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.313 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2015) SERIES P: TERMINALS AND SUBJECTIVE AND OBJECTIVE ASSESSMENT METHODS Voice terminal characteristics Transmission characteristics for cordless and mobile digital
2、 terminals Recommendation ITU-T P.313 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
3、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.80 P.800 Audiovisual quality in multimedia services Series
4、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 assessment of streamed media Series P.1200 Telemeeting assessment Series P.1300 Statistical analysis, evaluation and reporting guidelines of qual
5、ity measurements 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.313 (06/2015) i Recommendation ITU-T P.313 Transmission characteristics f
6、or cordless and mobile digital terminals Summary Recommendation ITU-T P.313 provides audio performance requirements for portable digital cordless and mobile handsets, headsets and speakerphone sets. The requirements apply to narrowband systems (3.1 kHz) regardless of the coding algorithm used in the
7、 terminal. Associated test methods are also given. Requirements are specified for the major electro-acoustic performance parameters affecting audio quality, including sending and receiving levels, frequency responses, noise, sidetone, stability, echo path and delay. The requirements given in this Re
8、commendation should ensure satisfactory service quality in a high percentage of installations under normal conditions. Major changes over the previous version of this Recommendation (2007) are as follows: Specifications for wideband handset, wideband headset and wideband hands-free terminals have be
9、en added; The use of type 1 and type 3.2 artificial ears are removed from this Recommendation; For handset terminals the test of speech quality in the presence of ambient noise has been added; For most of the test point receive is now for the diffuse-field and no longer for ear reference point (ERP)
10、. Requirements for some tests such as frequency response, distortion and linearity have been updated. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T P.313 1999-09-30 12 11.1002/1000/4752 2.0 ITU-T P.313 2004-05-14 12 11.1002/1000/7301 3.0 ITU-T P.313 2007-03-16 12 11.1002/1
11、000/9064 4.0 ITU-T P.313 2015-06-29 12 11.1002/1000/12514 Keywords Cordless, electro-acoustic measurements, hands-free, mobile, performance specification, speakerphone, terminals, wireless. _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser,
12、 followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T P.313 (06/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication techn
13、ologies (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 telecommunications on a worldwide basis. The World Teleco
14、mmunication 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 procedure laid down in WTSA Resolution 1. In some are
15、as 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 telecommunication administration and a recognized ope
16、rating 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 these mandatory provisions are met. The words “sha
17、ll“ 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 draws attention to the possibility that the pra
18、ctice 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 or others outside of the Recommendation devel
19、opment 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 represent the latest information and are theref
20、ore 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.313 (06/2015) iii Table of Contents Page 1 Scope . 1
21、2 References . 1 3 Definitions 3 3.1 Terms defined elsewhere 3 3.2 Terms defined in this Recommendation . 3 4 Abbreviations and acronyms 3 5 Conventions 4 6 Test configuration . 4 6.1 Set-up for handset terminal 5 6.2 Set-up for headset . 5 6.3 Set-up for speakerphone sets 6 7 Test conditions 7 7.1
22、Test signal . 7 7.2 Test environment 8 7.3 Test set-up for simulated ambient noise in laboratory . 8 8 Narrowband handset technical requirements 9 8.1 Sending characteristics . 9 8.2 Receiving characteristics 13 8.3 Sidetone characteristics 19 8.4 Noise contrast and comfort noise . 20 8.5 Weighted t
23、erminal coupling loss (TCLw) 20 8.6 Stability loss . 21 8.7 Delay . 22 8.8 Speech clipping 23 8.9 Acoustic safety of telephone user . 23 8.10 Speech quality in presence of ambient noise 23 9 Narrowband headset technical requirements 25 9.1 Headset sending characteristics 25 9.2 Headset receiving cha
24、racteristics . 26 9.3 Sidetone characteristics 28 9.4 TCLw 29 9.5 Acoustic safety of telephone user . 29 9.6 Delay . 29 10 Narrowband speakerphone sets technical requirements . 30 10.1 Loudspeaker sending characteristics 30 10.2 Speakerphone set receiving characteristics 32 10.3 TCLw 36 iv Rec. ITU-
25、T P.313 (06/2015) Page 10.4 Switching characteristics 36 10.5 Double talk performance 37 10.6 Background noise transmission and comfort noise injection . 38 11 Wideband handset technical requirements . 38 11.1 Sending characteristics . 38 11.2 Receiving characteristics 42 11.3 Sidetone characteristi
26、cs 45 11.4 Noise contrast and comfort noise . 46 11.5 TCLw 46 11.6 Stability loss . 47 11.7 Delay . 48 11.8 Speech clipping 49 11.9 Acoustic safety of telephone user . 49 11.10 Speech quality in the presence of ambient noise 50 12 Wideband headset technical requirements 51 12.1 Headset sending chara
27、cteristics 51 12.2 Headset receiving characteristics . 53 12.3 Sidetone characteristics 55 12.4 TCLw 56 12.5 Acoustic safety of telephone user . 56 12.6 Delay . 57 13 Wideband speakerphone sets technical requirements . 57 13.1 Loudspeaker sending characteristics 57 13.2 Speakerphone set receiving ch
28、aracteristics 60 13.3 TCLw 63 13.4 Switching characteristics 63 13.5 Double talk performance 64 13.6 Background noise transmission and comfort noise injection . 64 Rec. ITU-T P.313 (06/2015) 1 Recommendation ITU-T P.313 Transmission characteristics for cordless and mobile digital terminals 1 Scope T
