1、 ETSI TS 126 201 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Frame structure (3GPP TS 26.201 version 15.0.0 Relea
2、se 15) TECHNICAL SPECIFICATION ETSI ETSI TS 126 201 V15.0.0 (2018-07)13GPP TS 26.201 version 15.0.0 Release 15Reference RTS/TSGS-0426201vf00 Keywords GSM,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 00
3、017 - NAF 742 C Association but non lucratif enregistre 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 e
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9、go are trademarks registered and owned by the GSM Association. ETSI ETSI TS 126 201 V15.0.0 (2018-07)23GPP TS 26.201 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 informati
10、on pertaining to these essential IPRs, if any, is publicly available for ETSI members and 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
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13、being the property of ETSI, and conveys no right to use or reproduce 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 Specifi
14、cation (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 deliverable
15、s. 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 interpreted
16、 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 126 201 V15.0.0 (2018-07)33GPP TS 26.201 version 15.0.0 Release 15Contents Intellectual
17、 Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and Abbreviations 5g33.1 Definitions 5g33.2 Abbreviations . 5g34 AMR-WB codec Interface format 1 (AMR-WB IF1) . 6g34.1 AMR-WB Header and AMR-WB Auxiliary Information 6g34.1.1 Frame Typ
18、e, Mode Indication, and Mode Request . 6g34.1.2 Frame Quality Indicator 7g34.1.3 Mapping to TX_TYPE and RX_TYPE 7g34.1.4 Codec CRC . 8g34.2 AMR-WB Core Frame . 8g34.2.1 AMR-WB Core Frame with speech bits: Bit ordering 8g34.2.2 AMR-WB Core Frame with speech bits: Class division 8g34.2.3 AMR-WB Core F
19、rame with comfort noise bits 9g34.3 Generic AMR-WB Frame Composition . 10g3Annex A (normative): AMR-WB Interface Format 2 (with octet alignment) 12g3Annex B (normative): Tables for AMR-WB Core Frame bit ordering 14g3Annex C (informative): Change history . 22g3History 23g3ETSI ETSI TS 126 201 V15.0.0
20、 (2018-07)43GPP TS 26.201 version 15.0.0 Release 15Foreword This Technical Specification (TS) 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
21、 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 presented to TSG for approval; 3 or greater indic
22、ates 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 incorporated in the document. ETSI ETSI TS 126 201 V15.0.0 (
23、2018-07)53GPP TS 26.201 version 15.0.0 Release 151 Scope The present document describes a generic frame format for the Adaptive Multi-Rate Wideband (AMR-WB) speech codec. This format shall be used as a common reference point when interfacing speech frames between different elements of the 3G system
24、and between different systems. Appropriate mappings to and from this generic frame format will be used within and between each system element. Annex A describes a second frame format which shall be used when octet alignment of AMR-WB frames is required. 2 References The following documents contain p
25、rovisions 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 reference, subsequent revisions do not apply. - For a non-speci
26、fic reference, the latest version applies. 1 3GPP TS 26.190: “AMR Wideband Speech Codec; Speech Transcoding Functions“. 2 3GPP TS 26.193: “AMR Wideband Speech Codec; Source Controlled Rate Operation“. 3 3GPP TS 26.192: “AMR Wideband Speech Codec; Comfort Noise Aspects“. 3 Definitions and Abbreviatio
27、ns 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: AMR-WB mode: one of the nine AMR-WB codec bit-rates denoted also with indices 0 to 8 where 0 maps to the 6.60 kbit/s mode and 8 maps to the 23.85 kbit/s mode. AMR-WB codec mode: same as AMR-WB mod
28、e. RX_TYPE: classification of the received frame as defined in 2. TX_TYPE: classification of the transmitted frame as defined in 2. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: CRC Cyclic Redundancy Check FQI Frame Quality Indicator GSM Global System
29、 for Mobile communication LSB Least Significant Bit MSB Most Significant BitRX Receive SCR Source Controlled Rate operation SID Silence Descriptor (Comfort Noise Frame) TX Transmit ETSI ETSI TS 126 201 V15.0.0 (2018-07)63GPP TS 26.201 version 15.0.0 Release 154 AMR-WB codec Interface format 1 (AMR-W
30、B IF1) This clause describes the generic frame format for both the speech and comfort noise frames of the AMR-WB speech codec. This format is referred to as AMR-WB Interface Format 1 (AMR-WB IF1). Annex A describes AMR-WB Interface Format 2 (AMR-WB IF2). Each AMR-WB codec mode follows the generic fr
31、ame structure depicted in figure 1. The frame is divided into three parts: AMR-WB Header, AMR-WB Auxiliary Information, and AMR-WB Core Frame. The AMR-WB Header part includes the Frame Type and the Frame Quality Indicator fields. The AMR-WB auxiliary information part includes the Mode Indication, Mo
32、de Request, and Codec CRC fields. The AMR-WB Core Frame part consists of the speech parameter bits or, in case of a comfort noise frame, the comfort noise parameter bits. In case of a comfort noise frame, the comfort noise parameters replace Class A bits of AMR-WB Core Frame while Class B and C bits
