3GPP TS 26.101: Adaptive Multi-Rate (AMR) speech codec frame structure

3GPP TS 26.101 V9.0.0 (2009-12)
Technical Specification
3rd Generation Partnership Project;
Technical Specification Group Services and System Aspects;
Mandatory speech codec speech processing functions;
Adaptive Multi-Rate (AMR) speech codec frame structure
(Release 9)


	 EMBED Word.Picture.8  	
The present document has been developed within the 3rd Generation Partnership Project (3GPP TM) and may be further elaborated for the purposes of 3GPP.
The present document has not been subject to any approval process by the 3GPP Organizational Partners and shall not be implemented.
This Specification is provided for future development work within 3GPP only. The Organizational Partners accept no liability for any use of this Specification.
Specifications and reports for implementation of the 3GPP TM system should be obtained via the 3GPP Organizational Partners' Publications Offices.



Keywords
GSM, UMTS, codec, AMR, LTE

3GPP
Postal address

3GPP support office address
650 Route des Lucioles - Sophia Antipolis
Valbonne - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Internet
 HYPERLINK "http://www.3gpp.org" http://www.3gpp.org

Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.

© 2009, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC).
All rights reserved.

UMTS™ is a Trade Mark of ETSI registered for the benefit of its members
3GPP™ is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners
LTE™ is a Trade Mark of ETSI currently being registered for the benefit of its Members and of the 3GPP Organizational Partners
GSM® and the GSM logo are registered and owned by the GSM Association

Contents
 TOC \o "1-9" Foreword	 PAGEREF _Toc248223132 \h 4
1	Scope	 PAGEREF _Toc248223133 \h 5
2	References	 PAGEREF _Toc248223134 \h 5
3	Definitions and Abbreviations	 PAGEREF _Toc248223135 \h 5
3.1	Definitions	 PAGEREF _Toc248223136 \h 5
3.2	Abbreviations	 PAGEREF _Toc248223137 \h 5
4	AMR codec frame format (AMR IF1)	 PAGEREF _Toc248223138 \h 6
4.1	AMR Header and AMR Auxiliary Information	 PAGEREF _Toc248223139 \h 6
4.1.1	Frame Type, Mode Indication, and Mode Request	 PAGEREF _Toc248223140 \h 6
4.1.2	Frame Quality Indicator	 PAGEREF _Toc248223141 \h 7
4.1.3	Mapping to TX_TYPE and RX_TYPE	 PAGEREF _Toc248223142 \h 7
4.1.4	Codec CRC	 PAGEREF _Toc248223143 \h 8
4.2	AMR Core Frame	 PAGEREF _Toc248223144 \h 8
4.2.1	AMR Core Frame with speech bits: Bit ordering	 PAGEREF _Toc248223145 \h 8
4.2.2	AMR Core Frame with speech bits: Class division	 PAGEREF _Toc248223146 \h 9
4.2.3	AMR Core Frame with comfort noise bits	 PAGEREF _Toc248223147 \h 9
4.3	AMR frame composition	 PAGEREF _Toc248223148 \h 10
4.4	GSM-EFR Frame Composition	 PAGEREF _Toc248223149 \h 11
4.4.1	GSM-EFR Frame with speech bits	 PAGEREF _Toc248223150 \h 12
4.4.2	GSM-EFR Frame with comfort noise bits	 PAGEREF _Toc248223151 \h 12
Annex A (informative):	AMR Interface Format 2 (with octet alignment)	 PAGEREF _Toc248223152 \h 13
Annex B (normative):	Tables for AMR Core Frame bit ordering	 PAGEREF _Toc248223153 \h 17
Annex C (informative):	Change history	 PAGEREF _Toc248223154 \h 20

Foreword
This Technical Specification has been produced by the 3rd Generation 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 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 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 incorporated in the document.

