1、 ETSI TS 126 446 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); LTE; Codec for Enhanced Voice Services (EVS); Adaptive Multi-Rate - Wideband (AMR-WB) backward compatible functions (3GPP TS 26.446 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 126 446 V15.0.0 (2
2、018-07)13GPP TS 26.446 version 15.0.0 Release 15Reference RTS/TSGS-0426446vf00 Keywords 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 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Pr
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9、I ETSI TS 126 446 V15.0.0 (2018-07)23GPP TS 26.446 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 information pertaining to these essential IPRs, if any, is publicly availab
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13、ce 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 Specification (TS) has been produced by ETSI 3rd Generation Partnership P
14、roject (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 deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities
15、 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 interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal for
16、ms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 126 446 V15.0.0 (2018-07)33GPP TS 26.446 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Forew
17、ord . 4g31 Scope 5g32 References 5g33 Abbreviations . 6g34 General . 6g35 AMR-WB backward compatible transcoding functions 6g36 AMR-WB backward compatible ANSI-C code . 7g37 AMR-WB backward compatible error concealment of erroneous or lost frames 7g38 AMR-WB backward compatible comfort noise aspects
18、 7g39 AMR-WB backward compatible source controlled rate operation 7g310 AMR-WB backward compatible Voice Activity Detector (VAD) 7g311 AMR-WB backward compatible frame structure and interface to Iu, Uu, and Nb 7g3Annex A (informative): Change history . 8g3History 9g3ETSI ETSI TS 126 446 V15.0.0 (201
19、8-07)43GPP TS 26.446 version 15.0.0 Release 15Foreword This Technical Specification 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 modif
20、y the contents of the present 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 a
21、pproved 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 in the document. ETSI ETSI TS 126 446 V15.0.0 (2018-07)53
22、GPP TS 26.446 version 15.0.0 Release 151 Scope The present document specifies the AMR-WB backward compatible functions of the EVS codec. The present document is a high level overview of the functionality with reference to the Codec Detailed Algorithmic Description where the functionality is specifie
23、d in detail. 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 publication, edition number, version number, etc.) or non-specific. - For a specific refe
24、rence, 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 the latest version of that document in the same Release as the present documen
25、t. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 26.445: “Codec for Enhanced Voice Services (EVS); Codec Detailed Algorithmic Description“. 3 3GPP TS 26.442: “ Codec for Enhanced Voice Services (EVS); ANSI C code (fixed-point)“. 4 3GPP TS 26.443: “ Codec for Enhanced Voice Servic
26、es (EVS); ANSI C code (floating-point)“. 5 3GPP TS 26.444: “ Codec for Enhanced Voice Services (EVS); Test Sequences“. 6 3GPP TS 26.447: “ Codec for Enhanced Voice Services (EVS); Error Concealment of Lost Packets“. 7 3GPP TS 26.448: “ Codec for Enhanced Voice Services (EVS); Jitter Buffer Managemen
27、t“. 8 3GPP TS 26.449: “ Codec for Enhanced Voice Services (EVS); Comfort Noise Generation (CNG) Aspects“. 9 3GPP TS 26.450: “ Codec for Enhanced Voice Services (EVS); Discontinuous Transmission (DTX)“. 10 3GPP TS 26.451: “ Codec for Enhanced Voice Services (EVS); Voice Activity Detection (VAD)“. 11
28、3GPP TS 26.171: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; General description“. 12 3GPP TS 26.173: “ANSI-C code for Adaptive Multi-Rate - Wideband (AMR-WB) speech codec“. 13 3GPP TS 26.190: “Speech codec speech processing functions; Adaptive Mul
29、ti-Rate - Wideband (AMR-WB) speech codec; Transcoding functions“. 14 3GPP TS 26.191: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Error concealment of erroneous or lost frames“. 15 3GPP TS 26.192: “Speech codec speech processing functions; Adaptive
30、 Multi-Rate - Wideband (AMR-WB) speech codec; Comfort noise aspects “. 16 3GPP TS 26.193: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Source controlled rate operation“. 17 3GPP TS 26.194: “Speech codec speech processing functions; Adaptive Multi-R
