1、 ETSI TS 1Universal Mobile TelCodec for EnhDiscontinu(3GPP TS 26.4TECHNICAL SPECIFICATION126 450 V13.0.0 (2016elecommunications System (LTE; n anced Voice Services (EVS)inuous Transmission (DTX) .450 version 13.0.0 Release 1316-01) (UMTS); S); 13) ETSI ETSI TS 126 450 V13.0.0 (2016-01)13GPP TS 26.45
2、0 version 13.0.0 Release 13Reference RTS/TSGS-0426450vd00 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
3、) 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 document shall not be modified without t
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9、S 26.450 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
10、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/). Pursuant to the ETSI IPR Policy, no in
11、vestigation, 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 Spe
12、cification (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 deliver
13、ables. 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 interpr
14、eted 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 126 450 V13.0.0 (2016-01)33GPP TS 26.450 version 13.0.0 Release 13Contents Intellec
15、tual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Abbreviations . 5g34 General . 6g34.1 Background 6g34.2 General organization 6g35 EVS Codec DTX Operation . 7g35.1 Transmit (TX) side . 7g35.2 Receive (RX) side 7g3Annex A (informative): Chang
16、e history . 8g3History 9g3ETSI ETSI TS 126 450 V13.0.0 (2016-01)43GPP TS 26.450 version 13.0.0 Release 13Foreword 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
17、 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 digit: 1 presented to TSG for information; 2
18、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 editorial only changes have been incorporate
19、d in the document. ETSI ETSI TS 126 450 V13.0.0 (2016-01)53GPP TS 26.450 version 13.0.0 Release 131 Scope This document specifies the system level aspects of the Discontinuous Transmission (DTX) function of the EVS codec. 2 References The following documents contain provisions which, through referen
20、ce 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 reference, subsequent revisions do not apply. - For a non-specific reference, the latest versio
21、n 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 document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 26.445: “Codec for Enh
22、anced Voice Services (EVS); 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 Services (EVS); ANSI C code (floating-point)“. 5 3GPP TS 26.444: “ Codec for Enhanced Voice Services (
23、EVS); Test Sequences“. 6 3GPP TS 26.446: “ Codec for Enhanced Voice Services (EVS); AMR-WB Backward Compatible Functions“. 7 3GPP TS 26.447: “ Codec for Enhanced Voice Services (EVS); Error Concealment of Lost Packets“. 8 3GPP TS 26.448: “ Codec for Enhanced Voice Services (EVS); Jitter Buffer Manag
24、ement“. 9 3GPP TS 26.449: “ Codec for Enhanced Voice Services (EVS); Comfort Noise Generation (CNG) Aspects“. 10 3GPP TS 26.441: “ Codec for Enhanced Voice Services (EVS); General Overview“. 11 3GPP TS 26.451: “ Codec for Enhanced Voice Services (EVS); Voice Activity Detection (VAD)“. 12 3GPP TS 26.
25、114: “Multimedia Telephony; Media handling and interaction“. 13 3GPP TS 26.131: “Terminal acoustic characteristics for telephony; Requirements “. 14 3GPP TR 26.952: Codec for Enhanced Voice Services (EVS); Performance Characterization. 3 Abbreviations For the purposes of the present document, the ab
26、breviations given 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. ACELP Algebraic Code-Excited Linear Prediction AMR-WB Adaptive Multi Rate Wideband (codec) ETSI ETSI TS 126
27、 450 V13.0.0 (2016-01)63GPP TS 26.450 version 13.0.0 Release 13CNG Comfort Noise Generator DTX Discontinuous Transmission EVS Enhanced Voice Services FB Fullband FEC Frame Erasure Concealment IP Internet Protocol JBM Jitter Buffer Management MSB Most Significant Bit MTSI Multimedia Telephony Service
28、 for IMS NB Narrowband PS Packet SwitchedPSTN Public Switched Telephone Network SAD 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 G
29、eneral 4.1 Background The present document specifies the system level aspects of the Discontinuous Transmission (DTX) function of the EVS codec. Specific codec functions that implement the DTX functionality are described in TS 26.445 2. Discontinuous transmission (DTX) is a mechanism for the EVS Cod
30、ec to encode the input signal at a lower average rate by taking speech inactivity into account. The DTX scheme is useful for the following purposes: - to conserve UE power, - to improve network capacity. DTX in the transmitting path (uplink) shall be in operation in UEs if commanded so by the networ
31、k. The UE shall handle DTX in the receiving path (downlink) at any time, regardless of whether DTX in the transmitting path is commanded or not. 4.2 General organization The default DTX mechanism described in the present document requires the following functions: - a Signal Activity Detector (SAD) o
32、n the transmit (TX) side; - evaluation of the background acoustic noise on the transmit (TX) side in order to transmit characteristic parameters to the receive (RX) side; - generation, on the receive (RX) side, of a similar noise called comfort noise during periods where the transmission is switched
33、 off. The Signal Activity Detector (SAD) is defined in TS 26.451 11 and the comfort noise functions in TS 26.449 9. Both are based partly on the EVS Codec and its internal variables defined in TS 26.445 2. In addition to these functions, if the parameters arriving at the RX side are detected to be s
34、eriously corrupted by errors, the speech or comfort noise shall be generated from substituted data in order to avoid seriously annoying effects for the listener. These functions are defined in TS 26.447 7. An overall description of the speech processing parts can be found in TS 26.441 10. An overvie
35、w of the DTX operation is shown in Figure 1. ETSI ETSI TS 126 450 V13.0.0 (2016-01)73GPP TS 26.450 version 13.0.0 Release 13Figure 1: Block diagram of DTX Operation 5 EVS Codec DTX Operation 5.1 Transmit (TX) side There are two algorithms for extending the DTX hangover period. One is a general hango
36、ver algorithm and other is specific to music. Both are defined in clause 5.1.12.5 of TS 26.445 2. The main specification of the DTX/CNG algorithms is contained in clause 5.6 of TS 26.445 2. The bit allocation of SID frames generated for DTX operation is defined in clause 7.2 of TS 26.445 2. 5.2 Rece
37、ive (RX) side Operation of the EVS decoder, including decoding of SID frames generated during DTX operation is described in clause 6.7 of TS 26.445 2. ETSI ETSI TS 126 450 V13.0.0 (2016-01)83GPP TS 26.450 version 13.0.0 Release 13Annex A (informative): Change history Change history Date TSG # TSG Do
38、c. CR Rev Subject/Comment Old New 2014-09 65 SP-140465 Presented at TSG#65 for approval 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 126 450 V13.0.0 (2016-01)93GPP TS 26.450 version 13.0.0 Release 13History Document history V13.0.0 January 2016 Publication
