1、 ETSI ES 202 740 V1.4.1 (2015-03) 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 V1.4.1 (2015-03) 2 Reference RES/STQ-205 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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7、ersion 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 reg
8、istered 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 V1.4.1 (2015-03) 3 Contents Intelle
9、ctual 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 . 10g34.1 Coding Algorithm
10、. 10g34.2 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 . 12g35.3
11、Accuracy of measurements and test signal generation . 12g35.4 Network impairment simulation . 12g35.5 Acoustic environment . 13g35.6 Influence of terminal delay on measurements 14g36 Test Setup . 14g36.1 Setup for terminals . 15g36.1.1 Hands-free measurements . 15g36.1.2 Measurements in loudspeaking
12、 mode . 19g36.2 Test signal levels 19g36.2.1 Send 19g36.2.2 Receive . 20g36.3 Setup of background noise simulation 20g37 Measurements and Requirements for Basic Parameters 21g37.1 Coding independent parameters . 21g37.1.1 Send sensitivity/frequency response . 21g37.1.1.1 Requirement 21g37.1.1.2 Meas
13、urement method 22g37.1.2 Send loudness rating . 23g37.1.2.1 Requirement 23g37.1.2.2 Measurement method 23g37.1.3 Send distortion 23g37.1.3.1 Requirement 23g37.1.3.2 Measurement method 23g37.1.4 Out-of-band signals in send direction (informative) . 24g37.1.4.1 Requirement 24g37.1.4.2 Measurement meth
14、od 24g37.1.5 Send noise . 24g37.1.5.1 Requirement 24g37.1.5.2 Measurement method 24g37.1.6 Receive Frequency Response . 25g37.1.6.1 Requirement 25g37.1.6.2 Measurement method 26g3ETSI ETSI ES 202 740 V1.4.1 (2015-03) 4 7.1.7 Receive Loudness Rating 27g37.1.7.1 Requirement 27g37.1.7.2 Measurement met
15、hod 27g37.1.8 Receive distortion . 28g37.1.8.1 Requirement 28g37.1.8.2 Measurement method 28g37.1.9 Out-of-band signals in receive direction (informative) . 28g37.1.9.1 Requirement 28g37.1.9.2 Measurement Method 29g37.1.10 Receive noise 29g37.1.10.1 Requirement 29g37.1.10.2 Measurement method 29g37.
16、1.11 Terminal Coupling Loss . 29g37.1.11.1 Requirement 29g37.1.11.2 Measurement method 29g37.1.12 Stability Loss 30g37.1.12.1 Requirement 30g37.1.12.2 Measurement method 30g37.2 Codec Specific Requirements. 30g37.2.1 Send Delay 30g37.2.1.1 Requirement 31g37.2.1.2 Measurement Method 31g37.2.2 Receive
17、 delay 32g37.2.2.1 Requirements 32g37.2.2.2 Measurement Method 33g38 Measurements and Requirements for Parameters with respect to Speech Processing Devices . 33g38.1 Objective Listening Speech Quality MOS-LQOM in Send direction 33g38.2 Objective Listening Quality MOS-LQOM in Receive direction 33g38.
