1、 ETSI ES 202 738 V1.4.1 (2015-03) 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 V1.4.1 (2015-03) 2 Reference RES/STQ-203 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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7、DF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2015. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI
8、 registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI ES 202 738 V1.4.1 (2015-03) 3 Contents Int
9、ellectual Property Rights 6g3Foreword . 6g3Modal verbs terminology 6g3Introduction 6g31 Scope 7g32 References 7g32.1 Normative references . 7g32.2 Informative references 8g33 Definitions and abbreviations . 9g33.1 Definitions 9g33.2 Abbreviations . 10g34 General considerations . 11g34.1 Default Codi
10、ng Algorithm 11g34.2 End-to-end considerations 11g34.3 Parameters to be investigated . 11g34.3.1 Basic parameters . 11g34.3.2 Further Parameters with respect to Speech Processing Devices . 11g35 Test equipment . 12g35.1 IP half channel measurement adaptor . 12g35.2 Environmental conditions for tests
11、 . 12g35.3 Accuracy of measurements and test signal generation . 12g35.4 Network impairment simulation . 13g35.5 Acoustic environment . 14g35.6 Influence of terminal delay on measurements 14g36 Test setup 14g36.1 Setup for terminal . 15g36.1.1 Hands-free measurements . 15g36.1.2 Measurements in loud
12、speaking mode . 20g36.2 Test signal levels 20g36.2.1 Send 20g36.2.2 Receive . 21g36.3 Setup of background noise simulation 21g37 Measurements and Requirements for Basic Parameters 22g37.1 Coding independent parameters . 22g37.1.1 Send Frequency Response 22g37.1.1.1 Requirement 22g37.1.1.2 Measuremen
13、t method 23g37.1.2 Send Loudness Rating 24g37.1.2.1 Requirement 24g37.1.2.2 Measurement method 24g37.1.3 Send Distortion . 24g37.1.3.1 Requirement 24g37.1.3.2 Measurement method 24g37.1.4 Out-of-band Signals in Send direction 24g37.1.4.1 Requirement 24g37.1.4.2 Measurement method 25g37.1.5 Send Nois
14、e 25g37.1.5.1 Requirement 25g37.1.5.2 Measurement method 25g37.1.6 Receive Frequency Response . 26g37.1.6.1 Requirement 26g37.1.6.2 Measurement method 27g3ETSI ETSI ES 202 738 V1.4.1 (2015-03) 4 7.1.7 Receive Loudness Rating 28g37.1.7.1 Requirement 28g37.1.7.2 Measurement method 28g37.1.8 Receive Di
15、stortion 28g37.1.8.1 Requirement 28g37.1.8.2 Measurement method 29g37.1.9 Out-of-band Signals in Receive Direction 29g37.1.9.1 Requirement 29g37.1.9.2 Measurement Method 30g37.1.10 Receive Noise . 30g37.1.10.1 Requirement 30g37.1.10.2 Measurement method 30g37.1.11 Terminal Coupling Loss . 30g37.1.11
16、.1 Requirement 30g37.1.11.2 Measurement method 30g37.1.12 Stability Loss 31g37.1.12.1 Requirement 31g37.1.12.2 Measurement method 31g37.2 Codec Specific Requirements. 31g37.2.1 Send Delay 31g37.2.1.1 Requirement 32g37.2.1.2 Measurement Method 32g37.2.2 Receive delay 33g37.2.2.1 Requirement 33g37.2.2
17、.2 Measurement Method 34g38 Measurements and Requirements for Parameters with respect to Speech Processing Devices . 34g38.1 Objective Listening Speech Quality MOS-LQO in Send direction 34g38.2 Objective Listening Quality MOS-LQO in Receive direction . 34g38.3 Minimum activation level and sensitivit
18、y in Receive direction . 34g38.4 Automatic Level Control in Receive 34g38.5 Double Talk Performance. 34g38.5.1 Attenuation Range in Send Direction during Double Talk AH,S,dt. 35g38.5.1.1 Requirement 35g38.5.1.2 Measurement Method 35g38.5.2 Attenuation Range in Receive Direction during Double Talk AH
19、,R,dt36g38.5.2.1 Requirement 36g38.5.2.2 Measurement Method 36g38.5.3 Detection of Echo Components during Double Talk 36g38.5.3.1 Requirement 36g38.5.3.2 Measurement Method 36g38.5.4 Minimum activation level and sensitivity of double talk detection 38g38.5.5 Switching characteristics 38g38.5.5.1 Act
20、ivation in Send Direction . 38g38.5.5.1.1 Requirements. 38g38.5.5.1.2 Measurement Method 38g38.5.5.2 Silence Suppression and Comfort Noise Generation 38g38.5.5.3 Performance in Send direction in the presence of background noise 39g38.5.5.3.1 Requirement 39g38.5.5.3.2 Measurement Method 39g38.5.5.4 S
21、peech Quality in the Presence of Background Noise 39g38.5.5.4.1 Requirement 39g38.5.5.4.2 Measurement Method 40g38.5.5.5 Quality of Background Noise Transmission (with Far End Speech) 40g38.5.5.5.1 Requirements . 40g38.5.5.5.2 Measurement Method 40g38.5.6 Quality of echo cancellation . 41g38.5.6.1 T
22、emporal echo effects . 41g38.5.6.1.1 Requirement 41g38.5.6.1.2 Measurement Method 41g38.5.6.2 Spectral Echo Attenuation . 41g3ETSI ETSI ES 202 738 V1.4.1 (2015-03) 5 8.5.6.2.1 Requirement 41g38.5.6.2.2 Measurement Method 42g38.5.6.3 Occurrence of Artifacts . 42g38.5.7 Variant Impairments; Network de
23、pendant 42g38.5.7.1 Send and receive delay - Round trip delay 42g38.5.7.2 Quality of Jitter buffer adjustment 44g3Annex A (informative): Processing delays in VoIP terminals 46g3Annex B (informative): Bibliography . 49g3History 50g3ETSI ETSI ES 202 738 V1.4.1 (2015-03) 6 Intellectual Property Rights
24、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 for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or
25、 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 (http:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI
26、. 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, essential to the present document. Foreword This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and mu
27、ltimedia Transmission Quality (STQ). Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
