014), Technical requirements and test methods for the universal wired headset or headphon
32、e interface of digital mobile terminals. ITU-T P.501 Recommendation ITU-T P.501 (2012), Test signals for use in telephonometry. 2 Rec. ITU-T P.382 (07/2016) ITU-T P.863 Recommendation ITU-T P.863 (2014), Perceptual objective listening quality assessment. IEC 60268-1 IEC 60268-1 (1985), Sound system
33、equipment Part1: General. IEC 61260-1 IEC 61260-1 (2014), Electroacoustics Octave-band and fractional-octave-band filters Part I: Specifications. EN 50332-1 EN 50332-1 (2013), Sound system equipment: Headphones and earphones associated with personal music players Maximum sound pressure level measure
34、ment methodology Part 1: General method for one package equipment. EN 50332-2 EN 50332-2 (2013), Sound system equipment: Headphones and earphones associated with personal music players Maximum sound pressure level measurement methodology Part 2: Matching of sets with headphones if either or both are
35、 offered separately, or are offered as one package equipment but with standardised connectors between the two allowing to combine components of different manufacturers or different design 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1
36、codec b-ITU-T G.701: Combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions of transmission in the same equipment. 3.1.2 composite source signal (CSS) b-ITU-T P.10: Signal composed in time by various signal elements. 3.1.3 eardrum reference p
37、oint (DRP) b-ITU-T P.10: A point located at the end of the ear canal, corresponding to the eardrum position. 3.1.4 earphone b-IEC 60268-7: Electroacoustic transducer by which acoustic oscillations are obtained from electric signals and intended to be closely coupled acoustically to the ear. 3.1.5 he
38、adset b-ITU-T P.10: A device which includes telephone receiver and transmitter which is typically secured to the head or the ear of the wearer. 3.1.6 mean opinion score listening-only quality objective (MOS-LQO) b-ITU-T P.800.1: The score is calculated by means of an objective model which aims at pr
39、edicting the quality for a listening-only test situation. Objective measurements made using the model given in ITU-T P.863 give results in terms of MOS-LQO. 3.1.7 mouth reference point (MRP) b-ITU-T P.10: Point 25 mm in front of and on the axis of the lip plane of the artificial mouth or a typical h
40、uman mouth (see Figure A.1 of ITU-T P.64). 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 artificial ear: A device which incorporates an acoustic coupler and a calibrated microphone for measuring sound pressure, and which has an overall acoustic imped
41、ance similar to that of the average adult ear over a given frequency band. NOTE This definition is based on that in b-ITU-T P.10. 3.2.3 head and torso simulator (HATS) for telephonometry: A manikin that extends downwards from the top of the head to the waist. It is designed to simulate the sound pic
42、k-up characteristics and Rec. ITU-T P.382 (07/2016) 3 the acoustic diffraction produced by the average adult, and to reproduce the acoustic field generated by the human mouth. NOTE This definition is based on that given in b-ITU-T P.10. 3.2.4 headphone: An object based on the assembly of one or two
43、earphones on a headband or chin-band, the use of which may be optional (e.g., with intra-concha earphones). NOTE This definition is based on that given in b-IEC 60268-7). 3.2.6 receive: The receiving direction of the signal transmission, usually from the measurement system to the device under test (
44、DUT). 3.2.7 send: The sending direction of the signal transmission, usually from the device under test (DUT) to the measurement system. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AH,R,dt Attenuation range in the receiving direction during double t
45、alk AH,S,dt Attenuation range in the sending direction during double talk DRP Drum Reference Point DUT Device Under Test ERP Ear Reference Point ESD Electrostatic Discharge FFT Fast Fourier Transform GND Ground HATS Head and Torso Simulator HP Headphone HTCLw Headset Terminal Coupling Loss weighted
46、L Left audio channel MIC Microphone MOS-LQO Mean Opinion Score Listening-only Quality Objective MRP Mouth Reference Point POI Point of Interconnection QoE Quality of Experience QoS Quality of Service R Right audio channel RMS Root Mean Square TCLw weighted Terminal Coupling Loss THD Total Harmonic D
47、istortion 5 General description Generally, if a headset or a headphone is used, the overall user experience during a call highly depends on both the terminal and the connected headset/headphone. Although the acoustic quality of the headset/headphone is usually the weak link, more consideration with
48、regard to the physical and electrical performance of the universal interface is needed. 4 Rec. ITU-T P.382 (07/2016) This Recommendation specifies new terminals to be implemented for compatibility with the universal concentric connector interface for successful interconnection of the digital mobile
49、terminal and the headset/headphone, including the plug connector and the socket connector. Normally, the socket connector is fixed inside the terminal, with the outside rim level with the surrounding shell of the terminal. Particularly, if the outside rim is lower than the surrounding shell, the dimension of the plug hand grip shall not influence the precise mating. 6 Physical characteristics 6.1 General rules Two types of concentric socket connectors are recommended for use: 2.5 mm and 3.5