18、3 Minimum activation level and sensitivity in Receive direction . 33g38.4 Automatic Level Control in Receive 33g38.5 Double Talk Performance. 33g38.5.1 Attenuation Range in Send Direction during Double Talk AH,S,dt. 34g38.5.1.1 Requirement 34g38.5.1.2 Measurement Method 34g38.5.2 Attenuation Range i
19、n Receive Direction during Double Talk AH,R,dt35g38.5.2.1 Requirement 35g38.5.2.2 Measurement Method 35g38.5.3 Detection of Echo Components during Double Talk 35g38.5.3.1 Requirement 35g38.5.3.2 Measurement Method 36g38.5.4 Minimum activation level and sensitivity of double talk detection 37g38.5.5
20、Switching characteristics 37g38.5.5.1 Activation 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 . 38g38.5.5.3.1 Requirement 38g
21、38.5.5.3.2 Measurement Method 39g38.5.5.4 Speech 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 Q
22、uality of echo cancellation . 41g38.5.6.1 Temporal echo effects . 41g38.5.6.1.1 Requirements . 41g38.5.6.1.2 Measurement Method 41g38.5.6.2 Spectral Echo Attenuation . 41g3ETSI ETSI ES 202 740 V1.4.1 (2015-03) 5 8.5.6.2.1 Requirements . 41g38.5.6.2.2 Measurement Method 41g38.5.6.3 Occurrence of Arte
23、facts 42g38.5.7 Variant Impairments; Network dependant 42g38.5.7.1 Send and receive delay - Round trip delay 42g38.5.7.2 Delay versus Time Send 43g38.5.7.3 Delay versus Time Receive . 43g38.5.7.4 Quality of Jitter buffer adjustment 43g3Annex A (informative): Processing delays in VoIP terminals 46g3A
24、nnex B (informative): Bibliography . 49g3History 50g3ETSI ETSI ES 202 740 V1.4.1 (2015-03) 6 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
25、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 (ht
26、tp:/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, essen
27、tial 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“ an
28、d “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 were
29、 interfacing 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 design
30、ed IP 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. T
31、erminals 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 tra
32、nsmission 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 V1.4.1 (2015-03) 7 1 Scope The present document provides speech transmission pe
33、rformance 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 presen
34、t 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 document describes advanced testing procedures taking into accoun
35、t 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 number or version number) or non-specific. For specific referen
36、ces, only the cited version applies. For non-specific references, 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
37、 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 ETSI I-ETS 300 245-6: “Integrated Services Digital Network (ISDN); Techn
38、ical characteristics of telephony terminals; Part 6: Wideband (7 kHz), loudspeaking and hands free 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
39、 version 6.0.0 Release 6)“. 3 Recommendation ITU-T G.108: “Application of the E-model: A planning guide“. 4 Recommendation ITU-T G.109: “Definition of categories of speech transmission quality“. 5 Void. 6 Void. 7 Recommendation ITU-T G.711: “Pulse code modulation (PCM) of voice frequencies“. 8 Recom
40、mendation ITU-T G.722: “7 kHz audio-coding within 64 kbit/s“. 9 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“. 10 Recommendation ITU-T G.729.1: “G.729 based Embedded Variable bit-rate coder: An 8-32 kbit/s scalable w
41、ideband coder bitstream interoperable with G.729“. 11 Recommendation ITU-T G.1020: “Performance parameter definitions for quality of speech and other voiceband applications utilizing IP networks“. 12 Recommendation ITU-T P.50: “Artificial voices“. 13 Recommendation ITU-T P.56: “Objective measurement
42、 of active speech level“. ETSI ETSI ES 202 740 V1.4.1 (2015-03) 8 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.310: “Transmission characteristics for telephon
43、e band (300-3400 Hz) digital telephones“. 17 Recommendation ITU-T P.340: “Transmission characteristics and speech quality parameters of hands-free terminals“. 18 Recommendation ITU-T P.341: “Transmission characteristics for wideband (150-7000 Hz) digital hands-free telephony terminals“. 19 Recommend
44、ation 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 communication systems using complex test signals“. 21 Recommendat
45、ion ITU-T P.581: “Use of head and torso simulator (HATS) for hands-free 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-band telephone networks and speech codecs“. 23 IEC 61260:
46、“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 in the presence of background noise; Part 1: Background noi
47、se 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 202 718: “Speech and multimedia Transmission Quality (STQ); Tran
48、smission 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. F
49、or specific references, only the cited version applies. For non-specific references, the latest version of the reference 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 they assist the user with regard to a particular subject area. i.1 ETSI EG 202 425: “Speech Processing, Transmission an
