1、 ETSI ES 202 740 V1.5.1 (2017-01) Speech and multimedia Transmission Quality (STQ); Transmission requirements for wideband VoIP loudspeaking and handsfree terminals from a QoS perspective as perceived by the user ETSI STANDARD ETSI ETSI ES 202 740 V1.5.1 (2017-01) 2 Reference RES/STQ-245 Keywords ha
2、ndsfree, loudspeaking, quality, speech, terminal, VoIP, wideband 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
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8、f ETSI 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 202 740 V1.5.1 (2017-01) 3 Conten
9、ts 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 Coding
10、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 . 12g35.6 I
11、nfluence 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 terminals 14g36.2.2.1 Hands-free measurements . 14g36.2.2.2 Measurements in loudspeaking mode . 19g36.2.3 Test signal levels
12、 . 19g36.2.3.1 Send. 19g36.2.3.2 Receive 20g36.2.4 Setup of background noise simulation 20g36.3 Coding independent parameters . 20g36.3.1 Send sensitivity/frequency response . 20g36.3.2 Send Loudness Rating (SLR) 21g36.3.3 Mic mute . 22g36.3.4 Send distortion 22g36.3.5 Out-of-band signals in send di
13、rection . 23g36.3.6 Send noise . 23g36.3.7 Terminal Coupling Loss (TCL) 24g36.3.8 Stability loss 24g36.3.9 Receive frequency response 25g36.3.10 Receive Loudness Rating (RLR) 27g36.3.11 Receive distortion . 28g36.3.12 Out-of-band signals in receive direction . 29g36.3.13 Receive noise 29g36.3.14 Dou
14、ble talk performance 30g36.3.14.1 General 30g36.3.14.2 Attenuation range in send direction during double talk AH,S,dt30g36.3.14.3 Attenuation range in receive direction during double talk AH,R,dt31g36.3.14.4 Detection of echo components during double talk 32g36.3.14.5 Minimum activation level and se
15、nsitivity of double talk detection . 33g3ETSI ETSI ES 202 740 V1.5.1 (2017-01) 4 6.3.15 Switching characteristics 33g36.3.15.1 Note . 33g36.3.15.2 Activation in send direction 34g36.3.15.3 Silence suppression and comfort noise generation 34g36.3.16 Background noise performance 34g36.3.16.1 Performan
16、ce in send direction in the presence of background noise . 34g36.3.16.2 Speech quality in the presence of background noise . 35g36.3.16.3 Quality of background noise transmission (with far end speech) 36g36.3.17 Quality of echo cancellation . 37g36.3.17.1 Temporal echo effects . 37g36.3.17.2 Spectra
17、l echo attenuation 37g36.3.17.3 Occurrence of artefacts . 38g36.3.17.4 Variable echo path. 38g36.3.18 Variant impairments; network dependant . 39g36.3.18.1 Clock accuracy send 39g36.3.18.2 Clock accuracy receive . 40g36.3.18.3 Send delay variation 40g36.3.19 Send and receive delay - round trip delay
18、 . 41g36.4 Codec specific requirements. 42g36.4.1 Objective listening speech quality MOS-LQO in send direction 42g36.4.2 Objective listening quality MOS-LQO in receive direction . 43g36.4.3 Quality of jitter buffer adjustment 44g3Annex A (informative): Processing delays in VoIP terminals 47g3Annex B
19、 (informative): Bibliography . 50g3History 51g3ETSI ETSI ES 202 740 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 for ET
20、SI 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 (https:/i
21、pr.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, essential
22、 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“ and “c
23、annot“ 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 were int
24、erfacing switched-circuit 64 kbit/s PCM networks. With the fast growth of IP networks, wideband terminals providing higher audio-bandwidth and directly interfacing packet-switched networks (VoIP) are being rapidly introduced. Such IP network edge devices may include gateways, specifically designed I
25、P phones, soft phones or other devices connected to the IP based networks and providing telephony service. Due to 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. Termi
26、nals are getting increasingly complex. 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 meaningful results. The present document provides speech transmi
27、ssion performance requirements for wideband 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 202 740 V1.5.1 (2017-01) 6 1 Scope The present document provides speech transmission perfor
28、mance requirements for 8 kHz wideband 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 minimum performance requirements it is the intention of the present do
29、cument 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 document describes advanced testing procedures taking into account fu
