1、 ETSI ES 201 377-2 V1.4.1 (2009-12)ETSI Standard Speech and multimedia Transmission Quality (STQ);Specification and measurement ofspeech transmission quality;Part 2: Mouth-to-ear speech transmissionquality including terminalsETSI ETSI ES 201 377-2 V1.4.1 (2009-12)2Reference RES/STQ-00105-2 Keywords
2、network, QoS, quality, speech, terminal, testing, transmission 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 7803/88 I
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6、o part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2009. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo ar
7、e Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. LTE is a Trade Mark of ETSI currently being registered for the benefit of its Members and of the 3GPP Organizational Part
8、ners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI ES 201 377-2 V1.4.1 (2009-12)3Contents Intellectual Property Rights 5g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g32.1 Normative references . 7g32.2 Informative references 9g33 Definitions
9、and abbreviations . 9g33.1 Definitions 9g33.2 Abbreviations . 11g34 General considerations for end-to-end speech quality evaluations 12g35 Test configurations . 16g35.1 Test setup for terminals 16g35.1.1 Setup for handset terminals . 17g35.1.2 Setup for headset terminals . 17g35.1.3 Setup for hands-
10、free type terminals and loudspeaking terminals 18g35.1.4 Position and calibration of HATS . 18g35.2 Setup of the electrical interfaces . 18g35.3 Test signals . 19g35.4 Accuracy of test equipment 19g36 Test conditions . 20g36.1 Acoustic environment . 20g36.2 Network conditions, general . 20g36.2.1 Ne
11、twork conditions, PSTN . 21g36.2.2 Network conditions, packet based transmission . 21g36.2.3 Network conditions, GSM mobile and 3G mobile 22g36.2.3.1 Speech levels . 25g36.2.3.2 Echo control 25g36.2.3.3 Radio network and radio network features 26g37 Measurement of “standard“ parameters 28g37.1 Sendi
12、ng frequency response . 29g37.2 Receiving frequency response 29g37.3 Overall frequency response 29g37.4 Sending (and connection) loudness rating 30g37.5 Receiving (and connection) loudness rating . 30g37.6 Overall loudness rating . 31g37.7 Sidetone masking rating . 32g37.8 Listener sidetone 32g37.9
13、Measurement and calculation of the value of the D-factor (DelSM) 33g37.10 Delay 34g37.10.1 Delay in sending direction 34g37.10.2 Delay in receiving direction 34g37.10.3 Overall delay . 35g37.11 Terminal coupling loss . 35g37.12 Talker echo loudness rating 36g37.13 Weighted echo path loss . 37g37.14
14、Distortion 37g37.14.1 Distortion in sending . 37g37.14.2 Distortion in receiving 38g37.14.3 Overall distortion 39g37.15 Sensitivity against out-of-band signals in sending . 40g3ETSI ETSI ES 201 377-2 V1.4.1 (2009-12)47.16 Spurious out-of-band signals in receiving 41g38 Advanced measurement procedure
15、s, taking into account the conversational situation 42g38.1 Measurement setup for objective tests 43g38.2 Practical realization of test signals . 43g38.3 Quality of background noise transmission . 43g38.3.1 Test setup for background noise transmission tests 44g38.3.2 Background noise transmission wi
16、th far end speech 44g38.3.3 Background noise transmission with near end speech 45g38.3.4 Speech transmission quality with near end background noise 46g38.4 Double talk performance 47g38.5 Switching characteristics 48g38.6 Level adjustments by companding or AGC . 51g38.7 Additional echo disturbances
17、. 52g38.8 Speech sound quality 52g3Annex A (informative): Bibliography . 54g3History 55g3ETSI ETSI ES 201 377-2 V1.4.1 (2009-12)5Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential
18、IPRs, if any, is publicly available 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
19、available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). 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 We
20、b server) which are, or may be, or may become, essential to the present document. Foreword This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission Quality (STQ). The present document provides technical requirements for assessing the conversational spe
