1、 ETSI ES 202 396-1 V1.7.1 (2017-10) 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 ETSI STANDARD ETSI ETSI ES 202 396-1 V1.7.1 (2017-10)2 Reference RES/STQ-2
2、51 Keywords noise, performance, quality, speech 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 Important notice
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7、shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. ETSI 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and
8、LTE are trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members. GSM and the GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI ES 202 396-1 V1.7.1 (2017-10)3 Contents In
9、tellectual Property Rights 5g3Foreword . 5g3Modal verbs terminology 5g3Introduction 5g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Definitions and abbreviations . 8g33.1 Definitions 8g33.2 Abbreviations . 8g34 Overview of existing methods for realistic so
10、und reproduction. 8g34.1 Introduction 8g34.2 Surround Sound Techniques. 9g34.3 IOSONO. 10g34.4 Eidophonie . 10g34.5 Four-loudspeaker arrangement for playback of binaurally recorded signals 11g34.6 NTT Background-Noise Database . 12g34.7 General conclusions . 12g35 Recording arrangement 13g35.1 Binau
11、ral equalization 13g35.2 The equalization procedure 13g36 Loudspeaker Setup for Background Noise Simulation 15g36.1 Test Room Requirements . 15g36.2 Loudspeaker Positioning 15g36.3 Equalization and Calibration 16g36.4 Accuracy of the reproduction arrangement 22g36.4.0 Introduction. 22g36.4.1 Compari
12、son between original sound field and simulated sound field . 22g36.4.2 Displacement of the test arrangement in the simulated sound field 23g36.4.3 Transmission of background noise: Comparison of terminal performance in the original sound field and the simulated sound field . 25g36.5 Simulation of ad
13、ditional acoustic conditions 29g37 Background Noise Simulation in cars 30g37.1 General setup 30g37.2 Recording arrangement 31g37.2.0 Introduction. 31g37.2.1 Recording setup with the terminals microphone 31g37.2.2 Recording setup with a pair of cardioid microphones. 32g37.3 Equalization and Calibrati
14、on with the terminals microphone 32g37.4 Equalization and Calibration with a pair of cardioid microphones 37g37.5 Accuracy of the reproduction arrangement 42g37.5.1 Comparison between original sound field and simulated sound field . 42g37.5.2 Transmission of background noise: Comparison of terminal
15、performance in the original sound field and the simulated sound field . 43g38 Background Noise Database 46g38.0 Introduction 46g38.1 Binaural signals 46g38.2 Binaural signals identical to the background noise recordings provided in ETSI TS 103 224 . 49g38.3 Stereophonic signals . 50g3ETSI ETSI ES 20
16、2 396-1 V1.7.1 (2017-10)4 Annex A (informative): Comparison of Tests in Sending Direction and D-Values Conducted in Different Rooms . 51g3A.0 Introduction 51g3A.1 Test Setup . 51g3A.2 Results of the Tests 52g3A.2.0 Introduction 52g3A.2.1 Sending Frequency Response Characteristics and SLR . 52g3A.2.2
17、 D-Value with Pink Noise . 52g3A.2.3 D-Value with Cafeteria Noise 53g3A.3 Conclusions 53g3Annex B (informative): Graphs 54g3History 62g3ETSI ETSI ES 202 396-1 V1.7.1 (2017-10)5 Intellectual Property Rights Essential patents IPRs essential or potentially essential to the present document may have bee
18、n 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 potentially Essential, IPRs notified to ETSI in respect of ETSI standards“,
19、 which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/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 referenc
20、ed 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. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these excep
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22、. Foreword This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission Quality (STQ). The present document is part 1 of a multi-part deliverable covering Speech and multimedia Transmission Quality (STQ); Speech quality performance in the presence of backg
23、round noise, as identified below: ETSI ES 202 396-1: “Background noise simulation technique and background noise database“; ETSI EG 202 396-2: “Background noise transmission - Network simulation - Subjective test database and results“; ETSI EG 202 396-3: “Background noise transmission - Objective te
24、st methods“. 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 provisions). “must“ and
25、 “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. Introduction Background noise is present in most of the conversations today. Background noise may impact the speech communication performance to terminal and network equipment significantly. Therefore testing and o
26、ptimization of such equipment is necessary using realistic background noises. Furthermore reproducible conditions for the tests are required which can be guaranteed only under lab type condition. The present document addresses this issue by describing a methodology for recording and playback of back
27、ground noises under well-defined and calibratable conditions in a lab-type environment. Furthermore a database with real background noises is included. ETSI ETSI ES 202 396-1 V1.7.1 (2017-10)6 1 Scope The quality of background noise transmission is an important factor, which significantly contribute
28、s to the perceived overall quality of speech. Existing and even more the new generation of terminals, networks and system configurations including broadband services can be greatly improved with a proper design of terminals and systems in the presence of background noise. The present document: descr