28、 provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. Introduction Traditionally, the analogue and digital telephones were interfacing switched-circuit 64 kbit/s PCM networks. With the fast growth of IP networks, terminals directly interfacing
29、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 to the IP based networks and providing telephony service. Since the IP networks will be in many cases interworking with the t
30、raditional PSTN and private networks, many of the basic transmission requirements have to be harmonized with specifications for traditional digital terminals. However, due to the unique characteristics of the IP networks including packet loss, delay, etc. new performance specification, as well as ap
31、propriate measuring methods, will have to be developed. Terminals are getting increasingly complex. Advanced signal processing is used to address the IP specific issues. Also, the VoIP terminals may use other than 64 kbit/s PCM (Recommendation ITU-T G.711 7) speech algorithms. The advanced signal pr
32、ocessing 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 meaningful results. The present document provides speech transmission performance requirements for narrowband VoIP loudspeaki
33、ng 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 V1.4.1 (2015-03) 7 1 Scope The present document will provide speech transmission performance requirements for narrowband VoIP loudspeaking and
34、 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 minimum performance requirements it is the intention of the present document to specify terminal equipment requirements which ena
35、ble 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 document describes advanced testing procedures taking into account further quality parameters as perceived by the user. NOTE: Th
36、e 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 number or version number) or non-specific. For specific references, only the cited version applies. For non-specific reference
37、s, the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time
38、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 300 245-3: “Integrated Services Digital Network (ISDN); Technical characteristics of telephony terminals; Part 3: Pulse Code Modul
39、ation (PCM) A-law, loudspeaking and handsfree telephony“. 2 ETSI TS 126 171: “Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); AMR speech codec, wideband; General description (3GPP TS 26.171 version 6.0.0 Release 6)“. 3 Recommendation ITU-T G.
40、108: “Application of the E-model: A planning guide“. 4 Recommendation ITU-T G.109: “Definition of categories of speech transmission quality“. 5 Recommendation ITU-T G.122: “Influence of national systems on stability and talker echo in international connections“. 6 Void. 7 Recommendation ITU-T G.711:
41、 “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.729: “Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear predicti
42、on (CS-ACELP)“. 10 Recommendation ITU-T G.1020: “Performance parameter definitions for quality of speech and other voiceband applications utilizing IP networks“. 11 Recommendation ITU-T O.41: “Psophometer for use on telephone-type circuits“. 12 Recommendation ITU-T P.50: “Artificial voices“. ETSI ET
43、SI ES 202 738 V1.4.1 (2015-03) 8 13 Recommendation ITU-T P.56: “Objective measurement of active speech level“. 14 Recommendation ITU-T P.58: “Head and torso simulator for telephonometry“. 15 Recommendation ITU-T P.79: “Calculation of loudness ratings for telephone sets“. 16 Recommendation ITU-T P.31
44、0: “Transmission characteristics for narrow-band digital handset and headset telephones“. 17 Recommendation ITU-T P.340: “Transmission characteristics and speech quality parameters of hands-free terminals“. 18 Recommendation ITU-T P.342: “Transmission characteristics for narrow-band digital loudspea
45、king and hands-free telephony terminals“. 19 Recommendation ITU-T P.501: “Test signals for use in telephonometry“. NOTE: At the publication date of the present document, annex C to P.501 is available as P.501, Amendment 2. 20 Recommendation ITU-T P.502: “Objective test methods for speech communicati
46、on systems using complex test signals“. 21 Recommendation ITU-T P.581: “Use of head and torso simulator for hands-free and handset terminal testing“. 22 Recommendation ITU-T P.862: “Perceptual evaluation of speech quality (PESQ): An objective method for end-to-end speech quality assessment of narrow
47、-band telephone networks and speech codecs“. 23 IEC 61260: “Electroacoustics - Octave-band and fractional-octave-band filters“. 24 Recommendation ITU-T P.800.1: “Mean Opinion Score (MOS) terminology“. 25 ETSI ES 202 396-1: “Speech and multimedia Transmission Quality (STQ); Speech quality performance
48、 in the presence of background noise; Part 1: Background noise simulation technique and background noise database“. 26 Recommendation ITU-T P.863.1: “Application guide for Recommendation ITU-T P.863“. 27 Recommendation ITU-T P.863: “Perceptual objective listening quality assessment“. 28 ETSI ES 202
49、718: “Speech and multimedia Transmission Quality (STQ); Transmission Requirements for IP-based Narrowband and Wideband Home Gateways and Other Media Gateways from a QoS Perspective as Perceived by the User“. 2.2 Informative references References are either specific (identified by date of publication 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 reference document (including any amendments) applies