33、 are omitted. It is to be noted that unlike AMR, AMR-WB uses only two bit protection classes A and B. In no case bits are assigned to protection class C and, correspondingly, no RAB subflow needs to be allocated for such a class. The mentioning of class C is only done for the purpose of keeping unif
34、ormity of this specification with the corresponding specification for AMR. Frame Type (4 bits) Frame Quality Indicator (1 bit) Mode Indication (4 bits) Mode request (4 bits) Codec CRC (8 bits) AMR-WB Header AMR-WB Auxiliary Information (for Tandem Free Operation, Mode Adaptation, and Error Detection
35、) Class A bits Class B bits Class C bits AMR-WB Core Frame (speech or comfort noise data) Figure 1. Generic AMR-WB frame structure 4.1 AMR-WB Header and AMR-WB Auxiliary Information This subclause describes the AMR-WB Header of figure 1. 4.1.1 Frame Type, Mode Indication, and Mode Request Table 1a d
36、efines the 4-bit Frame Type field. Frame Type can indicate the use of one of the nine AMR-WB codec modes, comfort noise frame, lost speech frame, or an empty frame. In addition, four Frame Type Indices are reserved for future use. The same table is reused for the Mode Indication and Mode Request fie
37、lds which are 4-bit fields each and are defined only in the range 08 to specify one of the nine AMR-WB codec modes. ETSI ETSI TS 126 201 V15.0.0 (2018-07)73GPP TS 26.201 version 15.0.0 Release 15Table 1a: Interpretation of Frame Type, Mode Indication and Mode Request fields. Frame Type Index Mode In
38、dication Mode Request Frame content (AMR-WB mode, comfort noise, or other) 0 0 0 AMR-WB 6.60 kbit/s 1 1 1 AMR-WB 8.85 kbit/s 2 2 2 AMR-WB 12.65 kbit/s 3 3 3 AMR-WB 14.25 kbit/s 4 4 4 AMR-WB 15.85 kbit/s 5 5 5 AMR-WB 18.25 kbit/s 6 6 6 AMR-WB 19.85 kbit/s 7 7 7 AMR-WB 23.05 kbit/s 8 8 8 AMR-WB 23.85
39、kbit/s 9 - - AMR-WB SID (Comfort Noise Frame) 10-13 - - For future use 14 - speech lost15 - - No Data (No transmission/No reception) - 4.1.2 Frame Quality Indicator The content of the Frame Quality Indicator field is defined in Table 1b. The field length is one bit. The Frame Quality Indicator indic
40、ates whether the data in the frame contains errors. Table 1b: Definition of Frame Quality Indicator Frame Quality Indicator (FQI) Quality of data 0 Bad frame or Corrupted frame (bits may be used to assist error concealment) 1 Good frame 4.1.3 Mapping to TX_TYPE and RX_TYPE Table 1c shows how the AMR
41、-WB Header data (FQI and Frame Type) maps to the TX_TYPE and RX_TYPE frames defined in 2. Table 1c: Mapping of Frame Quality Indicator and Frame Type to TX_TYPE and RX_TYPE 2, respectively Frame Quality Indicator Frame Type Index TX_TYPE or RX_TYPE Comment 1 0-8 SPEECH_GOOD The specific Frame Type I
42、ndex depends on the bit-rate being used. 0 0-8 SPEECH_BAD The specific Frame Type Index depends on the bit-rate being used. The corrupted data may be used to assist error concealment. 0 14 SPEECH_LOST No useful information. An erased or stolen frame with no data usable to assist error concealment. 1
43、 9 9 SID_FIRST or SID_UPDATE SID_FIRST and SID_UPDATE are differentiated using one Class A bit: STI. 0 9 SID_BAD 1 15 NO_DATA Typically a non-transmitted frame. ETSI ETSI TS 126 201 V15.0.0 (2018-07)83GPP TS 26.201 version 15.0.0 Release 154.1.4 Codec CRC Generic AMR-WB codec frames with Frame Type
44、09 are associated with an 8-bit CRC for error-detection purposes. The Codec CRC field of AMR-WB Auxiliary Information in figure 1 contains the value of this CRC. These eight parity bits are generated by the cyclic generator polynomial: - G(x)=D8+ D6+ D5+ D4+ 1 which is computed over all Class A bits
45、 of AMR-WB Core Frame. Class A bits for Frame Types 08 are defined in subclause 4.2.2 (for speech bits) and for Frame Type 9 in subclause 4.2.3 (for comfort noise bits). When Frame Type Index of table 1a is 14 or 15, the CRC field is not included in the Generic AMR-WB frame. 4.2 AMR-WB Core Frame Th
46、is subclause contains the description of AMR-WB Core Frame of figure 1. The descriptions for AMR-WB Core Frame with speech bits and with comfort noise bit are given separately. 4.2.1 AMR-WB Core Frame with speech bits: Bit ordering This subclause describes how AMR-WB Core Frame carries the coded spe
47、ech data. The bits produced by the speech encoder are denoted as s(1),s(2),.,s(K), where K refers to the number of bits produced by the speech encoder as shown in table 2. The notation s(i) follows that of 1. The speech encoder output bits are ordered according to their subjective importance. This b
48、it ordering can be utilized for error protection purposes when the speech data is, for example, carried over a radio interface. Tables B.1 to B.9 in Annex B define the AMR-WB IF1 bit ordering for all the nine AMR-WB codec modes. In these tables the speech bits are numbered in the order they are prod
49、uced by the corresponding speech encoder as described in the relevant tables of 3GPP TS 26.190 1. The reordered bits are denoted below, in the order of decreasing importance, as d(0),d(1),.,d(K-1). The ordering algorithm is described in pseudo code as: - for j = 0 to K-1 - d(j) := s(tablem(j)+1); where tablem(j) refers to the relevant table in Annex B depending on the AMR-WB mode m=08. The Annex B tables should be read line by line from left to right. The first element of the table has the index 0. 4.2.2 AMR-WB Core Frame with speech bits: Class divisi
