1、 ETSI ES 202 738 V1.5.1 (2017-01) Speech and multimedia Transmission Quality (STQ); Transmission requirements for narrowband VoIP loudspeaking and handsfree terminals from a QoS perspective as perceived by the user ETSI STANDARD ETSI ETSI ES 202 738 V1.5.1 (2017-01) 2 Reference RES/STQ-243 Keywords
2、handsfree, loudspeaking, narrowband, quality, speech, terminal, VoIP ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 780
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9、ntents Intellectual Property Rights 5g3Foreword . 5g3Modal verbs terminology 5g3Introduction 5g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 7g33 Definitions and abbreviations . 8g33.1 Definitions 8g33.2 Abbreviations . 9g34 General considerations . 10g34.1 Def
10、ault Coding Algorithm 10g34.2 End-to-end considerations 10g35 Test equipment . 10g35.1 IP half channel measurement adaptor . 10g35.2 Environmental conditions for tests . 10g35.3 Accuracy of measurements and test signal generation . 11g35.4 Network impairment simulation . 11g35.5 Acoustic environment
11、 . 12g35.6 Influence of terminal delay on measurements 12g36 Requirements and associated measurement methodologies . 13g36.1 Notes 13g36.2 Test setup 13g36.2.1 General 13g36.2.2 Setup for terminal . 14g36.2.2.1 Hands-free measurements . 14g36.2.2.2 Measurements in loudspeaking mode . 18g36.2.3 Test
12、signal levels . 18g36.2.3.1 Send. 18g36.2.3.2 Receive 19g36.2.4 Setup of background noise simulation 19g36.3 Coding independent parameters . 20g36.3.1 Send frequency response 20g36.3.2 Send Loudness Rating (SLR) 21g36.3.3 Mic mute . 21g36.3.4 Send distortion 21g36.3.5 Out-of-band signals in send dir
13、ection . 22g36.3.6 Send noise . 23g36.3.7 Terminal Coupling Loss weighted (TCLw) 23g36.3.8 Stability loss 23g36.3.9 Receive frequency response 24g36.3.10 Receive Loudness Rating (RLR) 26g36.3.11 Receive Distortion 27g36.3.12 Out-of-band signals in receive direction . 28g36.3.13 Receive noise 28g36.3
14、.14 Double talk performance 29g36.3.14.1 General 29g36.3.14.2 Attenuation range in send direction during double talk AH,S,dt29g36.3.14.3 Attenuation range in receive direction during double talk AH,R,dt30g36.3.14.4 Detection of echo components during double talk 31g36.3.14.5 Minimum activation level
15、 and sensitivity of double talk detection . 32g3ETSI ETSI ES 202 738 V1.5.1 (2017-01) 4 6.3.15 Switching characteristics 32g36.3.15.1 Note . 32g36.3.15.2 Activation in send direction 32g36.3.15.3 Silence suppression and comfort noise generation 33g36.3.16 Background noise performance 33g36.3.16.1 Pe
16、rformance in send direction in the presence of background noise . 33g36.3.16.2 Speech quality in the presence of background noise . 34g36.3.16.3 Quality of background noise transmission (with far end speech) 35g36.3.17 Quality of echo cancellation . 35g36.3.17.1 Temporal echo effects . 35g36.3.17.2
17、Spectral echo attenuation 36g36.3.17.3 Occurrence of artefacts . 37g36.3.17.4 Variable echo path. 37g36.3.18 Variant impairments; network dependant . 38g36.3.18.1 Clock accuracy send 38g36.3.18.2 Clock accuracy receive . 38g36.3.18.3 Send delay variation 38g36.3.19 Send and receive delay - round tri
18、p delay . 39g36.4 Codec specific requirements. 41g36.4.1 Objective listening speech quality MOS-LQO in send direction 41g36.4.2 Objective listening quality MOS-LQO in receive direction . 42g36.4.3 Quality of jitter buffer adjustment 43g3Annex A (informative): Processing delays in VoIP terminals 46g3
19、Annex B (informative): Bibliography . 49g3History 50g3ETSI ETSI ES 202 738 V1.5.1 (2017-01) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available
20、 for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (h
21、ttps:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, es
22、sential to the present document. Foreword This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission Quality (STQ). Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“
23、 and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. Introduction Traditionally, the analogue and digital telephones w
24、ere interfacing switched-circuit 64 kbit/s PCM networks. With the fast growth of IP networks, terminals directly interfacing packet-switched networks (VoIP) are being rapidly introduced. Such IP network edge devices may include specifically designed IP phones, soft phones or other devices connected
25、to the IP based networks and providing telephony service. Since the IP networks will be in many cases interworking with the traditional PSTN and private networks, many of the basic transmission requirements have to be harmonised with specifications for traditional digital terminals. However, due to
26、the unique characteristics of the IP networks including packet loss, delay, etc. new performance specification, as well as appropriate measuring methods, will have to be developed. Terminals are getting increasingly complex. Advanced signal processing is used to address the IP specific issues. Also,
27、 the VoIP terminals may use other than 64 kbit/s PCM (Recommendation ITU-T G.711 7) speech algorithms. The advanced signal processing of terminals is targeted to speech signals. Therefore, wherever possible speech signals are used for testing in order to achieve mostly realistic test conditions and
28、meaningful results. The present document provides speech transmission performance requirements for narrowband VoIP loudspeaking and hands-free terminals. NOTE: Requirement limits are given in tables, the associated curve when provided is given for illustration. ETSI ETSI ES 202 738 V1.5.1 (2017-01)
