1、 ETSI TR 143 058 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); Characterisation, test methods and quality assessment for handsfree Mobile Stations (MSs) (3GPP TR 43.058 version 14.0.0 Release 14) TECHNICAL REPORT GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TR 1
2、43 058 V14.0.0 (2017-04)13GPP TR 43.058 version 14.0.0 Release 14Reference RTR/TSGS-0443058ve00 Keywords GSM 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 enregistr
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12、which are, or may be, or may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM i
13、dentities. These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “should“, “should not“, “may“
14、, “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 provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 143 058 V14.0
15、.0 (2017-04)33GPP TR 43.058 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 Characteristics, test methods and quality a
16、ssessment . 7g34.1 Environmental conditions for a car type handsfree Mobile Station . 7g34.1.1 Data available on real use environment 7g34.1.1.1 Reverberation and echo . 7g34.1.1.2 Sources and types of noise. Level and Spectra of the noise 8g34.1.1.2.1 Noise due to engine, tyres and moving situation
17、s . 8g34.1.1.2.2 Noise due to equipment inside the cars . 13g34.1.1.2.3 Signal to noise ratio in the car situation . 14g34.1.1.3 Noise and echo 15g34.1.2 Environment for testing handsfree mobile station 17g34.1.2.1 Classification of handsfree mobile terminals 17g34.1.2.2 Vehicle simulator 17g34.1.2.
18、2.1 Cost estimation for a vehicle simulator for handsfree testing 17g34.1.2.3 Advisory text for installation of handsfree MS in a vehicle environment . 18g34.1.2.4 Test environment . 18g34.1.2.4.1 Anechoic room 18g34.1.2.4.2 “ Real use “ situation (Handsfree in a real car or in a car simulator) . 18
19、g34.1.3 Measurements on a GSM handsfree telephone - Influence of the environment and the test conditions on frequency responses and loudness ratings . 19g34.2 Delay in handsfree terminals implemented with signal processing techniques 22g34.2.1 Signal processing techniques for acoustic echo cancellin
20、g and noise reduction . 22g34.2.2 Examples of delays due to signal processing techniques 22g34.2.2.1 Data produced by Matra Communication . 22g34.2.2.2 Data produced by Ericsson 23g34.3 Speech quality assessment 24g34.3.1 General - Factors affecting the speech quality of the GSM system and derivativ
21、es . 24g34.3.2 Main Assessment Criteria for Handsfree processing used in GSM mobile environment . 27g34.3.3 Evaluation Methodology for Full-Duplex Acoustic Echo Controllers developed within the FREETEL-Esprit project 28g34.3.3.1 Objective Evaluation procedure 28g34.3.3.1.1 Objective Evaluation metho
22、dology of AEC devices . 29g34.3.3.1.2 Test Signals used from the FREETEL-Esprit Database 32g34.3.3.2 Adapted objective evaluation procedure to a GSM Handsfree mobile . 33g34.3.3.2.1 Motivation of an adapted evaluation procedure 33g34.3.3.2.2 Objective evaluation procedure for prototyping the GSM Han
23、dsfree AEC algorithms 33g34.3.3.2.3 Proposed Objective-Subjective Evaluation procedure. 35g34.3.3.2.4 Derived Evaluation schemes for Handsfree mobile telephones . 35g34.3.4 Subjective tests . 38g34.3.4.1 Subjective opinion tests . 38g34.3.4.1.1 Listening opinion tests . 38g34.3.4.1.2 Conversation Op
24、inion Tests 38g34.3.4.1.3 Proposed test method . 38g34.3.4.2 Subjective tests extracted from “Ultimate test set“ . 39g3Annex A: Subjective Tests from UTS . 41g3ETSI ETSI TR 143 058 V14.0.0 (2017-04)43GPP TR 43.058 version 14.0.0 Release 14Annex B: Bibliography 45g3B.1 References of TD presented in S
25、MG2/ad hoc 03.50 meetings. 45g3B.2 References from subclause 4.1 . 45g3B.3 References from subclause 4.2.1 46g3B.4 References from subclause 4.3.1 46g3B.5 References from subclause 4.3.3 46g3Annex C (informative): Change history . 47g3History 48g3ETSI ETSI TR 143 058 V14.0.0 (2017-04)53GPP TR 43.058
26、 version 14.0.0 Release 14Foreword This Technical Report has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the prese
27、nt document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under chan
28、ge control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TR 143 058 V14.0.0 (2017-04)63GPP TR 43.058 version 14.0.
