1、COVERING NOTE GENERAL SECRETARIAT INTERNATIONAL TELECOMMUNICATION UNION Geneva, 29 July 2003 ITU -TELECOMMUNICATION STANDARDIZATION SECTOR Subject: Corrigendum 1 (0712003) to ITU-T Recommendation G.722.2 Annex E (01/2002), Wideband coding of speech at around 16 kbith using Adaptive Multi-Rate Wideba
2、nd (AMR- WB) - Annex E: Frame structure 1) In clause E.3.2.3, correct the pseudo-code as follows (remove “s“): for j = 36 to 39; do) := smi(39-j). 2) In Table E.8, correct the typography of bits s14, s22 and s30 (caps to lower case): -14, -22, -30 Union internationale des tlcommunications Place des
3、Nations 121 1 GENVE 20 Suisse - Switzerland - Suiza ! I INTERNATIONAL TELECOMMUNICATION UNION I ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU G.722.2 Annex E (O1 12002) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments - Coding of analogue sig
4、nals by methods other than PCM Wideband coding of speech at around 16 kbits using Adaptive Multi-Rate Wideband (AMR-WB) Annex E: Frame structure ITU-T Recommendation 6.722.2 - Annex E INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU G.722.2 Annex E (O1 /200
5、2) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments - Coding of analogue signals by methods other than PCM Wideband coding of speech at around 16 kbis using Adaptive Multi-Rate Wideband (AMR-WB) Annex E: Frame structure ITU-T Recommendation G.722.2 -
6、 Annex E ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS TRANSMISSION SYSTEMS GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER- INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON
7、METALLIC LINES GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE METALLIC LINES COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY TESTING EQUIPMENTS TRANSMISSION MEDIA CHARACTENSTICS DIGITAL TERMINAL EQUIPMENTS SYSTEMS ON RADIO-RELAY OR SATELLJTE LINKS AND INTERCONNECTION General G.100-G. 1
8、99 G.200-G.299 G.300-G.399 G.400-G.449 G.450-G.499 G.500-G.599 G.600-G.699 G.700-G.799 G.700-G.709 Coding of analogue signals by pulse code modulation Principal characteristics of primary multiplex equipment G.7 10-G.719 G.730-G.739 Principal characteristics of second order multiplex equipment Princ
9、ipal characteristics of higher order multiplex equipment Principal characteristics of transcoder and digital multiplication equipment Operations, administration and maintenance features of transmission equipment Principal characteristics of multiplexing equipment for the synchronous digital hierarch
10、y Other terminal equipment DIGITAL NETWORKS DIGITAL SECTIONS AND DIGITAL LINE SYSTEM QUALITY OF SERVICE AND PERFORMANCE TRANSMISSION MEDIA CHARACTERISTICS General Symmetric cable pairs Land coaxial cable pairs Submarine cables Optical fibre cables Characteristics of optical components and subsystems
11、 General Coding of analogue signals by pulse code modulation Coding of analogue signals by methods other than PCM Principal characteristics of primary multiplex equipment Principal characteristics of second order multiplex equipment Principal characteristics of higher order multiplex equipment Princ
12、ipal characteristics of transcoder and digital multiplication equipment Operations, administration and maintenance features of transmission equipment Principal characteristics of multiplexing equipment for the synchronous digital hierarchy Other terminal equipment General aspects Design objectives f
13、or digital networks Quality and availability targets Network capabilities and functions SDH network characteristics Management of transport network SDH radio and satellite systems integration Optical transport networks DIGITAL TERMINAL EQUIPMENTS DIGITAL NETWORKS G.740-G.749 G.750-G.759 G.760-G.769
14、G.770-G.779 G. 780-G. 7 89 G.790-G.799 G. 800-G. 899 G.900-G.999 G.lOOO-G.1999 G.6000-G.6999 G.6000-G.6099 G.6100-G.6 199 G.6200-G.6299 G.6300-G.6499 G.6500-G.6599 G.6600-G.6999 G.7000-G.7999 G.7000-G.7099 G.7 100-G.7199 G.7200-G.7299 G.73 004.73 99 G.7400-G.7499 G.7500-G.7599 G.7600-G.7699 G.7700-G
15、.7799 G.7800-G.7899 G.7900-G.7999 G.8000-G.8999 G.8000-G.8099 G.8 100-G.8 199 G.8200-G.8299 G.8300-G.8399 G.8400-G.8499 G.8500-G.8599 G. 8600-G. 8699 G. 8700-G.8799 Forfirther details, please refer to the list of ITU-TRecommendations. ITU-T Recommendation G.722.2 Wideband coding of speech at around