1	Scope
The present document describes a generic frame format for the Adaptive Multi-Rate (AMR) speech codec and the Enhanced Full Rate (GSM-EFR) speech codec. This format shall be used as 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 used when octet alignment of AMR 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.) 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 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]	TS 26.090: "AMR Speech Codec; Speech Transcoding Functions".
[2]	TS 26.093: "AMR Speech Codec; Source Controlled Rate Operation".
[3]	TS 26.092: "AMR Speech Codec; Comfort Noise Aspects".
[4]	TS 46.060: "EFR Speech Codec; Speech Transcoding Functions".
[5]	TS 46.062: "EFR 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 mode: one of the eight AMR codec bit-rates denoted also with indices 0 to 7 where 0 maps to the 4.75 kbis/s mode and 7 maps to the 12.2 kbit/s mode.
AMR codec mode: same as AMR 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 abbreviations apply:
CRC	Cyclic Redundancy Check
FQI	Frame Quality Indicator
GSM	Global System for Mobile communication
LSB	Least Significant Bit
MSB	Most Significant Bit
RX	Receive
PDC	Personal Digital Communication (ARIB standard)
SCR	Source Controlled Rate operation
SID	Silence Descriptor (Comfort Noise Frame)
TDMA	Time Division Multiple Access (IS-641)
TX	Transmit
4	AMR codec frame format (AMR IF1)
This clause describes the generic frame format for both the speech and comfort noise frames of the AMR speech codec. This format is referred to as AMR Interface Format 1 (AMR IF1). Annex A describes AMR Interface Format 2 (AMR IF2).
Each AMR codec mode follows the generic frame structure depicted in figure 1. The frame is divided into three parts: AMR Header, AMR Auxiliary Information, and AMR Core Frame. The AMR Header part includes the Frame Type and the Frame Quality Indicator fields. The AMR auxiliary information part includes the Mode Indication, Mode Request, and Codec CRC fields.  The AMR 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 Core Frame while Class B and C bits are omitted.

Figure 1: Generic AMR frame structure
4.1	AMR Header and AMR Auxiliary Information
This subclause describes the AMR 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 eight AMR codec modes, one of four different comfort noise frames, or an empty frame. In addition, three Frame Type Indices are reserved for future use. The same table is reused for the Mode Indication and Mode Request fields which are 3-bit fields each and are defined only in the range 0…7 to specify one of the eight AMR codec modes.
Table 1a: Interpretation of Frame Type,
Mode Indication and Mode Request fields
Frame Type

Mode Indication
Mode Request
Frame content (AMR mode, comfort noise, or other)
0
0
0
AMR 4,75 kbit/s 
1
1
1
AMR 5,15 kbit/s 
2
2
2
AMR 5,90 kbit/s 
3
3
3
AMR 6,70 kbit/s (PDC-EFR)
4
4
4
AMR 7,40 kbit/s (TDMA-EFR)
5
5
5
AMR 7,95 kbit/s 
6
6
6
AMR 10,2 kbit/s 
7
7
7
AMR 12,2 kbit/s (GSM-EFR)
8
-
-
AMR SID
9
-
-
GSM-EFR SID
10
-
-
TDMA-EFR SID 
11
-
-
PDC-EFR SID
12-14
-
-
For future use
15
-
-
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 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 error concealment)
1
Good frame

4.1.3	Mapping to TX_TYPE and RX_TYPE
Table 1c shows how the AMR 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
0-7
SPEECH_GOOD
The specific Frame Type Index depends on the bit-rate being used.
0
0-7
SPEECH_BAD
The specific Frame Type Index depends on the bit-rate being used. The corrupted data may be used to assist error concealment.
1
8
8
SID_FIRST or 
SID_UPDATE
For AMR: SID_FIRST and  SID_UPDATE
are differentiated using one Class A bit: STI.
0
8
SID_BAD
For AMR
1
9
GSM-EFR SID
For GSM-EFR
0
9
GSM-EFR SID_BAD
For GSM-EFR
1
10-11
SID_UPDATE
For TDMA-EFR and PDC-EFR
0
10-11
SID_BAD
For TDMA-EFR and PDC-EFR
1
15
NO_DATA
Typically a non-transmitted frame or an erased or stolen frame with no data usable to assist error concealment.