29、ibes a noise simulation environment using realistic background noise scenarios for laboratory use; contains a database including the relevant background noise samples for subjective and objective evaluation. The present document provides information about the recording techniques needed for backgrou
30、nd noise recordings and discusses the advantages and drawbacks of existing methods. The present document describes the requirements for laboratory conditions. The loudspeaker setup and the loudspeaker calibration and equalization procedure are described. The simulation environment specified can be u
31、sed for the evaluation and optimization of terminals and of complex configurations including terminals, networks and other configurations. The main application areas should be: office, home and car environment. The setup and database as described in the present document are applicable for: Objective
32、 performance evaluation of terminals in different (simulated) background noise environments. Speech processing evaluation by using the pre-processed speech signal in the presence of background noise, recorded by a terminal. Subjective evaluation of terminals by performing conversational tests, speci
33、fic double talk tests or talking and listening tests in the presence of background noise. Subjective evaluation in third party listening tests by recording the speech samples of terminals in the presence of background noise. 2 References 2.1 Normative references References are either specific (ident
34、ified 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 referenced document (including any amendments) applies. Referenced documents which are not found to b
35、e publicly available in the expected location might be found at https:/docbox.etsi.org/Reference. 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 necessary for the applica
36、tion of the present document. Not applicable. 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 versio
37、n of the 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. ETSI ETSI ES 202 396-1 V1.7.1 (2017-10)7 The following referenced documents are not necessary for
38、 the application of the present document but they assist the user with regard to a particular subject area. i.1 Surround Sound Past, Present, and Future: “A history of multichannel audio from mag stripe to Dolby Digital“, Joseph Hull - Dolby Laboratories Inc. i.2 AES preprint 3332 (1992): “Improved
39、Possibilities of Binaural Recording and Playback Techniques“, K. Genuit, H.W. Gierlich; U. Knzli. NOTE: Available at http:/www.aes.org/e-lib/browse.cfm?elib=6801. i.3 AES preprint 3732 (1993): “A System for the Reproduction Technique for Playback of Binaural Recordings“, N. Xiang, K. Genuit, H.W. Gi
40、erlich. NOTE: Available at http:/www.aes.org/e-lib/browse.cfm?elib=6501. i.4 NTTAT Database: “Ambient Noise Database CD-ROM“. NOTE: Available at http:/www.ntt- i.5 ISO 11904-1: “Acoustics - Determination of sound imission from sound sources placed close to the ear - Part 1: Technique using a microph
41、one in a real ear (MIRE technique)“. i.6 Spatial Hearing: “The psychophysics of human sound localization“, J. Blauert. i.7 Recommendation ITU-T P.57: “Artificial ears“. i.8 Recommendation ITU-T P.58: “Head and torso simulator for telephonometry“. i.9 Recommendation ITU-T P.340: “Transmission charact
42、eristics and speech quality parameters of hands-free terminals“. i.10 Recommendation ITU-T P.64: “Determination of sensitivity/frequency characteristics of local telephone systems“. i.11 Recommendation ITU-T G.722: “7 kHz audio-coding within 64 kbit/s“. i.12 Genuit, K.: “A Description of the Human O
43、uter Ear Transfer Function by Elements of Communication Theory (No. B6-8)“. NOTE: Proceedings of the 12thInternational Congress on Acoustics. Toronto published on behalf of the Technical Program Committee by the Executive Committee of the 12thInternational Congress on Acoustics. i.13 IEC 60050-722:
44、“International Electrotechnical Vocabulary - Chapter 722: Telephony“. i.14 “Wellenfeldsynthese - Eine neue Dimension der 3D-Audiowiedergabe“; Fernseh- und Kino-Technik, Nr. 11/2002, pp. 735-738. i.15 “The Iosono Sound Difference“. NOTE: Available at http:/www.iosono-sound.de. i.16 “Ein neues Verfahr
45、en der raumbezogenen Stereophonie mit verbesserter bertragung der Rauminformation“; P. Scherer, Rundfunktechnische Mitteilungen, 1977, pp. 196-204. i.17 ETSI EG 202 396-1 (V1.1.2): “Speech Processing, Transmission and Quality Aspects (STQ); Speech quality performance in the presence of background no
46、ise; Part 1: Background noise simulation technique and background noise database“. i.18 ETSI TS 151 010-1: “Digital cellular telecommunications system (Phase 2+); Mobile Station (MS) conformance specification; Part 1: Conformance specification (3GPP TS 51.010-1)“. i.19 ETSI TS 103 224: “Speech and m
47、ultimedia Transmission Quality (STQ); A sound field reproduction method for terminal testing including a background noise database“. ETSI ETSI ES 202 396-1 V1.7.1 (2017-10)8 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions
48、apply: crosstalk: appearance of undesired energy in a channel, owing to the presence of a signal in another channel, caused by, for example induction, conduction or non-linearity NOTE: See IEC 60050-722 i.13. 3.2 Abbreviations For the purposes of the present document, the following abbreviations app
49、ly: CD Compact Disc EQ Equalization FFT Fast Fourier Transform FIR Finite Impulse Response HATS Head And Torso Simulator IIR Infinite Impulse Response MIRE Microphone In Real Ear MRP Mouth Reference PointNTT Nippon Telegraph and Telephone corporation SLR Send Loudness Rating VHF Very High Frequency 4 Overview of existing methods for realistic sound reproduction 4.1 Introduction In general the existing methods for close to original sound recording and reproduction aimed for different applicati