16、16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB) Annex E Frame structure Summary This annex describes frame formats for the Adaptive Multi-Rate Wideband (AMR-WB) speech codec. One is based on the 3GPP format and the other is octet-aligned for packet applications. The frame formats specified in
17、this annex were also adopted by 3GPP in 3GPP specification TS 26.201. Source Annex E to ITU-T Recommendation G.722.2 was prepared by ITU-T Study Group 16 (2001-2004) and approved under the WTSA Resolution 1 procedure on 13 January 2002. ITU-T Rec. G.722.21Annex E (01/2002) 1 FOREWORD The Internation
18、al Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations
19、on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of
20、 ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is
21、 used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. IT
22、U takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual prop
23、erty, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 2002 All rights reserved. No part of this publication
24、may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.722.2/Annex E (01/2002) 11 CONTENTS Page E . 1 E.2 E.2.1 E.2.2 E.3 E.3.1 E.3.2 E.3.3 E.4 ES Scope Definitions and Abbreviations Definitions Abbreviations . AMR-WB codec Interface format 1 (AMR-WB IF
25、1) AMR-WB Header and AMR-WB Auxiliary Information AMR-WB Core Frame . Generic AMR-WB Frame Composition . AMR-WB Interface Format 2 with octet alignment (AMR-WB IF2) . Tables for AMR-WB Core Frame bit ordering . 1 2 2 4 6 9 11 . ITU-T Rec . G.722.2lAnnex E (01/2002) 111 ITU-T Recommendation G.722.2 W
26、ideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB) Annex E Frame structure E.l Scope Clause E.3 describes the 3GPP frame format (hereafter referred to as generic frame format) for the Adaptive Multi-Rate Wideband (AMR-WB) speech codec. This format shall be used
27、as a common reference point when interfacing speech frames between different elements of a system and between different systems. Appropriate mappings to and from this generic frame format will be used within and between each system element. Clause E.4 describes a second frame format to be used when
28、octet alignment of AMR-WE! frames is required (eg. for packet-based applications). E.2 Definitions and Abbreviations E.2.1 Definitions This annex defines the following terms: E.2.1.1 AMR-WB mode: one of the nine AMR-WB codec bit-rates denoted also with indices O to 8 where O maps to the 6.60 kbit/s
29、mode and 8 maps to the 23.85 kbit/s mode. E.2.1.2 AMR-WB codec mode: same as AMR-WE! mode. E.2.1.3 RX-TYPE: classification of the received frame as defined in Annex B/G.722.2. E.2.1.4 TX-TYPE: classification of the transmitted fiame as defmed in Annex BG.722.2. E.2.2 Abbreviations This annex uses th
30、e following abbreviations: CRC Cyclic Redundancy Check FQI Frame Quality Indicator GSM LSB Least Significant Bit MSB Most Significant Bit Rx Receive SCR Source Controlled Rate (operation) SID Tx Transmit Global System for Mobile Communications Silence Insertion Descriptor (Comfort Noise Frame) ITU-T
31、 Rec. G.722.2/Annex E (01/2002) 1 E.3 This clause describes the generic frame format for both the speech and comfort noise fiames of the AMR-WB speech codec. This format is referred to as AMR-WE3 Interface Format 1 (AMR-WB IF1). Clause E.4 describes AMR-WB Interface Format 2 (AMR-WB IF2) with octet
32、alignment for packet based applications. Each AMR-WB codec mode follows the generic fiame structure depicted in Figure E. 1. The frame is divided into three parts: AMR-WB Header, AMR-WB Auxiliary Information, and AMR-WE3 Core Frame. The AMR-WB Header part includes the Frame Type and the Frame Qualit
33、y 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 fiame, the comfort noise parameter bits. In case of a comfort noise frame, the c
34、omfort noise parameters replace Class A bits of AMR-W Core Frame while Class B and C bits are omitted. AMR-WB codec Interface format 1 (AMR-WB mi) Frame Type (4 bits) , Frame Quality Indicator (1 bit) -AMR-WB Core Frame (speech or comfort noise data) Mode Indication (4 bits) Mode Request (4 bits) Co
35、dec CRC (8 bits) r I Class A bits I I Class B bits I Class C bits I AMR-WB Header 3 AMR-WB Auxiliary Information (for Tandem Free Operation, Mode Adaptation, and Error Detection) Figure E.UG.722.2 - Generic AMR-WB frame structure E.3.1 This clause describes the AMR-WB Header of Figure E.l. The Auxil