29、6 1 Scope The present document will provide speech transmission performance requirements for narrowband VoIP loudspeaking and hands-free terminals; it addresses all types of IP based terminals, including wireless, softphones and group audio terminals. In contrast to other standards which define mini
30、mum performance requirements it is the intention of the present document to specify terminal equipment requirements which enable manufacturers and service providers to enable good quality end-to-end speech performance as perceived by the user. In addition to basic testing procedures, the present doc
31、ument describes advanced testing procedures taking into account further quality parameters as perceived by the user. NOTE: The present document does not concern headset terminals. 2 References 2.1 Normative references References are either specific (identified by date of publication and/or edition n
32、umber or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location
33、 might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. 1 ETSI I-ETS 300
34、245-3: “Integrated Services Digital Network (ISDN); Technical characteristics of telephony terminals; Part 3: Pulse Code Modulation (PCM) A-law, loudspeaking and handsfree telephony“. 2 ETSI EN 300 726: “Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full Rate (EFR) speech tra
35、nscoding (GSM 06.60)“. 3 ETSI TS 126 171: “Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; General description (3GPP TS 26.171)“. 4 Recommend
36、ation ITU-T G.108: “Application of the E-model: A planning guide“. 5 Recommendation ITU-T G.109: “Definition of categories of speech transmission quality“. 6 Recommendation ITU-T G.122: “Influence of national systems on stability and talker echo in international connections“. 7 Recommendation ITU-T
37、G.711: “Pulse code modulation (PCM) of voice frequencies“. 8 Recommendation ITU-T G.723.1: “Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s“. 9 Recommendation ITU-T G.726: “40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)“. 10 Recommen
38、dation ITU-T G.729: “Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP)“. ETSI ETSI ES 202 738 V1.5.1 (2017-01) 7 11 Recommendation ITU-T G.729.1: “G.729-based embedded variable bit-rate coder: An 8-32 kbit/s scalable wideband coder bitstream i
39、nteroperable with G.729“. 12 Recommendation ITU-T O.41: “Psophometer for use on telephone-type circuits“. 13 Recommendation ITU-T P.50: “Artificial voices“. 14 Recommendation ITU-T P.56: “Objective measurement of active speech level“. 15 Recommendation ITU-T P.58: “Head and torso simulator for telep
40、honometry“. 16 Recommendation ITU-T P.79: “Calculation of loudness ratings for telephone sets“. 17 Recommendation ITU-T P.310: “Transmission characteristics for narrow-band digital handset and headset telephones“. 18 Recommendation ITU-T P.340: “Transmission characteristics and speech quality parame
41、ters of hands-free terminals“. 19 Recommendation ITU-T P.342: “Transmission characteristics for narrow-band digital loudspeaking and hands-free telephony terminals“. 20 Recommendation ITU-T P.501: “Test signals for use in telephonometry“. 21 Recommendation ITU-T P.502: “Objective test methods for sp
42、eech communication systems using complex test signals“. 22 Recommendation ITU-T P.581: “Use of head and torso simulator for hands-free and handset terminal testing“. 23 IEC 61260-1: “Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications“. 24 Recommendation ITU-T
43、P.800.1: “Mean Opinion Score (MOS) terminology“. 25 ETSI ES 202 396-1: “Speech and multimedia Transmission Quality (STQ); Speech quality performance in the presence of background noise; Part 1: Background noise simulation technique and background noise database“. 26 Recommendation ITU-T P.863.1: “Ap
44、plication guide for Recommendation ITU-T P.863“. 27 Recommendation ITU-T P.863: “Perceptual objective listening quality assessment“. 28 ETSI ES 202 737: “Speech and multimedia Transmission Quality (STQ); Transmission requirements for narrowband VoIP terminals (handset and headset) from a QoS perspec
45、tive as perceived by the user“. 29 Recommendation ITU-T P.1010: “Fundamental voice transmission objectives for VoIP terminals and gateways“. 30 IETF RFC 3550: “RTP: A Transport Protocol for Real-Time Applications“. 2.2 Informative references References are either specific (identified by date of publ
46、ication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at t
47、he time of publication ETSI cannot guarantee their long term validity. ETSI ETSI ES 202 738 V1.5.1 (2017-01) 8 The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 ETSI EG 202 425: “Spe
48、ech Processing, Transmission and Quality Aspects (STQ); Definition and implementation of VoIP reference point“. i.2 ETSI EG 202 396-3: “Speech and multimedia Transmission Quality (STQ); Speech Quality performance in the presence of background noise; Part 3: Background noise transmission - Objective
49、test methods“. i.3 NIST Net. NOTE: Available at https:/www-x.antd.nist.gov/itg/nistnet/. i.4 Netem. NOTE: Available at http:/www.linuxfoundation.org/en/Net:Netem. i.5 ETSI EG 201 377-1: “Speech and multimedia Transmission Quality (STQ); Specification and measurement of speech transmission quality; Part 1: Introduction to objective comparison measurement methods for one-way speech quality across networks“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the follo