29、0 Release 141 Scope The present document gives some guidelines to implement test methods and to evaluate the transmission quality of handsfree Mobile Stations (MSs). The normative characteristics and test methods for handsfree Mobile Stations (MSs are defined in GSM 03.50). The present document give
30、s additional data. It includes summaries of texts or contributions presented and discussed during the meetings of ad hoc group SMG2/03.50 on environmental conditions, speech processing and quality assessment for handsfree Mobile Station. The items covered by this report are mainly. - Environmental c
31、onditions for handsfree Mobile Stations. - Speech processing techniques and consequences on delay. - Speech quality assessment for handsfree implementing acoustic echo cancellation and noise reduction. 2 References The following documents contain provisions which, through reference in this text, con
32、stitute provisions of the present document. References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. In the case of
33、a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. 1 I-ETS 300 245-3: “Integrated Services Digital Network (ISDN);Technical characteristics of telephony terminals; P
34、art 3: Pulse Code Modulation (PCM) A-law“. 2 ITU-T Recommendation G.113: “Transmission Impairments Quantisation Distortion“. 3 ITU-T Recommendation G.114: “Transmission Impairments, Delay“. 4 ITU-T Recommendation G.165: “Performances of Network Echo Cancellers“. 5 ITU-T Recommendation G.167: “Perfor
35、mance of acoustic echo control devices“. 6 ITU-T Recommendation G.711: “64 kbit/s Pulse Code Modulation (PCM)“. 7 ITU-T Recommendation G.721: “32 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)“. 8 ITU-T Recommendation G.728: “16 kbit/s Low Delay CELP“. 9 ITU-T Recommendation G.729: “8 kb
36、it/s ACELP“. 10 ITU-T Recommendation G.731: “Echo“. 11 ITU-T Recommendation P.50: “Artificial Voices“. 12 ITU-T Recommendation P.58: “Head and Torso Simulator (HATS) for telephonometry“. 13 ITU-T Recommendation P.340: “Transmission Characteristics of Handsfree Telephones“. 14 ITU-T Handbook On Telep
37、honometry, Geneva 1987. 15 GSM 03.50: “Digital cellular telecommunications system (Phase 2+); Transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system“. ETSI ETSI TR 143 058 V14.0.0 (2017-04)73GPP TR 43.058 version 14.0.0 Release 143 Definitions and abb
38、reviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Terminal Coupling Loss (TCL): frequency dependent coupling loss between the receiving port and sending port of a terminal due to: - acoustical coupling at the user interface; - electrical
39、coupling due to crosstalk in the handset cord or within the electrical circuits; - seismic coupling through the mechanical parts of the terminal. NOTE 1: The receiving port and the sending port of a digital voice terminal is a 0 dBr point. NOTE 2: The coupling at the user interface depends on the co
40、nditions of use. Weighted Terminal Coupling Loss (TCLW): weighted Terminal Coupling Loss using the weighting of CCITT Recommendation G.122. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: HATS Head and Torso Simulator MRP Mouth Reference PointRLR Receiv
41、e Loudness Rating SLR Send Loudness Rating TCL Terminal Coupling LossTCLw Weighted Terminal Coupling Loss 4 Characteristics, test methods and quality assessment 4.1 Environmental conditions for a car type handsfree Mobile Station 4.1.1 Data available on real use environment 4.1.1.1 Reverberation and
42、 echo a) From Background acoustic noise reduction in mobile telephony (see subclause B.2 reference 1). The reverberation times determined from the impulse response inside the cabin are in the order of 25 ms. b) From Speech enhancement for mobile telephony (see subclause B.2 reference 2). The reverbe
43、ration time, determined from the impulse response, is around 30ms (it is assumed that the long impulse of the source - a small loudspeaker - may explain why this result is greater that value determined by, reference 1 of subclause B.2. c) From Contribution lamlioration des performances dun radiotele
44、phone mains-libres commande vocale (see subclause B.2 reference 3). The reverberance, in this report, is not defined directly by the reverberation time, but by the part of impulse response energy (from0 to t), relative to total energy, as a time function. ETSI ETSI TR 143 058 V14.0.0 (2017-04)83GPP
45、TR 43.058 version 14.0.0 Release 14Table 1 Time (ms) Loss (dB). R25 Loss (dB). 505 10 10.2 9.220 22.5 20.230 32.5 30.54.1.1.2 Sources and types of noise. Level and Spectra of the noise 4.1.1.2.1 Noise due to engine, tyres and moving situations a) From Acoustic noise analysis and speech enhancement f
46、or mobile radio applications (see subclause B.2 reference 4). - Test conditions. - Car: Alfa Romeo Alfetta 200J. - Supercardioid directional microphones. - Microphone positions: 3 Measurement positions (Front seats, driver and passenger head positions. Middle of rear seat, passenger head position).
47、In these 3 positions, the signals are almost the same. - Signal analysis: DFT analysis. Table 2 Testing conditions Vehicle speed (km/h) Engine rate (r.p.m.) Road pavement a 0 4000 asphaltb 100 0 asphalt - Noise - in testing condition “ a “: a very high peak of energy appears around 120 Hz, at the fu
48、ndamental frequency of the four strokes four cylinders engine noise. The noise power spectrum decreases hardly between this frequency and 3 kHz. - in testing condition “ b “: (gear in neutral position, engine kept off), the peak of power in low frequency region disappears and the noise power between
49、 1 kHz and 6 kHz increases considerably relative to condition “ a “. b) From Background acoustic noise reduction in mobile telephony (see subclause B.2 reference 1) - Test conditions. Measurements were made in a typical mid-size North American car. - Noise spectrum. see figure 1. ETSI ETSI TR 143 058 V14.0.0 (2017-04)93GPP TR 43.058 version 14.0.0 Release 14Figure 1: Noise spectrum The noise power spectrum inside the cabin is mainly located in very low frequencies (below 250 Hz). Comparing the noise outside and inside the
