1、 ETSI TS 1Universal Mobile TelCodec for EnhVoice Ac(3GPP TS 26.4TECHNICAL SPECIFICATION126 451 V13.0.0 (2016elecommunications System (LTE; n anced Voice Services (EVS)A tivity Detection (VAD) .451 version 13.0.0 Release 1316-01) (UMTS); S); 13) ETSI ETSI TS 126 451 V13.0.0 (2016-01)13GPP TS 26.451 v
2、ersion 13.0.0 Release 13Reference RTS/TSGS-0426451vd00 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-Prfecture de Grasse (06) N
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9、6.451 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 and non-members, and can be found in ETSI SR
10、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/). Pursuant to the ETSI IPR Policy, no inves
11、tigation, 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 present document. Foreword This Technical Specif
12、ication (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 deliverabl
13、es. 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 interprete
14、d 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 126 451 V13.0.0 (2016-01)33GPP TS 26.451 version 13.0.0 Release 13Contents Intellectua
15、l Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Abbreviations . 5g34 General . 6g35 The SAD Algorithm . 6g3Annex A (informative): Change history . 7g3History 8g3ETSI ETSI TS 126 451 V13.0.0 (2016-01)43GPP TS 26.451 version 13.0.0 Release 13For
16、eword 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 modify the contents of the present document, it will b
17、e 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 approved document under change control. y the seco
18、nd 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 126 451 V13.0.0 (2016-01)53GPP TS 26.451 version 13.0.0 Release 131 Scope Th
19、e present document specifies the Voice Activity Detector (VAD) used in the Discontinuous Transmission (DTX) of the EVS Codec. Although the main application of the VAD algorithm is the detection of speech or voice signals, the algorithm is more accurately described as a Signal Activity Detection (SAD
20、) algorithm. The present document is a high level overview of the 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 provi
21、sions 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 revisions do not apply. - For a non-specific reference, the latest version applies. In the case of a refer
22、ence 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 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 26.441: “Codec for Enhanced Voice Services (EVS); Gener
23、al Overview“. 3 3GPP TS 26.445: “Codec for Enhanced Voice Services (EVS); Detailed Algorithmic Description “. 4 3GPP TS 26.442: “Codec for Enhanced Voice Services (EVS); ANSI C code (fixed-point)“. 5 3GPP TS 26.443: “Codec for Enhanced Voice Services (EVS); ANSI C code (floating-point)“. 6 3GPP TS 2
24、6.444: “Codec for Enhanced Voice Services (EVS); Test Sequences“. 7 3GPP TS 26.446: “Codec for Enhanced Voice Services (EVS); AMR-WB Backward Compatible Functions“. 8 3GPP TS 26.449: “Codec for Enhanced Voice Services (EVS); Comfort Noise Generation (CNG) Aspects“. 9 3GPP TS 26.450: “Codec for Enhan
25、ced Voice Services (EVS); Discontinuous Transmission (DTX)“. 10 3GPP TR 26.952: “Codec for Enhanced Voice Services (EVS); Performance Characterization“. 3 Abbreviations For the purposes of the present document, the abbreviations given in TR 21.905 1 and the following apply. An abbreviation defined i
26、n the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 1. ACELP Algebraic Code-Excited Linear Prediction AMR-WB Adaptive Multi Rate Wideband (codec) CNG Comfort Noise Generator DTX Discontinuous Transmission EVS Enhanced Voice Services FB Fullband
27、ETSI ETSI TS 126 451 V13.0.0 (2016-01)63GPP TS 26.451 version 13.0.0 Release 13FEC Frame Erasure Concealment IP Internet Protocol JBM Jitter Buffer Management MSB Most Significant Bit MTSI Multimedia Telephony Service for IMS NB Narrowband PS Packet SwitchedPSTN Public Switched Telephone Network SAD
28、 Signal Activity Detection SC-VBR Source Controlled - Variable Bit Rate SID Silence Insertion Descriptor SWB Super Wideband VAD Voice Activity Detection WB Wideband WMOPS Weighted Millions of Operations Per Second 4 General The function of the Enhanced Voice Services coder VAD algorithm, or more acc
29、urately the SAD algorithm, is to indicate whether each 20 ms frame contains signals that should be transmitted, e.g. speech, music or other audio. The output of the SAD algorithm is a Boolean flag ( ) that is set to one for the active signal, which is any useful signal bearing some meaningful inform
30、ation. Otherwise, the flag is set to zero indicating an inactive signal, which has no meaningful information. The inactive signal is mostly a pause or background noise. The procedure of the present document is mandatory for implementation in all network entities and User Equipment (UE)s supporting t
31、he EVS coder. The present document does not describe the ANSI-C code of this procedure. In the case of discrepancy between the procedure described in the present document and its ANSI-C code specifications contained in 4 the procedure defined by the 4 prevails. 5 The SAD Algorithm The Enhanced Voice
32、 Services codec signal activity detection (SAD) module described in the present document consists of three sub-SAD modules; SAD1, SAD2 and SAD3. SAD1 and SAD2 are combined initially to provide an efficient preliminary activity decision. This preliminary decision is then modified by the third sub-SAD
33、 module, SAD3, depending upon the codec mode of operation. The efficient preliminary activity output is used as the final SAD decision for the AMR-WB IO modes, while the activity output with SAD3 is used as the final SAD decision for all other bit-rates. Sub-clause 5.1.12 in 3 describes the operatio
34、n of the SAD and the algorithms involved in the three sub-SAD modules in detail. SADfETSI ETSI TS 126 451 V13.0.0 (2016-01)73GPP TS 26.451 version 13.0.0 Release 13Annex A (informative): Change history Change history Date TSG # TSG Doc. CR Rev Subject/Comment Old New 2014-09 65 SP-140466 Presented at TSG-SA #65 for approval 1.0.0 2014-09 65 Approved at TSG SA65 1.0.0 12.0.0 2015-12 70 Version for Release 13 12.0.0 13.0.0 ETSI ETSI TS 126 451 V13.0.0 (2016-01)83GPP TS 26.451 version 13.0.0 Release 13History Document history V13.0.0 January 2016 Publication
