1、 ETSI TS 1Universal Mobile TelCodec for EnhAdaptive Multibackwar(3GPP TS 26.4TECHNICAL SPECIFICATION126 446 V13.0.0 (2016elecommunications System (LTE; n anced Voice Services (EVS)lti-Rate - Wideband (AMR-WBard compatible functions .446 version 13.0.0 Release 1316-01) (UMTS); S); B) 13) ETSI ETSI TS
2、 126 446 V13.0.0 (2016-01)13GPP TS 26.446 version 13.0.0 Release 13Reference RTS/TSGS-0426446vd00 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 en
3、registre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present
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9、ETSI TS 126 446 V13.0.0 (2016-01)23GPP TS 26.446 version 13.0.0 Release 13Intellectual 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 available for ETSI members an
10、d 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 server (https:/ipr.etsi.org/)
11、. 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 be, or may become, essential to the prese
12、nt 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 identities or GSM identities. These should be interpreted as being refe
13、rences 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“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will no
14、t“, “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 citation. ETSI ETSI TS 126 446 V13.0.0 (2016-01)33GPP TS 26.446 ve
15、rsion 13.0.0 Release 13Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Abbreviations . 6g34 General . 6g35 AMR-WB backward compatible transcoding functions 7g36 AMR-WB backward compatible ANSI-C code . 7g37 AMR-WB backward
16、compatible error concealment of erroneous or lost frames 7g38 AMR-WB backward compatible comfort noise aspects 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 interfac
17、e to Iu, Uu, and Nb 7g3Annex A (informative): Change history . 8g3History 9g3ETSI ETSI TS 126 446 V13.0.0 (2016-01)43GPP TS 26.446 version 13.0.0 Release 13Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document ar
18、e subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify 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
19、first digit: 1 presented to TSG for information; 2 presented 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 incremente
20、d when editorial only changes have been incorporated in the document. ETSI ETSI TS 126 446 V13.0.0 (2016-01)53GPP TS 26.446 version 13.0.0 Release 131 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
21、functionality with reference to the Codec Detailed Algorithmic Description where the functionality is specified 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 (i
22、dentified by date of publication, 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
23、 reference implicitly refers to the latest version of that document in the same Release as the present document. 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
24、Enhanced Voice Services (EVS); ANSI C code (fixed-point)“. 4 3GPP TS 26.443: “ Codec for Enhanced Voice Services (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 Conc
25、ealment of Lost Packets“. 7 3GPP TS 26.448: “ Codec for Enhanced Voice Services (EVS); Jitter Buffer Management“. 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 Transmiss
26、ion (DTX)“. 10 3GPP TS 26.451: “ Codec for Enhanced Voice Services (EVS); Voice Activity Detection (VAD)“. 11 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
27、 - Wideband (AMR-WB) speech codec“. 13 3GPP TS 26.190: “Speech codec speech processing functions; Adaptive Multi-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 co
28、ncealment of erroneous or lost frames“. 15 3GPP TS 26.192: “Speech codec speech processing functions; Adaptive 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; Sou
29、rce controlled rate operation“. ETSI ETSI TS 126 446 V13.0.0 (2016-01)63GPP TS 26.446 version 13.0.0 Release 1317 3GPP TS 26.194: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Voice Activity Detector (VAD)“. 18 3GPP TS 26.201: “Speech codec speech p
30、rocessing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Frame structure“. 19 3GPP TS 26.202: “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;
31、 Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; ANSI-C code“. 21 IETF RFC 4867: “RTP Payload Format and 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 gi
32、ven in TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over 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
33、 Services FB Fullband IO InteroperableJBM Jitter Buffer Management NB Narrowband SID Silence Insertion Descriptor 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
34、to 23,85 kbit/s, including AMR-WB backward compatible DTX operation. This backward compatible operation is referred 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 generat
35、ed by an AMR-WB encoder can be decoded by an EVS AMR-WB IO decoder, without the need for transcoding. In addition 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
36、 17 and 20: - Support of input and output sampling frequencies other than 16 kHz (i.e. 8, 32, 48 kHz) - Inclusion 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 docu
37、ment is mandatory for implementation in all network entities and UEs supporting the EVS codec. In the case of 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
38、 case of discrepancy between the procedure described in the present document and its ANSI-C code specification contained in 4 the procedure defined by 4 prevails. ETSI ETSI TS 126 446 V13.0.0 (2016-01)73GPP TS 26.446 version 13.0.0 Release 135 AMR-WB backward compatible transcoding functions The AMR
39、-WB backward compatible transcoding functions of the EVS coder are described in 2. 6 AMR-WB backward compatible 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 arith
40、metic operation. 7 AMR-WB backward compatible error concealment of erroneous or lost frames The EVS coder AMR-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
41、aspects of EVS coder are described in 2. 9 AMR-WB backward compatible source controlled rate operation The EVS 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 compatibl
42、e Voice Activity Detector (VAD) The AMR-WB backward compatible VAD function of EVS coder is described in 2 and 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
43、 coder AMR-WB backward compatible part of the EVS coder supports the formats (IF1, IF2, MIME, RFC 4867 21) defined in 18 and 19. ETSI ETSI TS 126 446 V13.0.0 (2016-01)83GPP TS 26.446 version 13.0.0 Release 13Annex A (informative): Change history Change history Date TSG # TSG Doc. CR Rev Subject/Comm
44、ent 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 1.0.0 12.0.0 2015-12 70 Version for Release 13 12.0.0 13.0.0 ETSI ETSI TS 126 446 V13.0.0 (2016-01)93GPP TS 26.446 version 13.0.0 Release 13History Document history V13.0.0 January 2016 Publication
