1、 ETSI TS 126 077 V14.0.0 (2017-04) 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 14.0.0 Re
2、lease 14) floppy3TECHNICAL SPECIFICATION ETSI ETSI TS 126 077 V14.0.0 (2017-04)13GPP TS 26.077 version 14.0.0 Release 14Reference RTS/TSGS-0426077ve00 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
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8、tandards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered 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
9、 are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 126 077 V14.0.0 (2017-04)23GPP TS 26.077 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to thes
10、e 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 ETSI Secretariat. Latest
11、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 referenced in ETSI SR 000 314 (or the updates on the ETSI Web
12、server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (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 iden
13、tities or GSM identities. 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 “shall“, “shal
14、l 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 “must not“ are NOT allowed in ETSI deliverables except when used in direct
15、 citation. ETSI ETSI TS 126 077 V14.0.0 (2017-04)33GPP TS 26.077 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 6g31 Scope 7g32 References 7g33 Definitions and abbreviations . 8g33.1 Definitions 8g33.2 Abbreviations . 8g34 Descri
16、ption of Noise Suppression applied to AMR . 8g34.1 Applicability of Noise Suppression to Basic Services 8g35 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 o
17、n Channel Activity 10g36 Requirements to be assessed by subjective tests 10g36.1 Impact on Speech Quality 10g36.1.1 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
18、(residual noise = background noise after AMR/NS) 10g36.1.4 Quality Impact compared to AMR . 11g37 Performance 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 .
19、12g38.2 Explicit Call Transfer (ECT) 12g38.3 Call wait/Call hold 12g38.4 Multiparty . 12g38.5 Service Announcements . 12g39 Interaction with Alternate and Followed by services . 12g310 Interaction with other speech services 12g311 Interaction with DTMF and other signalling tones 13g312 Interaction w
20、ith Lawful Intercept . 13g313 Interaction with TFO 13g3Annex A (informative): Method for generating Objective Performance Measures . 14g3A.1 Notations 14g3A.2 Test material . 15g3A.3 Objective measures for characterization of NS algorithm effect 15g3Annex B (normative): Methodology for Measuring Sub
21、jective SNR Improvement for CCR Experiments 19g3Annex C (normative): Test Plan for Checking Conformance to Requirements 20g3ETSI ETSI TS 126 077 V14.0.0 (2017-04)43GPP TS 26.077 version 14.0.0 Release 14C.1 Introduction 20g3C.2 Document Structure 20g3C.3 References, Conventions, and Contacts . 21g3C
22、.4 Key Acronyms 21g3C.4.1 Contact Names . 21g3C.5 Roles and Responsibilities 22g3C.6 Information relevant to all Experiments . 22g3C.6.1 General Technical Notes 22g3C.6.2 Codec Adaptation and Error Conditions 22g3C.6.3 Speech Material 22g3C.6.3.1 Availability of Pre-recorded Speech Material. 23g3C.6
23、.3.2 Recording Your Own Speech Databases 23g3C.6.3.3 Format for Single Sentence Speech Samples 23g3C.6.3.4 Format for Short Speech Samples . 24g3C.6.3.5 Format for Long Speech Samples . 24g3C.6.3.6 Processing of the Speech Files 24g3C.6.4 Listening Environment . 25g3C.6.5 Experimental Procedure . 25
24、g3C.6.6 Preliminary Conditions . 26g3C.6.7 Reference Conditions . 26g3C.6.8 Noise Material 26g3C.7 Experiment 1: Degradation in Clean Speech (Pair Comparison Test) . 26g3C.7.1 Introduction 26g3C.7.2 Test Factors and Conditions . 27g3C.7.3 Preliminary Conditions . 28g3C.7.4 Speech Material 28g3C.7.5
25、Experimental Design 28g3C.7.6 Processing. 28g3C.7.7 Randomizations 28g3C.7.8 Duration of the PC Experiment 29g3C.7.9 Votes Per Condition . 29g3C.7.10 Test Procedure 29g3C.7.11 Opinion Scale . 29g3C.7.12 Statistical Analysis . 29g3C.7.13 Test Conditions for Experiment 1 30g3C.8 Experiments 2a, 2b 2 p
26、resented to TSG for approval; 3 or greater indicates TSG approved document under change 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