30、rther 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 number or version number) or non-specific. For specific references,
31、 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 might be found at http:/docbox.etsi.org/Reference. NOTE: While an
32、y 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 300 245-6: “Integrated Services Digital Network (ISDN); Technical cha
33、racteristics of telephony terminals; Part 6: Wideband (7 kHz), loudspeaking and hands free telephony“. 2 Recommendation ITU-T G.108: “Application of the E-model: A planning guide“. 3 Recommendation ITU-T G.109: “Definition of categories of speech transmission quality“. 4 Recommendation ITU-T G.722:
34、“7 kHz audio-coding within 64 kbit/s“. 5 Recommendation ITU-T G.722.1: “Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss“. 6 Recommendation ITU-T G.722.2: “Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB)“. 7 R
35、ecommendation ITU-T G.729.1: “G.729 based Embedded Variable bit-rate coder: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729“. 8 Recommendation ITU-T P.56: “Objective measurement of active speech level“. 9 Recommendation ITU-T P.58: “Head and torso simulator for telephonomet
36、ry“. 10 Recommendation ITU-T P.79: “Calculation of loudness ratings for telephone sets“. 11 Recommendation ITU-T P.310: “Transmission characteristics for narrow-band digital handset and headset telephones“. 12 Recommendation ITU-T P.340: “Transmission characteristics and speech quality parameters of
37、 hands-free terminals“. ETSI ETSI ES 202 740 V1.5.1 (2017-01) 7 13 Recommendation ITU-T P.341: “Transmission characteristics for wideband digital loudspeaking and hands-free telephony terminals“. 14 Recommendation ITU-T P.501: “Test signals for use in telephonometry“. 15 Recommendation ITU-T P.502:
38、“Objective test methods for speech communication systems using complex test signals“. 16 Recommendation ITU-T P.581: “Use of head and torso simulator (HATS) for hands-free terminal testing“. 17 IEC 61260-1: “Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications“.
39、 18 Recommendation ITU-T P.800.1: “Mean Opinion Score (MOS) terminology“. 19 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“. 20 Recommen
40、dation ITU-T P.863.1: “Application guide for Recommendation ITU-T P.863“. 21 Recommendation ITU-T P.863: “Perceptual objective listening quality assessment“. 22 ETSI ES 202 737: “Speech and multimedia Transmission Quality (STQ); Transmission requirements for narrowband VoIP terminals (handset and he
41、adset) from a QoS perspective as perceived by the user“. 23 Recommendation ITU-T P.1010: “Fundamental voice transmission objectives for VoIP terminals and gateways“. 24 IETF RFC 3550: “RTP: A Transport Protocol for Real-Time Applications“. 25 TIA-920.130: “Transmission Requirements for Wideband Digi
42、tal Wireline Telephones with Headset“. 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 th
43、e referenced document (including any amendments) applies. 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 not necessary for the application of the present document but the
44、y assist the user with regard to a particular subject area. i.1 ETSI EG 202 425: “Speech 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
45、 the presence of background noise; Part 3: Background noise transmission - Objective 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 Recommendation ITU-T G.729: “Coding of speech at
46、 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP)“. ETSI ETSI ES 202 740 V1.5.1 (2017-01) 8 i.6 Recommendation ITU-T G.723.1: “Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s“. i.7 ETSI EG 201 377-1: “Speech and multimedia
47、 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
48、wing terms and definitions apply: artificial ear: device for the calibration of earphones incorporating an acoustic coupler and a calibrated microphone for the measurement of the sound pressure and having an overall acoustic impedance similar to that of the median adult human ear over a given freque
49、ncy band codec: combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions of transmission in the same equipment ear-Drum Reference Point (DRP): point located at the end of the ear canal, corresponding to the ear-drum position freefield equalization: artificial head is equalized in such a way that for frontal sound incidence in anechoic conditions the frequency response of the artificial head is flat freefield reference point: point located in the free sound
