1、 ETSI TS 126 446 V14.0.0 (2017-04) 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 14.0.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 126 446 V14.0.0 (2
2、017-04)13GPP TS 26.446 version 14.0.0 Release 14Reference RTS/TSGS-0426446ve00 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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12、nt. 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 references to
13、 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 not“, “can“
14、 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 V14.0.0 (2017-04)33GPP TS 26.446 version 14.
15、0.0 Release 14Contents 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 compatibl
16、e 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 interface to Iu,
17、Uu, and Nb 7g3Annex A (informative): Change history . 8g3History 9g3ETSI ETSI TS 126 446 V14.0.0 (2017-04)43GPP TS 26.446 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject
18、 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 first dig
19、it: 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 incremented when ed
20、itorial only changes have been incorporated in the document. ETSI ETSI TS 126 446 V14.0.0 (2017-04)53GPP TS 26.446 version 14.0.0 Release 141 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 functiona
21、lity 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 (identified
22、 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 referenc
23、e 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 Enhanced
24、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 Concealment o
25、f 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 Transmission (DTX)
26、“. 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 - Wideba
27、nd (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 concealment
28、 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; Source contr
29、olled rate operation“. ETSI ETSI TS 126 446 V14.0.0 (2017-04)63GPP TS 26.446 version 14.0.0 Release 1417 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 processing
30、 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; Adaptive
31、 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 given in TR
32、 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 Services
33、 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 to 23,85
34、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 generated by an
35、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 17 and 2
36、0: - 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 document is m
37、andatory 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 case of
38、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 V14.0.0 (2017-04)73GPP TS 26.446 version 14.0.0 Release 145 AMR-WB backward compatible transcoding functions The AMR-WB backw
39、ard 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 arithmetic ope
40、ration. 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 aspects o
41、f 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 compatible Voice A
42、ctivity 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 coder AM
43、R-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 V14.0.0 (2017-04)83GPP TS 26.446 version 14.0.0 Release 14Annex A (informative): Change history Change history Date TSG # TSG Doc. CR Rev Subject/Comment Old N
44、ew 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 Change history Date Meeting TDoc CR Rev Cat Subject/Comment New version 2017-03 75 Version for Release 14 14.0.0 ETSI ETSI TS 126 446 V14.0.0 (2017-04)93GPP TS 26.446 version 14.0.0 Release 14History Document history V14.0.0 April 2017 Publication