4.1.4	Codec CRC
Generic AMR codec frames with Frame Type 0.11 are associated with an 8-bit CRC for error-detection purposes. The Codec CRC field of AMR 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 of AMR Core Frame. Class A bits for Frame Types 0.7 are defined in subclause 4.2.2 (for speech bits) and for Frame Types 8.11 in subclause 4.2.3 (for comfort noise bits).
When Frame Type Index of table 1a is 15 the CRC field is not included in the Generic AMR frame.
4.2	AMR Core Frame
This subclause contains the description of AMR Core Frame of figure 1. The descriptions for AMR Core Frame with speech bits and with comfort noise bit are given separately.
4.2.1	AMR Core Frame with speech bits: Bit ordering
This subclause describes how AMR 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 [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.8 in Annex B define the AMR IF1 bit ordering for all the eight AMR 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 TS 26.090 [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 mode m=0..7. 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 Core Frame with speech bits: Class division
The reordered bits are further divided into three indicative classes according to their subjective importance.  This class division is only informative and provides supporting information for mapping this generic format into specific formats. 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 protected by the Codec CRC in AMR Auxiliary Information. Classes B and C contain bits where increasing error rates gradually reduce the speech quality, but decoding of an erroneous speech frame is usually possible without annoying artefacts. Class B bits are more sensitive to errors than Class C bits. The importance ordering applies also within the three different classes and there are no significant step-wise changes in subjective importance between neighbouring bits at the class borders.
The number of speech bits in each class (Class A, Class B, and Class C) for each AMR mode is shown in table 2. The classification in table 2 and the importance ordering d(j), together, are sufficient to assign all speech bits to their correct classes. For example, when the AMR codec mode is 4.75, then the Class A bits are d(0)..d(41), Class B bits are d(42)..d(94), and there are no Class C bits.
Table 2: Number of bits in Classes A, B, and C for each AMR codec mode
Frame Type
AMR
codec mode
Total number of bits
Class A
Class B
Class C
0
4,75
95
42
53
0
1
5,15
103
49
54
0
2
5,90
118
55
63
0
3
6,70
134
58
76
0
4
7,40
148
61
87
0
5
7,95
159
75
84
0
6
10,2
204
65
99
40
7
12,2
244
81
103
60

4.2.3	AMR Core Frame with comfort noise bits
The AMR Core Frame content for the additional frame type with Frame Type Index 8 in table 1a is described in this subclause. This consists of the frame related to Source Controlled Rate Operation specified in [2].
The data content (comfort noise bits) of the additional frame types is carried in AMR Core Frame. The comfort noise bits are all mapped to Class A of AMR Core Frame and Classes B and C are not used. This is a notation convention only and the class division has no meaning for comfort noise bits.
The number of bits in each class (Class A, Class B, and Class C) for the AMR comfort noise bits (Frame Type Index 8) is shown in table 3. The contents of SID_UPDATE and SID_FIRST are divided into three parts (SID Type Indicator (STI), Mode Indication (mi(i)), and Comfort Noise Parameters (s(i)) as defined in [2]. In case of SID_FIRST the Comfort Noise Parameters bits (s(i)) shall be set to “0”.
The comfort noise parameter bits produced by the AMR speech encoder are denoted as s(i) = {s(1),s(2),...,s(35)}. The notation s(i) follows that of [3]. These bits are numbered in the order they are produced by the AMR encoder without any reordering. These bits are followed by the SID Type Indicator STI and the Mode Indication 
mi(i) ={mi(0), mi(1), mi(2)} ={LSB .. MSB}. Thus, the AMR SID or comfort noise bits {d(0),d(1),…,d(38)}are formed as defined by the pseudo code below.
-	for j = 0 to 34;
-	d(j) := s(j+1);
-	d(35) := STI;
-	for j = 36 to 38;
-	d(j) := mi(j-36). Note: This mapping is different to the usual mapping: LSB first. 
						Note: The alternative would be: d(j) := mi(38-j): MSB first.
Table 3. Bit classification for Frame Type 8 (AMR SID)
Frame Type Index
FQI
AMR
TX_TYPE or RX_TYPE
Total number of bits
Class A
Class B
Class C
SID Type Indicator (STI)Mode
Indication
mi(i)Comfort
Noise Parameter s(i)8
1
SID_UPDATE
39
1 (= "1")
3
35
0
0
8
1
SID_FIRST
39
1 (= "0")
3
35 (= "0")
0
0
8
0
SID_BAD
39
1
3
35
0
0

The number of bits in each class (Class A, Class B, and Class C) for the comfort noise bits of Frame Types 9-11 is shown in Table 7. 