21、ech quality performance parameters from mouth-to-ear independent of the technology used. The present document is part 2 of a multi-part deliverable covering the specification and measurement of speech transmission quality, as identified below: EG 202 377-1: “Introduction to objective comparison meas
22、urement methods for one-way speech quality across networks“; ES 202 377-2: “Mouth-to-ear speech transmission quality including terminals“; EG 202 377-3: “Non-intrusive objective measurement methods applicable to networks and links with classes of services“. Introduction Various standards within ETSI
23、, ITU, TIA and other standardization organizations describe performance requirements for different types of terminals, networks and network components. In each standard emphasis is given typically only to a part of the overall connection. The speech quality perceived by the user however is influence
24、d by any component in the overall connection. In modern complex network and end-to-end (mouth-to-ear) configurations there is no guarantee for a sufficient overall performance if only the individual components conform to their relevant standards. Furthermore many of the existing testing specificatio
25、ns still assume a linear and time invariant behaviour of the components which due to complex signal processing in most of the modern communication devices can no longer be expected. Only a few standards exist which describe test procedures and requirements for the interaction of different network co
26、mponents with the different types of terminals. The present document addresses the mouth-to-ear speech quality taking into account all conversational aspects. An overview about different network/terminal configurations and their specific impact on speech quality is given. The present document descri
27、bes testing procedures and setups for different configurations. ETSI ETSI ES 201 377-2 V1.4.1 (2009-12)61 Scope The present document addresses mouth-to-ear (i.e. end-to-end speech quality for 3,1 kHz telephony). It both: a) summarizes and gives guidance about the main factors that affect speech qual
28、ity in end-to-end scenarios; and b) specifies test methods for end-to-end speech quality testing. The test methods can be used both for the complete transmission from mouth-to-ear and also for testing individual sections of a connection. The end-end (mouth-to-ear) test methods specified in the prese
29、nt document are independent of the technology used in the network and the terminals. However when practical considerations make it necessary to test at electrical interfaces within or between equipments the present document explains how to handle the most common current technologies. The present doc
30、ument is designed to be used by: terminal and terminal component (e.g. soundcard) developers who wish to evaluate the end-to-end performance of networks and their terminals (or components); or network designers who wish to evaluate the end-to-end performance of their networks with typical terminals.
31、 And therefore it gives advice on how networks and representative terminals (respectively) can be selected or simulated for use in the end-to-end tests. The test methods described allow the evaluation of all conversational situations such as single talk and double talk by means of objective procedur
32、es. The present document takes account of: a) all types of terminals, including handsets, headsets and dedicated hands-free arrangements such as are provided with some mobile terminals and PC based terminals; b) both circuit switched and packet based networks, including IP and ATM. The present docum
33、ent is not generally suitable for wideband telephony or other forms of wideband communication although the parametric approach and the measurement procedures for some of the parameters described in the present document are applicable for wideband communication as well. 2 References References are ei
34、ther specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. Non-specific reference may be made only to a complete document or a part thereof and only in the following cases: - if it is accepte
35、d that it will be possible to use all future changes of the referenced document for the purposes of the referring document; - for informative references. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE
