1、 ETSI TS 126 201 V14.0.0 (2017-04) 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 14.0.0 Relea
2、se 14) TECHNICAL SPECIFICATION ETSI ETSI TS 126 201 V14.0.0 (2017-04)13GPP TS 26.201 version 14.0.0 Release 14Reference RTS/TSGS-0426201ve00 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
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9、 Marks registered and owned by the GSM Association. ETSI ETSI TS 126 201 V14.0.0 (2017-04)23GPP TS 26.201 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essentia
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12、ich are, or may be, or may become, essential to the present 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
13、GSM identities. These should be interpreted as being references 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“, “s
14、hould“, “should not“, “may“, “need not“, “will“, “will not“, “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.
15、 ETSI ETSI TS 126 201 V14.0.0 (2017-04)33GPP TS 26.201 version 14.0.0 Release 14Contents Intellectual 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 Inter
16、face format 1 (AMR-WB IF1) . 6g34.1 AMR-WB Header and AMR-WB Auxiliary Information 6g34.1.1 Frame Type, 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
17、bits: Bit ordering 8g34.2.2 AMR-WB Core Frame with speech bits: Class division 8g34.2.3 AMR-WB Core Frame 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
18、bit ordering 14g3Annex C (informative): Change history . 22g3History 23g3ETSI ETSI TS 126 201 V14.0.0 (2017-04)43GPP TS 26.201 version 14.0.0 Release 14Foreword This Technical Specification (TS) has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document a
19、re 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
20、 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 increment
21、ed when editorial only changes have been incorporated in the document. ETSI ETSI TS 126 201 V14.0.0 (2017-04)53GPP TS 26.201 version 14.0.0 Release 141 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
22、 a common reference point when interfacing speech frames between different elements of the 3G system 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 u
23、sed when octet alignment of AMR-WB frames is required. 2 References The following documents contain provisions 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.
24、) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific 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 3G
25、PP TS 26.192: “AMR Wideband Speech Codec; Comfort Noise Aspects“. 3 Definitions and Abbreviations 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
26、the 6.60 kbit/s mode and 8 maps to the 23.85 kbit/s mode. AMR-WB codec mode: same as AMR-WB mode. 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
27、 abbreviations apply: CRC Cyclic Redundancy Check FQI Frame Quality Indicator GSM Global System 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 V14
28、.0.0 (2017-04)63GPP TS 26.201 version 14.0.0 Release 144 AMR-WB codec Interface format 1 (AMR-WB 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
29、describes AMR-WB Interface Format 2 (AMR-WB IF2). Each AMR-WB codec mode follows the generic frame 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 Q
30、uality Indicator fields. The AMR-WB auxiliary information part includes the Mode Indication, Mode 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,
31、the comfort noise parameters replace Class A bits of AMR-WB Core Frame while Class B and C bits 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 all
32、ocated for such a class. The mentioning of class C is only done for the purpose of keeping uniformity 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 Heade
33、r AMR-WB Auxiliary Information (for Tandem Free Operation, Mode Adaptation, and Error Detection) 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 describe
34、s the AMR-WB Header of figure 1. 4.1.1 Frame Type, Mode Indication, and Mode Request Table 1a defines 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
35、 reserved for future use. The same table is reused for the Mode Indication and Mode Request fields 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 V14.0.0 (2017-04)73GPP TS 26.201 version 14.0.0 Release 14Table 1a:
36、Interpretation of Frame Type, Mode Indication and Mode Request fields. Frame Type Index Mode Indication 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
37、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 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 Indicat
38、or field is defined in Table 1b. The field length is one bit. The Frame Quality Indicator indicates 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
39、error concealment) 1 Good frame 4.1.3 Mapping to TX_TYPE and RX_TYPE Table 1c shows how the AMR-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 In
40、dicator Frame Type Index TX_TYPE or RX_TYPE Comment 1 0-8 SPEECH_GOOD The specific Frame Type Index 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 u
41、seful information. An erased or stolen frame with no data usable to assist error concealment. 1 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 V14.0.0 (2017-04)83GPP
42、TS 26.201 version 14.0.0 Release 144.1.4 Codec CRC Generic AMR-WB codec frames with Frame Type 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 th
43、e cyclic generator polynomial: - G(x)=D8+ D6+ D5+ D4+ 1 which is computed over all Class A bits 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 i
44、s 14 or 15, the CRC field is not included in the Generic AMR-WB frame. 4.2 AMR-WB Core Frame This 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
45、 speech bits: Bit ordering This subclause describes how AMR-WB Core Frame carries the coded speech 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
46、 1. The speech encoder output bits are ordered according to their subjective importance. This bit 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 n
47、ine AMR-WB codec modes. In these tables the speech bits are numbered in the order they are produced 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 ord
48、ering 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
49、.2.2 AMR-WB Core Frame with speech bits: Class division The reordered bits are further divided into three indicative classes according to their subjective importance. The three different importance classes can then be subject to different error protection in the network. The importance classes are Class A, Class B, and Class C. Class A contains the bits most sensitive to errors and any error in these bits typically results in a corrupted speech frame which should not be decoded without applying appropriate error concealment. This class is protec