Table 4: void

4.3	AMR frame composition
The generic AMR frame is formed as a concatenation of AMR Header, AMR Auxiliary Information and the AMR Core Frame, in this order. The MSB of the Frame Type is placed in bit 8 of the first octet (see example in table 5 below), 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. Between Mode Request and Codec CRC five spare bits are inserted to align the Codec CRC and the AMR Core frame to the octet boundary. The first bit of the AMR Core frame d(0) is placed in bit 8 of octet 4. The last bit of the generic AMR frame is the last bit of AMR Core Frame, which is the last bit of speech bits or the last bit of comfort noise bits, as defined in subclauses 4.2.1 and 4.2.3. Table 5 shows the composition for the example of the Codec Mode 6.7kbit/s and table 6 shows the composition for the AMR SID frame.
Table 5: Mapping of an AMR speech coding mode into the generic AMR frame, AMR IF1,
example: AMR 6.7 kbit/s,  "good frame", Mode Request = 1.


MSB
Mapping of bits
AMR 6.7

LSB
Octet
bit 8bit 7bit 6bit 5bit 4bit 3bit 2bit 11
Frame Type (=3)
FQI
Mode Indication (=3)
001110112
Mode Request (=1)
spare
001000003
Codec CRC
CRC(7)CRC(6)CRC(5)CRC(4)CRC(3)CRC(2)CRC(1)CRC(0)4
AMR Core Frame (octet 1)
d(0)d(1)d(2)d(3)d(4)d(5)d(6)d(7)5..19

20
AMR Core Frame (octet 17)
undefined
d(128)d(129)d(130)d(131)d(132)d(133)
Table 6: Mapping of an AMR SID frame into the generic AMR frame, AMR IF1,
example: AMR SID_Update, "good frame", Mode Indication = 3, Mode Request = 2.


MSB
Mapping of bits
AMR SID

LSB
Octet
bit 8bit 7bit 6bit 5bit 4bit 3bit 2bit 11
Frame Type (=8)
FQI
Mode Indication
1
0
0
0
1
undefined
2
Mode Request (=2)
MSB              …               LSB
spare
010000003
Codec CRC
CRC(7)CRC(6)CRC(5)CRC(4)CRC(3)CRC(2)CRC(1)CRC(0)4
AMR Core Frame (octet 1)
d(0)=s(1)d(1)=s(2)d(2)d(3)d(4)d(5)d(6)d(7)5..7

8



STI
Mode Indication (=3)
LSB               …               MSB
undef.
d(32)d(33)d(34) = s(35)1110
Table 7 summarizes all possible AMR frame format combinations in terms of number of bits in each field.
Table 7. Number of bits for different fields in different AMR frame compositions
Frame Type Index Frame Type
Frame Quality IndicatorMode IndicationMode RequestCodec CRCClass AClass BClass CTotal





AMR Core Frame

04133842530114141338495401222413385563013734133858760153441338618701675413387584017864133865994022374133881103602638413383900589413384300621041338380057114133837005612Not used13Not used14Not used15400000004
4.4	GSM-EFR Frame Composition
This subclause contains the description of the generic GSM-EFR Frame of Figure 1. The descriptions for the generic GSM-EFR Frame with speech bits and with comfort noise bit are given separately.
4.4.1	GSM-EFR Frame with speech bits
The generic GSM-EFR frame for speech data bits is formed like for the AMR mode 12.2 kbit/s.
The same Frame Type (Frame Type 7) is used also for GSM-EFR. The Mode Indication and Mode Request fields are set to “7”. The GSM-EFR Core Frame for speech data bits is identical to the AMR Core Frame for speech data bits in the AMR mode with 12.2 kbit/s.
4.4.2	GSM-EFR Frame with comfort noise bits
The GSM-EFR Frame content for the additional frame type with Frame Type Index 9 in Table 1a are described in this subclause. This consists of the frame related to GSM-EFR Comfort Noise Aspects as specified in [4] and [5].
The comfort noise bits are all mapped to Class A. Classes B and C are not used (see Table 7).
The contents of GSM-EFR SID is the Comfort Noise Parameters (s(i)) as defined in [4]. The Comfort noise parameters are computed as described in [5] by the GSM-EFR speech encoder and are denoted as s(i) = {s(1),s(2),...,s(38), s(87),s(88),…,s(91)}. The notation s(i) follows that of [4] (Table 6). The notation d(j) = {d(0) … d(42)} is local to the present document and is formed as defined by the pseudo code below.
for j = 0 to 37
d(j) := s(j+1); /* LSP parameters in s(1) to s(38) */;  
for j = 38 to 42
	 d(j) := s(j+49);  /* fixed codebook  gain parameter in s(87)-s(91) */
Table 8 shows the composition for the generic GSM-EFR SID frame.
Table 8: Mapping of the GSM-EFR SID frame into the generic AMR frame format, AMR IF1,
Example of a good GSM-EFR SID frame (FQI=1).