31、ate - Wideband (AMR-WB) speech codec; Voice Activity Detector (VAD)“. ETSI ETSI TS 126 446 V15.0.0 (2018-07)63GPP TS 26.446 version 15.0.0 Release 1518 3GPP TS 26.201: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Frame structure“. 19 3GPP TS 26.202
32、: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Interface to Iu, Uu, and Nb“. 20 3GPP TS 26.204: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; ANSI-C code“. 21 IETF RFC 4867: “RTP Payload Format and
33、 File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs“. 3 Abbreviations For the purposes of the present document, the abbreviations given in TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence o
34、ver the definition of the same abbreviation, if any, in TR 21.905 1. AMR-WB Adaptive Multi Rate Wideband (codec) CNG Comfort Noise Generator DTX Discontinuous Transmission EVS Enhanced Voice Services FB Fullband IO InteroperableJBM Jitter Buffer Management NB Narrowband SID Silence Insertion Descrip
35、tor SWB Super Wideband VAD Voice Activity Detection WB Wideband 4 General The EVS coder provides enhanced AMR-WB backward compatible operation over all nine source bit rates from 6.6 kbit/s to 23,85 kbit/s, including AMR-WB backward compatible DTX operation. This backward compatible operation is ref
36、erred to AMR-WB interoperable (AMR-WB IO). Frames generated by an EVS AMR-WB IO encoder can be decoded by an AMR-WB decoder, without the need for transcoding. Correspondingly, frames generated by an AMR-WB encoder can be decoded by an EVS AMR-WB IO decoder, without the need for transcoding. In addit
37、ion to encoder and decoder enhancements, the AMR-WB backward compatible functions in the EVS coder provide the following extra functionalities compared to the AMR-WB coder specified in 11 to 17 and 20: - Support of input and output sampling frequencies other than 16 kHz (i.e. 8, 32, 48 kHz) - Inclus
38、ion of jitter buffer management for AMR-WB backward compatible functions - Switching between AMR-WB IO bit rates and primary EVS bit rates at any 20 ms speech frame boundary The present document is mandatory for implementation in all network entities and UEs supporting the EVS codec. In the case of
39、discrepancy between the EVS codec backward compatible functions described in the present document and its ANSI-C code specification contained in 3 the procedure defined by 3 prevails. In the case of discrepancy between the procedure described in the present document and its ANSI-C code specification
40、 contained in 4 the procedure defined by 4 prevails. 5 AMR-WB backward compatible transcoding functions The AMR-WB backward compatible transcoding functions of the EVS coder are described in 2. ETSI ETSI TS 126 446 V15.0.0 (2018-07)73GPP TS 26.446 version 15.0.0 Release 156 AMR-WB backward compatibl
41、e ANSI-C code The ANSI C-code of the EVS codec, including backward compatible functions, is described in 3 for fixed point arithmetic operation and is described in 4 for floating point arithmetic operation. 7 AMR-WB backward compatible error concealment of erroneous or lost frames The EVS coder AMR-
42、WB backward compatible error concealment of erroneous or lost frames is described in 2 and 7. 8 AMR-WB backward compatible comfort noise aspects The AMR-WB backward compatible comfort noise aspects of EVS coder are described in 2. 9 AMR-WB backward compatible source controlled rate operation The EVS
43、 coder AMR-WB backward compatible source controlled rate operation of the Enhanced Voice Services codec is defined in 2. This DTX operation is compliant with 16. 10 AMR-WB backward compatible Voice Activity Detector (VAD) The AMR-WB backward compatible VAD function of EVS coder is described in 2 and
44、 10. The VAD algorithm description is detailed in 2, and the corresponding C-code is defined in 3 and 4. 11 AMR-WB backward compatible frame structure and interface to Iu, Uu, and Nb The EVS coder AMR-WB backward compatible part of the EVS coder supports the formats (IF1, IF2, MIME, RFC 4867 21) def
45、ined in 18 and 19. ETSI ETSI TS 126 446 V15.0.0 (2018-07)83GPP TS 26.446 version 15.0.0 Release 15Annex A (informative): Change history Change history Date TSG # TSG Doc. CR Rev Subject/Comment Old New 2014-09 65 SP-140461 Presented at TSG SA#65 for approvaal 1.0.0 2014-09 65 Approved at TSG SA#65 1
46、.0.0 12.0.0 2015-12 70 Version for Release 13 12.0.0 13.0.0 Change history Date Meeting TDoc CR Rev Cat Subject/Comment New version 2017-03 75 Version for Release 14 14.0.0 2018-06 80 Version for Release 15 15.0.0 ETSI ETSI TS 126 446 V15.0.0 (2018-07)93GPP TS 26.446 version 15.0.0 Release 15History Document history V15.0.0 July 2018 Publication