29、his Recommendation deals with electro-acoustic performance parameters of portable digital cordless and mobile terminals. The requirements given below should ensure satisfactory voice service in a high percentage of installations under normal conditions, but other factors impacting the performance, s
30、uch as the radio link, are not included. This Recommendation could be used as the baseline text of requirements and test methods for mobile or cordless telephony, e.g., when developing new telephony systems. It is not intended to override other acoustic specifications that have been developed for sp
31、ecific telephony systems. This Recommendation includes specifications for handsets, headsets and speakerphone sets of mobile terminals. These specifications may be applicable to digital cordless handsets, headsets and speakerphone sets. The requirements contained in this Recommendation apply only to
32、 narrowband systems (3.1 kHz) and wideband systems (7 kHz) regardless of the coding algorithm used. Specifications for speakerphone sets are recommended for handheld terminals and desktops. Specifications for car mounted hands-free terminals will be included in a separate Recommendation. Requirement
33、s are given for handsets, headsets and speakerphone sets in conjunction with a 0 dBr 4-wire reference (see Figure 1) base station having an appropriate air interface, and are specified irrespective of the particular technology and air interface. Figure 1 Reference configuration 2 References The foll
34、owing 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 Recommendations and other references are subject to revision; users of this Reco
35、mmendation 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 published. The reference to a document within this Recommendation does not
36、 give it, as a stand-alone document, the status of a Recommendation. ITU-T G.114 Recommendation ITU-T G.114 (2003), One-way transmission time. ITU-T G.122 Recommendation ITU-T G.122 (1993), Influence of national systems on stability and talker echo in international connections. ITU-T G.131 Recommend
37、ation ITU-T G.131 (2003), Talker echo and its control. ITU-T G.168 Recommendation ITU-T G.168 (2014), Digital network echo cancellers. ITU-T O.41 Recommendation ITU-T O.41 (1994), Psophometer for use on telephone-type circuits. 2 Rec. ITU-T P.313 (06/2015) ITU-T P.10 Recommendation ITU-T P.10/G.100
38、(2006), Vocabulary for performance and quality of service. ITU-T P.50 Recommendation ITU-T P.50 (1999), Artificial voices. ITU-T P.51 Recommendation ITU-T P.51 (1996), Artificial mouth. ITU-T P.57 Recommendation ITU-T P.57 (2011, Artificial ears. ITU-T P.58 Recommendation ITU-T P.58 (2013), Head and
39、 torso simulator for telephonometry. ITU-T P.64 Recommendation ITU-T P.64 (2007), Determination of sensitivity/frequency characteristics of local telephone systems. ITU-T P.79 Recommendation ITU-T P.79 (2007), Calculation of loudness ratings for telephone sets. ITU-T P.310 Recommendation ITU-T P.310
40、 (2009), Transmission characteristics for narrow-band digital handset and headset telephones. ITU-T P.330 Recommendation ITU-T P.330 (2003), Speech processing devices for acoustic enhancement. ITU-T P.340 Recommendation ITU-T P.340 (2000), Transmission characteristics and speech quality parameters o
41、f hands-free terminals. ITU-T P.342 Recommendation ITU-T P.342 (2009), Transmission characteristics for narrow-band digital loudspeaking and hands-free telephony terminals. ITU-T P.360 Recommendation ITU-T P.360 (2006), Efficiency of devices for preventing the occurrence of excessive acoustic pressu
42、re by telephone receivers and assessment of daily noise exposure of telephone users. ITU-T P.380 Recommendation ITU-T P.380 (2003), Electro-acoustic measurements on headsets. ITU-T P.501 Recommendation ITU-T P.501 (2012), Test signals for use in telephonometry. ITU-T P.502 Recommendation ITU-T P.502
43、 (2000), Objective test methods for speech communication systems using complex test signals. ITU-T P.581 Recommendation ITU-T P.581 (2014), Use of head and torso simulator for hands-free terminal testing. ITU-T P.832 Recommendation ITU-T P.832 (2000), Subjective performance evaluation of hands-free
44、terminals. IEC 61260 IEC 61260:1995, Electroacoustics Octave-band and fractional octave-band filters. ETSI ES 103 106 ETSI TS 103 106 V1.2.1 (2013-03), Speech Speech quality performance in the presence of background noise: Background noise transmission for mobile terminals-objective test methods. ET
45、SI ES 202 396-1 ETSI ES 202 396-1 V1.4.1 (2012-10), Speech quality performance in the presence of background noise; Part 1: Background noise simulation technique and background noise database. NOTE The latest versions of the annexes to these Recommendations shall apply. Rec. ITU-T P.313 (06/2015) 3
46、3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 hands-free reference point (HFRP) ITU-T P.10: (see ITU-T P.340, ITU-T P.341 and ITU-T P.342): A point located on the axis of the artificial mouth, at 50 cm from the outer plane of the lip
47、ring, where the level calibration is made, under free-field conditions. It corresponds to the measurement point 11, as defined in ITU-T P.51. 3.1.2 hands-free terminal ITU-T P.10: A telephone set that does not require the use of hands during the communications session; examples are headset, speakerp
48、hone and group-audio terminal. 3.1.3 handset ITU-T P.10: A device which includes telephone receiver and transmitter which is typically coupled to the ear by hand. 3.1.4 handset telephone ITU-T P.10: A telephone set equipped with a handset. 3.1.5 head and torso simulator (HATS) ITU-T P.10: (see ITU-T
49、 P.58): Manikin extending downward from the top of the head to the waist, designed to simulate the sound pick-up characteristics and the acoustic diffraction produced by a median human adult and to reproduce the acoustic field generated by the human mouth. 3.1.6 headset 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. 3.1.7 recommended test position (RTP) I