36、: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. ETSI ETSI ES 201 377-2 V1.4.1 (2009-12)72.1 Normative references The following referenced documents are indispensable for the application of the present document. For
37、dated references, only the edition cited applies. For non-specific references, the latest edition of the referenced document (including any amendments) applies. 1 ITU-T Recommendation G.821: “Error performance of an international digital connection operating at a bit rate below the primary rate and
38、forming part of an Integrated Services Digital Network“. 2 Gierlich, H.W.; Kettler, F., Diedrich, E.: “Speech Quality Evaluation of Hands-Free Telephones During Double Talk: New Evaluation Methodologies“; EUSIPCO 1998, Proceedings, Vol. II. 3 Gierlich, H.W. (December 1996): “The auditory perceived q
39、uality of hands-free telephones: Auditory judgements, instrumental measurements and their relationship“, Speech Communication 20, pp. 241-254. 4 IEC 61260: “Electroacoustics - Octave-band and fractional-octave-band filters“. 5 IEC 61672 (all parts): “Electroacoustics - Sound level meters“. 6 ISO 3 (
40、1973): “Preferred numbers - Series of preferred numbers“. 7 ITU-T Recommendation G.107: “The E-model, a computational model for use in transmission planning“. 8 ITU-T Recommendation G.111: “Loudness ratings (LRs) in an international connection“. 9 ITU-T Recommendation G.122: “Influence of national s
41、ystems on stability and talker echo in international connections“. 10 ITU-T Recommendation G.131: “Talker echo and its control“. 11 ITU-T Recommendation G.168: “Digital network echo cancellers“. 12 ITU-T Recommendation G.712: “Transmission performance characteristics of pulse code modulation channel
42、s“. 13 ITU-T Recommendation O.131: “Quantizing distortion measuring equipment using a pseudo-random noise test signal“. 14 ITU-T Recommendation O.132: “Quantizing distortion measuring equipment using a sinusoidal test signal“. 15 ITU-T Recommendation P.340: “Transmission characteristics and speech q
43、uality parameters of hands-free terminals“. 16 ITU-T Recommendation P.380: “Electro-acoustic measurements on headsets“. 17 ITU-T Recommendation P.50: “Artificial voices“. 18 ITU-T Recommendation P.501: “Test signals for use in telephonometry“. 19 ITU-T Recommendation P.502: “Objective test methods f
44、or speech communication systems using complex test signals“. 20 ITU-T Recommendation P.51: “Artificial mouth“. 21 ITU-T Recommendation P.57: “Artificial ears“. 22 ITU-T Recommendation P.58: “Head and torso simulator for telephonometry“. 23 ITU-T Recommendation P.581: “Use of Head and Torso Simulator
45、 (HATS) for hands-free terminal testing“. ETSI ETSI ES 201 377-2 V1.4.1 (2009-12)824 ITU-T Recommendation P.64: “Determination of sensitivity/frequency characteristics of local telephone systems“. 25 ITU-T Recommendation P.79 and Corrigendum 2 (2001): “Calculation of loudness ratings for telephone s
46、ets“. 26 ITU-T Recommendation P.800: “Methods for subjective determination of transmission quality“. 27 ITU-T Recommendation P.810: “Modulated noise reference unit (MNRU)“. 28 ITU-T Recommendation P.830: “Subjective performance assessment of telephone-band and wideband digital codecs“. 29 ITU-T Reco
47、mmendation P.831: “Subjective performance evaluation of network echo cancellers“. 30 ITU-T Recommendation P.832: “Subjective performance evaluation of hands-free terminals“. 31 ITU-T Recommendation P.862: “Perceptual evaluation of speech quality (PESQ), an objective method for end-to-end speech qual
48、ity assessment of narrow-band telephone networks and speech codecs“. 32 ITU-T Recommendation Y.1541: “Network performance objectives for IP-based services“. 33 ITU-T COM12-42 (Federal Republic of Germany, January 1998): “Listening only test results for hands-free telephones and their dependence upon
49、 room surroundings“. 34 TIA/EIA 810-A: “Telecommunications - Telephone Terminal Equipment-Transmission Requirements for Narrowband“. 35 ITU-T Recommendation P.59: “Artificial conversational speech“. 36 ITU-T Recommendation G.711: “Pulse code modulation (PCM) of voice frequencies“. 37 ETSI TS 100 961: “Digital cellular telecommunications system (Phase 2+) (GSM); Full rate speech; Transcoding (GSM 06.10 Release 1998)“. 38 ETSI EN 300 969: “Digital cellular telecommunications system (Phase 2+) (G