MSB
Mapping of bits for GSM-EFR SID

LSB
Octet
bit 8bit 7bit 6bit 5bit 4bit 3bit 2bit 11
Frame Type (=9)
FQI
Mode Indication (=7)
100111112
Mode Request (=7)
spare
111000003
Codec CRC
CRC(7)CRC(6)CRC(5)CRC(4)CRC(3)CRC(2)CRC(1)CRC(0)4
Core Frame (octet 1)
d(0)=s(1)d(1)=s(2)d(2)d(3)d(4)d(5)d(6)d(7)5..7

8d(32))d(33)d(34)d(35)d(36)=s(37)d(37)=s(38)d(38)=s(87)d(39)=s(88)9



spare
d(40)=s(89)d(41)=s(90)d(42)=s(91)00000
Annex A (informative):
AMR Interface Format 2 (with octet alignment)
This annex defines an octet-aligned frame format for the AMR codec. This format is useful, for example, when the AMR codec is used in connection with applicable ITU-T H‑series of recommendations. The format is referred to as AMR Interface Format 2 (AMR IF2).
The AMR IF2 frame is formed by concatenation of the 4-bit Frame Type field (as defined for AMR IF1 in subclause 4.1.1) and the AMR Core Frame (as defined for AMR IF1 in subclause 4.2) as shown in figure A.1. The length of the AMR Core Frame field depends on the particular Frame Type. The total number of bits in the AMR IF2 speech frames in the different modes is typically not a multiple of eight and bit stuffing is needed to achieve an octet structure.

Figure A.1: Frame structure for AMR IF2
Table A.1a shows an example how the AMR 6.7 kbit/s mode is mapped into AMR IF2. The four LSBs of the first octet (octet 1) consist of the Frame Type(=3) for the AMR 6.7 kbit/s mode (see table 1a in AMR IF1 specification). This data field is followed by the 134 AMR Core Frame speech bits (d(0)…d(133)) which consist of 58 Class A bits and 76 Class B bits as described in table 2 for AMR IF1. This results in a total of 138 bits and 6 bits are needed for Bit Stuffing to arrive to the closest multiple of 8 which is 144 bits.
Table A.1a: Example mapping of the AMR speech coding mode 6.7kbit/s into AMR IF2.
The bits used for Bit Stuffing are denoted as UB (for "unused bit").

MSB
Mapping of bits
AMR 6.7
LSB
Octetbit 8bit 7bit 6bit 5bit 4bit 3bit 2bit 1
1





Frame Type (= 3)
MSB                         ........                         LSB
d(3)d(2)d(1)d(0)00112d(11)d(10)d(9)d(8)d(7)d(6)d(5)d(4)3…………………d(12)18

Stuffing bits

d(133)
d(132)
UBUBUBUBUBUBd(133)d(132)
Table A.1b shows the composition of AMR IF2 frames for all Frame Types in terms of how many bits are used for each field of figure A.1.
Tables A.2 to A.5 specify how the AMR Core Frame comfort noise bits of Frame Types 8-11 are mapped to AMR IF2. Table A.6 specifies the mapping for an empty frame ("no transmission").
Table A.1b: Composition of AMR IF2 Frames for all Frame Types.
Frame Type Index
Frame content 
Number of bits in Frame Type
Number of Bits in AMR Core Frame
Number of Bits in 
Bit Stuffing
Number of octets (N)
0
AMR 4,75  
4
95
5
13 
1
AMR 5,15
4
103
5
14 
2
AMR 5,90 
4
118
6
16 
3
AMR 6,70
4
134
6
18 
4
AMR 7,40
4
148
0
19
5
AMR 7,95
4
159
5
21 
6
AMR 10,2
4
204
0
26
7
AMR 12,2
4
244
0
31
8
AMR SID
4
39
5
6 
9
GSM-EFR SID
4
43
1
6 
10
TDMA-EFR SID 
4
38
6
6 
11
PDC-EFR SID
4
37
7
6 
12-14
For future use
-
-
-
-
15
No Data
4
0
4
1

Table A.2: Mapping of bits for Frame Type 8 (AMR SID)
(Bits s1 to s35 refer to TS 26.092)

MSB
Mapping of bits
AMR SID
LSB
Octetbit 8bit 7bit 6bit 5bit 4bit 3bit 2bit 1


1
Index of 1st LSF subvector

index of LSF reference vector

Frame Type (= 8)
MSB                     ...........                     LSB
s4s3s2s11000