36、ary Information fields will be applicable in interfacing with some wireless system (e.g. GSM). E.3.1.1 Frame Type, Mode Indication and Mode Request Table E.la 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 f
37、iame, or an empty fiame. In addition, four Frame Type Indices are 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 0.3 to specifi one of the nine AMR-WB codec modes. AMR-WB Header and AMR-W
38、B Auxiliary Information 2 ITU-T Rec. G.722.2/Annex E (01/2002) Table E.la/G.722.2 - Interpretation of Frame Type, Mode Indication and Mode Request fields. Frame Quality Indicator QI) O 1 E.3.1.2 Frame Quality Indicator The content of the Frame Quality Indicator field is defined in Table E.lb. The fi
39、eld length is one bit. The Frame Quality Indicator indicates whether the data in the frame contains errors. Quality of data Bad frame or Corrupted frame (bits may be used to assist error concealment) Good frame Table E.lb/G.722.2 - Definition of Frame Quality Indicator E.3.1.3 Mapping to TX-TYPE and
40、 RX-TYPE Table E.lc shows how the AMR-WB Header data (FQI and Frame Type) maps to the TX - TYPE and RX-TYPE frames defined in Annex B/G.722.2. ITU-T Rec. G.722.WAnnex E (01/2002) 3 Table E.ldG.722.2 - Mapping of Frame Quality Indicator and Frame Type to TX-TYPE and RX-TYPE, respectively E.3.1.4 Code
41、c CRC Generic AMR-WE3 codec frames with Frame Type O .9 are associated with an 8-bit CRC for error- detection purposes in wireless systems. The Codec CRC field of AMR-WB Auxiliary Information in Figure E.l contains the value of this CRC. These eight parity bits are generated by the cyclic generator
42、polynomial: - which is computed over all Class A bits of AMR-WB Core Frame. Class A bits for Frame Types 08 are defined in E.3.2.2 (for speech bits) and for Frame Type 9 in E.3.2.3 (for comfort noise bits). When Frame Type Index of Table E.la is 14 or 15, the CRC field is not included in the Generic
43、 AMR-WB frame. G(x) = D8+ D6+ D5 + D4 + 1 E.3.2 AMR-WB Core Frame This subclause contains the description of AMR-WB Core Frame of Figure E.l. The descriptions for AMR-WE3 Core Frame with speech bits and with comfort noise bit are given separately. E.3.2.1 This clause describes how AMR-WE3 Core Frame
44、 carries the coded speech data. The bits produced by the speech encoder are denoted as s(l),s(2),s(Q), where K refers to the number of bits produced by the speech encoder as shown in Table E.2. The notation s(i) follows that of G.722.2. The speech encoder output bits are ordered according to their s
45、ubjective importance. This bit ordering can be utilized for error protection purposes when the speech data is, for example, carried over a radio interface. Tables E. 11 to E. 19 in ES define the AMR-WB IF1 bit ordering for all the nine AMR-WB codec modes. In these tables, the speech bits are numbere
46、d in the order they are produced by the corresponding speech encoder as described in the relevant tables of G.722.2. The reordered bits are denoted below, in the order of decreasing importance, as d(O),d( l),d(K-l). The ordering algorithm is described in pseudo code as: - - AMR-WB Core Frame with sp
47、eech bits: Bit ordering forj = O to K-1 do) := s(tabZe,(j) + 1); 4 ITU-T Rec. G.722.2lAnnex E (0112002) where table, dG) := s(j+ 1); d(35) := STI; for j = 36 to 39; d(i := smi(39-j). Table E.3/6.722.2 - Bit classification for Frame Type 9: AMR-WB SID (Comfort Noise Frame) AMR-WB no transmission fram
48、e type (14 or 15) contains the AMR-WB Header information (as defined in Figure E.l), while AMR-WB Auxiliary Information and AMR-WB Core fiame are omitted. The AMR-WB Header includes the corresponding Frame Type and the Frame Quality Indicator (as defined in Table E. lc). E.3.3 Generic AMR-WB Frame C
49、omposition The generic AMR-WB fiame is formed as a concatenation of AMR-WB Header, AMR-WB Auxiliary Information and the AMR-WB Core Frame, in this order. The MSB of the Frame Type is placed in bit 8 of the first octet (see example in Table E.4), the LSB of the Frame Type is placed in bit 5. Then the next parameter follows, which is the Frame Quality Indicator, and so on. After FQI, three spare bits are inserted to align the Codec CRC and the AMR-WB Core fiame to the octet boundary. The first bit of the AMR-WB Core fiame d(0) is placed in bit 8 of octet 4. The last bit of the
