ETSI EG 202 396-2-2006 Speech Processing Transmission and Quality Aspects (STQ) Speech Quality performance in the presence of background noise Part 2 Background noise transmission .pdf
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1、 ETSI EG 202 396-2 V1.1.1 (2006-09)ETSI Guide Speech Processing, Transmission and Quality Aspects (STQ);Speech quality performancein the presence of background noise;Part 2: Background noise transmission - Network simulation -Subjective test database and resultsETSI ETSI EG 202 396-2 V1.1.1 (2006-09
2、) 2 Reference DEG/STQ-00038-2 Keywords noise, QoS, 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 Import
3、ant notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the
4、Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Inform
5、ation on the current status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No par
6、t may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2006. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefi
7、t of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI EG 202 396-2 V1.1.1 (2006-09) 3 Contents Intell
8、ectual Property Rights5 Foreword.5 1 Scope 6 2 References 6 3 Abbreviations .8 4 Performance parameters.9 4.1 Overview 9 4.2 Performance key parameters 9 4.2.1 Delay.9 4.2.1.1 Codec delay.10 4.2.1.2 Packetization delay10 4.2.1.3 Output queuing delay 10 4.2.1.4 Serialization delay.10 4.2.1.5 Network
9、delay.11 4.2.1.5.1 Network switching delay.11 4.2.1.5.2 Propagation delay 11 4.2.1.6 De-jitter delay .11 4.2.2 Jitter 11 4.2.3 Packet loss 12 4.3 Parameter interaction and dependences12 5 Description of codecs features .13 5.1 Speech coding algorithm 13 5.1.1 Waveform codecs .13 5.1.2 Vocoders.13 5.
10、1.3 Hybrid codecs .13 5.2 Bit-rate13 5.2.1 Constant Bit Rate (CBR) 13 5.2.2 Variable Bit Rate (VBR).13 5.3 Discontinuous Transmission (DTX).14 5.3.1 Voice Activity Detection (VAD)14 5.3.2 Comfort Noise Generator (CNG)14 5.4 Packet Loss Concealment (PLC)14 5.5 Perceptual enhancement .14 6 Wideband co
11、decs14 6.1 Overview 14 6.2 Description of WideBand codecs .15 6.2.1 ITU-T Recommendation G.72215 6.2.1.1 Overview.15 6.2.1.2 Modes of operation .15 6.2.1.3 Encoder and decoder.15 6.2.1.4 Frame structure .16 6.2.2 AMR-WB .16 6.2.2.1 Overview.16 6.2.2.2 Modes of operation .17 6.2.2.3 Encoder and decod
12、er.17 6.2.2.4 Frame structure .18 6.2.3 Other wideband codecs.19 6.2.3.1 Speex WB .19 6.2.3.1.1 Overview .19 6.2.3.1.2 Modes of operation20 6.2.3.1.3 Encoder and decoder .20 6.2.3.1.4 Frame structure20 6.2.3.2 ITU-T Recommendation G.722.1 .21 ETSI ETSI EG 202 396-2 V1.1.1 (2006-09) 4 6.2.3.2.1 Overv
13、iew .21 6.2.3.2.2 Encoder and decoder .21 6.2.3.2.3 Modes of operation and frame size21 6.2.3.3 ITU-T Recommendation G.729 annex J (also known as G.729 EV) 21 6.2.3.4 L16 (ITU-T Recommendation H.245 Annex O).22 6.3 Wideband codec comparison22 7 Background noise transmission simulation22 7.1 General
14、description.22 7.2 Speech sequences .23 7.3 Noisy conditions.24 7.4 Noisy signal processing24 7.5 Network simulation 25 7.5.1 General description.25 7.5.2 Simulating network conditions .26 7.5.2.1 Delay and jitter emulation.27 7.5.2.2 Packet loss emulation27 7.5.3 Network conditions.28 7.5.3.1 Typic
15、al values of network conditions .28 7.6 Network simulation database .29 8 Speech sample database description and subjective scores production .29 8.1 Database description.29 8.2 Subjective scores collection .30 8.2.1 Requirements 30 8.2.2 Expert selection of samples for subjective testing 30 8.2.3 M
16、ethodology.31 8.2.4 STF 294 test results.32 9 Application of the material produced.35 9.1 Contribution of terminals and networks .35 9.2 Development of objective methods 36 Annex A (informative): Detailed STF 294 subjective test results.37 Annex B (informative): Complementary information on the prac
17、tical subjective test procedures 57 B.1 “Headphones“.57 B.2 Listening Levels .57 B.2.1 Mesaqin Laboratory .57 B.2.2 France Telecom Laboratory .57 B.2.3 Additional remarks.58 B.3 Sample Shortening / Extraction58 Annex C (informative): Instructions and Questions presented to listeners during subjectiv
18、e tests59 Annex D (informative): Bibliography.61 History 62 ETSI ETSI EG 202 396-2 V1.1.1 (2006-09) 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 a
19、vailable 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 s
20、erver (http:/webapp.etsi.org/IPR/home.asp). 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
21、 be, or may become, essential to the present document. Foreword This ETSI Guide (EG) has been produced by ETSI Technical Committee Speech Processing, Transmission and Quality Aspects (STQ). The present document is a deliverable of ETSI Specialized Task Force (STF) 294 entitled: “Improving the qualit
22、y of eEurope WideBand (WB) speech applications by developing a standardized performance testing and evaluation methodology for background noise transmission “. The present document is part 2 of a multi-part deliverable covering Speech Quality performance in the presence of background noise, as ident
23、ified below: Part 1: “Background noise simulation technique and background noise database“; Part 2: “Background noise transmission -Network simulation - Subjective test database and results“; Part 3: “Background noise transmission - Objective test methods“. ETSI ETSI EG 202 396-2 V1.1.1 (2006-09) 6
24、1 Scope The present document aims at setting up and verifying a transmission network simulation environment using realistic network scenarios for laboratory use in the context of background noise transmission in WideBand (WB) audio conversational applications. Background noise is a problem in mostly
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