2
Index of 2nd LSF subvector

index of 1st LSF subvector

s12S11s10s9s8s7s6s5


3

index of 2nd LSF subvector

s20S19s18s17s16s15s14s13


4

index of 3rd LSF subvector

s28s27s26s25s24s23s22s21


5
SID Type Indicator
 

frame energy
index of 3rd LSF subvector
t1s35s34s33s32s31s30s29


6

Stuffing bits


Mode Indication
MSB             mi(i)              LSB
UBUBUBUBUBmi(2)mi(1)mi(0)
Definitions of additional descriptor bits needed for the silence descriptor in the table are as follows: SID-type Indicator STI is {0=SID_FIRST, 1=SID_UPDATE }, Mode Indication (mi(0)- mi(2)) is the AMR codec mode according to the first eight entries in table 1a.
Table A.3: Mapping of bits for Frame Type 9 (GSM-EFR SID)
 (Bits s1 to s91 refer to GSM 46.060)

MSB
Mapping of bits
GSM-EFR SID
LSB
Octetbit 8bit 7bit 6bit 5bit 4bit 3bit 2bit 1


1

Index of 1st LSF subMatrix

Frame Type (= 9) 

s4s3s2s11001


2

Index of 2nd LSF submatrix

index of 1st LSF subMatrix

s12s11s10s9s8s7s6s5


3

Index of 3rd LSF submatrix


Index of 2nd LSF submatrix
s20s19s18s17s16s15s14s13


4

index of 4th LSF submatrix
sign of 3rd LSF submatrix

index of 3rd LSF submatrix
s28s27s26s25s24s23s22s21

5

index of 5th LSF submatrix

index of 4th LSF submatrix

s36s35s34s33s32s31s30s29


6
Stuffing bit


fixed codebook gain
index of 5th LSF submatrix
UBs91s90s89s88s87s38s37
Table A.4: Mapping of bits for Frame Type 10 (TDMA-EFR SID)
 (Bits cn0 to cn37 refer to IS-641-A)

MSB
Mapping of bits
TDMA-EFR SID
LSB
Octetbit 8bit 7bit 6bit 5bit 4bit 3bit 2bit 1


1

Index of 1st LSF subvector
 

Frame Type (= 10) 
cn3cn2cn1cn01010


2

Index of 2nd LSF subvector


index of 1st LSF subvector
cn11Cn10cn9cn8cn7cn6cn5cn4


3

Index of 3rd LSF subvector 


Index of 2nd LSF subvector
cn19cn18cn17cn16cn15cn14cn13cn12


4

Random Excitation Gain


index of 3rd LSF subvector
cn27cn26cn25cn24cn23cn22cn21cn20


5
Index of 1st RESC parameter


Random Excitation Gain
cn35cn34cn33cn32cn31cn30cn29cn28


6

Stuffing bits

Index of 2nd RESC parameter
UBUBUBUBUBUBcn37cn36
Table A.5: Mapping of bits for Frame Type 11 (PDC-EFR SID) 
(Bits s1 to s35 refer to ARIB xx)

MSB
Mapping of bits
PDC-EFR SID
LSB
Octetbit 8bit 7bit 6bit 5bit 4bit 3bit 2bit 1


1
index of 1st LSF subvector

index of LSF reference vector

Frame Type (= 11) 
s4s3s2s11011


2
index of 2nd LSF subvector

index of 1st LSF subvector
s12s11s10s9s8s7s6s5


3

index of 2nd LSF subvector

s20s19s18s17s16s15s14s13


4

index of 3rd LSF subvector

s28s27s26s25s24s23s22s21


5

SID type 

frame energy
Index of 3rd LSF subvector
t1s35s34s33s32s31s30s29


6

Stuffing bits


SID type 
UBUBUBUBUBUBUBt2
Definition of additional descriptor bits needed for the table is as follows: SID‑type is {0=POST0, 1=POST1(SID_UPDATE), 2=PRE, 3=POST1_BAD }, where LSB of SID_type is t1 and MSB of SID-type is t2.
Table A.6: Mapping of bit for Frame Type 15 (No Data)

