1、 ETSI TS 126 077 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Minimum performance requirements for Noise Suppresser; Application to the Adaptive Multi-Rate (AMR) speech encoder (3GPP TS 26.077 version 15.0.0 Re
2、lease 15) TECHNICAL SPECIFICATION ETSI ETSI TS 126 077 V15.0.0 (2018-07)13GPP TS 26.077 version 15.0.0 Release 15Reference RTS/TSGS-0426077vf00 Keywords GSM,LTE,UMTS 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
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9、 logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS 126 077 V15.0.0 (2018-07)23GPP TS 26.077 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The inform
10、ation 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“, which is available from the E
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13、as being the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Spec
14、ification (TS) 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 identities. These should be interpreted as being references to the corresponding ETSI delivera
15、bles. 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 “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpre
16、ted 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 TS 126 077 V15.0.0 (2018-07)33GPP TS 26.077 version 15.0.0 Release 15Contents Intellect
17、ual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 6g31 Scope 7g32 References 7g33 Definitions and abbreviations . 8g33.1 Definitions 8g33.2 Abbreviations . 8g34 Description of Noise Suppression applied to AMR . 8g34.1 Applicability of Noise Suppression to Basic Services 8g35
18、 Requirements to be assessed by Objective Means . 8g35.1 Bit Exactness of the Speech Encoder . 8g35.2 Bit Exactness of the Speech Decoder . 9g35.3 Impact on Speech Path Delay . 9g35.4 Impact on Channel Activity 10g36 Requirements to be assessed by subjective tests 10g36.1 Impact on Speech Quality 10
19、g36.1.1 Initial Convergence Time . 10g36.1.2 No Degradation in Clean Speech 10g36.1.3 No degradation of Speech and no Undesirable Effects in Residual Noise in Conditions with Background Noise (residual noise = background noise after AMR/NS) 10g36.1.4 Quality Impact compared to AMR . 11g37 Performanc
20、e Objectives assessed by Objective Measures . 11g37.1 Impact on Active Speech Level 11g37.2 Objective Speech Quality Measures . 11g38 Interaction with supplementary services 12g38.1 General . 12g38.2 Explicit Call Transfer (ECT) 12g38.3 Call wait/Call hold 12g38.4 Multiparty . 12g38.5 Service Announ
21、cements . 12g39 Interaction with Alternate and Followed by services . 12g310 Interaction with other speech services 12g311 Interaction with DTMF and other signalling tones 12g312 Interaction with Lawful Intercept . 12g313 Interaction with TFO 12g3Annex A (informative): Method for generating Objectiv
22、e Performance Measures . 13g3A.1 Notations 13g3A.2 Test material . 14g3A.3 Objective measures for characterization of NS algorithm effect 14g3Annex B (normative): Methodology for Measuring Subjective SNR Improvement for CCR Experiments 18g3Annex C (normative): Test Plan for Checking Conformance to R
23、equirements . 19g3C.1 Introduction 19g3ETSI ETSI TS 126 077 V15.0.0 (2018-07)43GPP TS 26.077 version 15.0.0 Release 15C.2 Document Structure 19g3C.3 References, Conventions, and Contacts . 20g3C.4 Key Acronyms 20g3C.4.1 Contact Names . 20g3C.5 Roles and Responsibilities 21g3C.6 Information relevant
24、to all Experiments . 21g3C.6.1 General Technical Notes 21g3C.6.2 Codec Adaptation and Error Conditions 21g3C.6.3 Speech Material 21g3C.6.3.1 Availability of Pre-recorded Speech Material. 22g3C.6.3.2 Recording Your Own Speech Databases 22g3C.6.3.3 Format for Single Sentence Speech Samples 22g3C.6.3.4
25、 Format for Short Speech Samples . 22g3C.6.3.5 Format for Long Speech Samples . 23g3C.6.3.6 Processing of the Speech Files 23g3C.6.4 Listening Environment . 24g3C.6.5 Experimental Procedure . 24g3C.6.6 Preliminary Conditions . 25g3C.6.7 Reference Conditions . 25g3C.6.8 Noise Material 25g3C.7 Experim
26、ent 1: Degradation in Clean Speech (Pair Comparison Test) . 25g3C.7.1 Introduction 25g3C.7.2 Test Factors and Conditions . 26g3C.7.3 Preliminary Conditions . 26g3C.7.4 Speech Material 27g3C.7.5 Experimental Design 27g3C.7.6 Processing. 27g3C.7.7 Randomizations 27g3C.7.8 Duration of the PC Experiment
27、 27g3C.7.9 Votes Per Condition . 28g3C.7.10 Test Procedure 28g3C.7.11 Opinion Scale . 28g3C.7.12 Statistical Analysis . 28g3C.7.13 Test Conditions for Experiment 1 29g3C.8 Experiments 2a, 2b 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the sec
28、ond 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 TS 126 077 V15.0.0 (2018-07)73GPP TS 26.077 version 15.0.0 Release 151 Scope T
29、he present document specifies recommended minimum performance requirements for noise suppression algorithms intended for application in conjunction with the AMR speech encoder. This specification is for guidance purposes. Noise Suppression is intended to enhance the speech signal corrupted by acoust
30、ic noise at the input to the AMR speech encoder. The use of this recommended minimum performance requirements specification is not mandatory except for those solutions intended to be endorsed by SMG11. It is the intention of SMG11 to perform analysis and validation of any AMR noise suppression solut
31、ion which is voluntarily brought to the attention of SMG11 in the future, using the requirements set out in this specification to facilitate such an analysis. In order for SMG11 to endorse such a solution, SMG11 must confirm that all the recommended minimum performance requirements are met. 2 Refere