27、 in the document. ETSI ETSI TS 126 077 V14.0.0 (2017-04)73GPP TS 26.077 version 14.0.0 Release 141 Scope The present document specifies recommended minimum performance requirements for noise suppression algorithms intended for application in conjunction with the AMR speech encoder. This specificatio
28、n is for guidance purposes. Noise Suppression is intended to enhance the speech signal corrupted by acoustic 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
29、 SMG11. It is the intention of SMG11 to perform analysis and validation of any AMR noise suppression solution 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
30、a solution, SMG11 must confirm that all the recommended minimum performance requirements are met. 2 References 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 public
31、ation, 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 a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to
32、 the latest version of that document in the same Release as the present document. 1 ITU-T Recommendation 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): “Ab
33、breviations and acronyms“. 3 3GPP TS 06.71: “Adaptive Multi-Rate (AMR); Speech processing functions; 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 f
34、or the AMR speech codec“. 6 3GPP TS 03.50: “Transmission planning aspects of the speech service in the 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 tr
35、ansmission quality“. 9 3GPP TR 06.75: “Performance Characterization of the GSM Adaptive Multi-Rate (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“.
36、12 3GPP TS 06.92: “Comfort noise aspects for Adaptive Multi-Rate (AMR) speech traffic channels“. 13 3GPP TS 06.94: “Voice Activity Detection (VAD) for Adaptive Multi-Rate (AMR) speech traffic channels; General description“. ETSI ETSI TS 126 077 V14.0.0 (2017-04)83GPP TS 26.077 version 14.0.0 Release
37、 143 Definitions and abbreviations 3GPP TR 01.04 2 provides a list of abbreviations and acronyms used 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 Combina
38、tion of the AMR speech codec and the Noise Suppression function NS Noise Suppression 4 Description of 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
39、. The noise suppression function is a pre-processing module that is used to improve the signal to noise 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 requi
40、rements for such a function when it is implemented in the mobile station (operating on the uplink speech 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 com
41、manded by the network. 4.1 Applicability of Noise Suppression to Basic Services. This feature shall 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 sha
42、ll be able to enable or disable this noise suppression function both at call set-up and in call. Signalling 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 impl
43、emented as a separate pre-processing module prior to the speech encoding. The functionality and all 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
44、 operating on the 160 samples input speech buffer to the speech encoder according to Figure 1. ETSI ETSI TS 126 077 V14.0.0 (2017-04)93GPP TS 26.077 version 14.0.0 Release 14Figure 1: Noise Suppression implementation Alternatively, for implementation in conjunction with the bit-exact fixed point C r
45、eference code 3GPP TS 06.73 5 the NS module may operate on the pre-processed input speech buffer “old_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-inte
46、grity of the speech encoder for this implementation shall be verified according to Figure 2 where the 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 wit
47、h the AMR floating point C code is for further study. Figure 2: Verification of AMR speech encoder bit-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 Th
48、e 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 algorithmi
49、c and processing delays) shall not exceed 10ms. The processing delay is calculated using the following formula with E*S*P set to 50. delay(proc) = WMOPS20/(ESP) NS processedspeech bufferInput speech bufferNSCoded bit streamSpeechEncoderNS processed“old_speechL_TOTAL”Coded bit stream“old_speechL_TOTAL”InputspeechbufferPre-processing(scaling andfiltering)NS SpeechEncoder(rest of)Test Point 2Test Point 1Store ReferenceEncoderETSI ETSI TS 126 077 V14.0.0 (2017-04)103GPP TS 26.077 version 14.0.0 Release 14where WMOPS = complexit