MSB
Mapping of Bits
No Data
LSB
Octetbit 8bit 7bit 6bit 5bit 4bit 3bit 2bit 1


1

Stuffing bits


Frame Type (= 15) 
UBUBUBUB1111
Annex B (normative):
Tables for AMR Core Frame bit ordering
This annex contains the tables required for ordering the AMR Core Frame speech bits corresponding to the different AMR modes. These tables represent tablem(j) in subclause 4.2.1 where m=0..7 is the AMR mode. The tables are read from left to right so that the first element (top left corner) of the table has index 0 and the last element (the rightmost element of the last row) has the index K-1 where K is the total number of speech bits in the specific mode. For example, table0(20)=27, as defined in table B.1.
Table B.1: Ordering of the speech encoder bits for the 4.75 kbit/s mode: table0(j)
j=0j=1j=2.....................0 1 2 3 4 5 6 7 8 9   10 11 12 13 14 15 23 24 25 26   27 28 48 49 61 62 82 83 47 46   45 44 81 80 79 78 17 18 20 22   77 76 75 74 29 30 43 42 41 40   38 39 16 19 21 50 51 59 60 63   64 72 73 84 85 93 94 32 33 35   36 53 54 56 57 66 67 69 70 87   88 90 91 34 55 68 89 37 58 71   92 31 52 65 86
Table B.2: Ordering of the speech encoder bits for the 5.15 kbit/s mode: table1(j)
     7   6   5   4   3   2   1   0  15  14    13  12  11  10   9   8  23  24  25  26    27  46  65  84  45  44  43  64  63  62    83  82  81 102 101 100  42  61  80  99    28  47  66  85  18  41  60  79  98  29    48  67  17  20  22  40  59  78  97  21    30  49  68  86  19  16  87  39  38  58    57  77  35  54  73  92  76  96  95  36    55  74  93  32  51  33  52  70  71  89    90  31  50  69  88  37  56  75  94  34    53  72  91
Table B.3: Ordering of the speech encoder bits for the 5.9 kbit/s mode: table2(j)
     0   1   4   5   3   6   7   2  13  15     8   9  11  12  14  10  16  28  74  29    75  27  73  26  72  30  76  51  97  50    71  96 117  31  77  52  98  49  70  95   116  53  99  32  78  33  79  48  69  94   115  47  68  93 114  46  67  92 113  19    21  23  22  18  17  20  24 111  43  89   110  64  65  44  90  25  45  66  91 112    54 100  40  61  86 107  39  60  85 106    36  57  82 103  35  56  81 102  34  55    80 101  42  63  88 109  41  62  87 108    38  59  84 105  37  58  83 104
Table B.4: Ordering of the speech encoder bits for the 6.7 kbit/s mode: table3(j)
       0   1   4   3   5   6  13   7   2   8     9  11  15  12  14  10  28  82  29  83    27  81  26  80  30  84  16  55 109  56   110  31  85  57 111  48  73 102 127  32    86  51  76 105 130  52  77 106 131  58   112  33  87  19  23  53  78 107 132  21    22  18  17  20  24  25  50  75 104 129    47  72 101 126  54  79 108 133  46  71   100 125 128 103  74  49  45  70  99 124    42  67  96 121  39  64  93 118  38  63    92 117  35  60  89 114  34  59  88 113    44  69  98 123  43  68  97 122  41  66    95 120  40  65  94 119  37  62  91 116    36  61  90 115
Table B.5: Ordering of the speech encoder bits for the 7.4 kbit/s mode: table4(j)
0 1 2 3 4 5 6 7 8 9  10 11 12 13 14 15 16 26 87 27  88 28 89 29 90 30 91 51 80 112  141 52 81 113 142 54 83 115 144 55  84 116 145 58 119 59 120 21 22 23  17 18 19 31 60 92 121 56 85 117  146 20 24 25 50 79 111 140 57 86  118 147 49 78 110 139 48 77 53 82  114 143 109 138 47 76 108 137 32 33  61 62 93 94 122 123 41 42 43 44  45 46 70 71 72 73 74 75 102 103  104 105 106 107 131 132 133 134 135 136  34 63 95 124 35 64 96 125 36 65  97 126 37 66 98 127 38 67 99 128  39 68 100 129 40 69 101 130
Table B.6: Ordering of the speech encoder bits for the 7.95 kbit/s mode: table5(j)