32、nces The following documents contain provisions which, through reference in this text, constitute 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 rev
33、isions do not apply. - For a non-specific reference, the latest version applies. In the case of 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 ITU-T Recommenda
34、tion I.130 (1988): “General modelling methods - Method for the characterisation of telecommunications services supported by an ISDN and network capabilities of an ISDN“. 2 3GPP TR 01.04 (ETR 350): “Abbreviations and acronyms“. 3 3GPP TS 06.71: “Adaptive Multi-Rate (AMR); Speech processing functions;
35、 General description“. 4 3GPP TS 06.77: “Minimum Performance Requirements for Noise Suppresser Application to the AMR Speech Encoder“. 5 3GPP TS 06.73: “Adaptive Multi Rate (AMR) speech; ANSI-C code for the AMR speech codec“. 6 3GPP TS 03.50: “Transmission planning aspects of the speech service in t
36、he GSM Public Land Mobile Network (PLMN) system“. 7 ITU-T Recommendation P.56: “Objective measurement of active speech level“. 8 ITU-T Recommendation P.800: “Methods for subjective determination of transmission quality“. 9 3GPP TR 06.75: “Performance Characterization of the GSM Adaptive Multi-Rate (
37、AMR) speech codec“. 10 3GPP TS 06.90: “Adaptive Multi-Rate (AMR) speech transcoding“. 11 3GPP TS 06.91: “Substitution and muting of lost frames for Adaptive Multi Rate (AMR) speech traffic channels“. 12 3GPP TS 06.92: “Comfort noise aspects for Adaptive Multi-Rate (AMR) speech traffic channels“. 13
38、3GPP TS 06.94: “Voice Activity Detection (VAD) for Adaptive Multi-Rate (AMR) speech traffic channels; General description“. ETSI ETSI TS 126 077 V15.0.0 (2018-07)83GPP TS 26.077 version 15.0.0 Release 153 Definitions and abbreviations 3GPP TR 01.04 2 provides a list of abbreviations and acronyms use
39、d in GSM specifications. For the purposes of the present document, the following definitions and abbreviations also apply: 3.1 Definitions None 3.2 Abbreviations AMR Adaptive Multi-Rate AMR/NS Combination of the AMR speech codec and the Noise Suppression function NS Noise Suppression 4 Description o
40、f Noise Suppression applied to AMR Noise Suppression for the AMR codec is a feature designed to enhance speech quality in a range of environments where there is significant (acoustic) background noise. The noise suppression function is a pre-processing module that is used to improve the signal to no
41、ise ratio of a speech signal prior to voice coding. In so doing it may use functions and/or data from the AMR speech encoding function. This specification defines recommended minimum performance requirements for such a function when it is implemented in the mobile station (operating on the uplink sp
42、eech signal). The AMR Speech decoder should not be altered by the Noise Suppression function. It shall be possible to disable the operation of the noise suppression algorithm using signalling when commanded by the network. 4.1 Applicability of Noise Suppression to Basic Services. This feature shall
43、be applicable (as an option) to all speech calls where the narrowband AMR codec is utilised. Provision of the feature in AMR-capable mobile stations is a manufacturer dependent option. The network shall be able to enable or disable this noise suppression function both at call set-up and in call. Sig
44、nalling between network and mobile to allow this control has been provided. 5 Requirements to be assessed by Objective Means 5.1 Bit Exactness of the Speech Encoder The Noise Suppression shall be implemented as a separate pre-processing module prior to the speech encoding. The functionality and all
45、internal states, tables and variables of the speech encoder shall remain unaltered by the Noise Suppression function. The Noise Suppression should be implemented as a stand-alone pre-processing module operating on the 160 samples input speech buffer to the speech encoder according to Figure 1. ETSI
46、ETSI TS 126 077 V15.0.0 (2018-07)93GPP TS 26.077 version 15.0.0 Release 15Figure 1: Noise Suppression implementation Alternatively, for implementation in conjunction with the bit-exact fixed point C reference code 3GPP TS 06.73 5 the NS module may operate on the pre-processed input speech buffer “ol
47、d_speechL_TOTAL“ in the structure “cod_amrState“ in the AMR C code 3GPP TS 06.73 after the pre-processing module (sample down-scaling and input high pass filtering) of the speech encoder. The bit-integrity of the speech encoder for this implementation shall be verified according to Figure 2 where th
48、e signals at Test Points 1 and 2 shall be identical for any input signal and the Reference Encoder is the part of 3GPP TS 06.73 after the pre-processing module. Note: implementation in conjunction with the AMR floating point C code is for further study. Figure 2: Verification of AMR speech encoder b
49、it-exactness for embedded NS implementations 5.2 Bit Exactness of the Speech Decoder The AMR speech decoder shall remain unaltered by the Noise Suppression function. 5.3 Impact on Speech Path Delay The one way algorithmic delay due to the activation of AMR noise suppression shall be no more than 5ms in excess of the delay inserted by the AMR speech codec. In the handsfree case, this delay is part of the 39ms delay specified in 3GPP TS 03.50 6. The total additional delay (comprising of algorithmic and processing delays) shall not exceed