     8   7   6   5   4   3   2  14  16   9    10  12  13  15  11  17  20  22  24  23    19  18  21  56  88 122 154  57  89 123   155  58  90 124 156  52  84 118 150  53    85 119 151  27  93  28  94  29  95  30    96  31  97  61 127  62 128  63 129  59    91 125 157  32  98  64 130   1   0  25    26  33  99  34 100  65 131  66 132  54    86 120 152  60  92 126 158  55  87 121   153 117 116 115  46  78 112 144  43  75   109 141  40  72 106 138  36  68 102 134   114 149 148 147 146  83  82  81  80  51    50  49  48  47  45  44  42  39  35  79    77  76  74  71  67 113 111 110 108 105   101 145 143 142 140 137 133  41  73 107   139  37  69 103 135  38  70 104 136
Table B.7: Ordering of the speech encoder bits for the 10.2 kbit/s mode: table6(j)
   7 6 5 4 3 2 1 0 16 15   14 13 12 11 10 9 8 26 27 28   29 30 31 115 116 117 118 119 120 72   73 161 162 65 68 69 108 111 112 154   157 158 197 200 201 32 33 121 122 74   75 163 164 66 109 155 198 19 23 21   22 18 17 20 24 25 37 36 35 34   80 79 78 77 126 125 124 123 169 168   167 166 70 67 71 113 110 114 159 156   160 202 199 203 76 165 81 82 92 91   93 83 95 85 84 94 101 102 96 104   86 103 87 97 127 128 138 137 139 129   141 131 130 140 147 148 142 150 132 149   133 143 170 171 181 180 182 172 184 174   173 183 190 191 185 193 175 192 176 186   38 39 49 48 50 40 52 42 41 51   58 59 53 61 43 60 44 54 194 179   189 196 177 195 178 187 188 151 136 146   153 134 152 135 144 145 105 90 100 107   88 106 89 98 99 62 47 57 64 45   63 46 55 56
Table B.8: Ordering of the speech encoder bits for the 12.2 kbit/s mode: table7(j)
     0   1   2   3   4   5   6   7   8   9    10  11  12  13  14  23  15  16  17  18    19  20  21  22  24  25  26  27  28  38   141  39 142  40 143  41 144  42 145  43   146  44 147  45 148  46 149  47  97 150   200  48  98 151 201  49  99 152 202  86   136 189 239  87 137 190 240  88 138 191   241  91 194  92 195  93 196  94 197  95   198  29  30  31  32  33  34  35  50 100   153 203  89 139 192 242  51 101 154 204    55 105 158 208  90 140 193 243  59 109   162 212  63 113 166 216  67 117 170 220    36  37  54  53  52  58  57  56  62  61    60  66  65  64  70  69  68 104 103 102   108 107 106 112 111 110 116 115 114 120   119 118 157 156 155 161 160 159 165 164   163 169 168 167 173 172 171 207 206 205   211 210 209 215 214 213 219 218 217 223   222 221  73  72  71  76  75  74  79  78    77  82  81  80  85  84  83 123 122 121   126 125 124 129 128 127 132 131 130 135   134 133 176 175 174 179 178 177 182 181   180 185 184 183 188 187 186 226 225 224   229 228 227 232 231 230 235 234 233 238   237 236  96 199
Annex C (informative):
Change history
Change history
DateTSG SA#TSG Doc.CRRevSubject/CommentOldNew1999-126SP-990562Approved at TSG-SA#6 Plenary3.0.02000-037SP-000025001Correction of indices in Annex B table3.0.03.1.02000-037SP-000025002Addition of comfort noise bit ordering3.0.03.1.02000-037SP-000025003Correction of table indexing for AMR Core Frame class division3.0.03.1.02000-037SP-000025004Clarification of bit transmission order for AMR frame structure parameters for AMR Interface Format 1 (AMR IF1)3.0.03.1.02001-0311Version for Release 44.0.02001-0612SP-010305006Correction to SID Frame Mapping4.0.04.1.02002-0315SP-020077008Correction of AMR codec output bitstream4.1.04.2.02002-0616Version for Release 54.2.05.0.02004-0925SP-0406440092Generic Frame Structure for GSM-EFR SID5.0.06.0.02004-0925SP-0406440101Error Corrections5.0.06.0.02007-0636Version for Release 76.0.07.0.02008-1242Version for Release 87.0.08.0.02009-1246Version for Release 98.0.09.0.0




















 STYLEREF ZA 3GPP TS 26.101 V9.0.0 (2009-12)
 PAGE 3
 STYLEREF ZGSM Release 9


3GPP