26101b00speech codec frame structure.docx

26101b00speech codec frame structure.docx

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26101b00speechcodecframestructure

3GPPTS26.101V11.0.0（2012-09）

TechnicalSpecification

3rdGenerationPartnershipProject;

TechnicalSpecificationGroupServicesandSystemAspects;

Mandatoryspeechcodecspeechprocessingfunctions;

AdaptiveMulti-Rate（AMR）speechcodecframestructure

（Release11）

Thepresentdocumenthasbeendevelopedwithinthe3rdGenerationPartnershipProject（3GPPTM）andmaybefurtherelaboratedforthepurposesof3GPP.

Thepresentdocumenthasnotbeensubjecttoanyapprovalprocessbythe3GPPOrganizationalPartnersandshallnotbeimplemented.

ThisSpecificationisprovidedforfuturedevelopmentworkwithin3GPPonly.TheOrganizationalPartnersacceptnoliabilityforanyuseofthisSpecification.

Specificationsandreportsforimplementationofthe3GPPTMsystemshouldbeobtainedviathe3GPPOrganizationalPartners'PublicationsOffices.

Keywords

GSM,UMTS,codec,AMR,LTE

3GPP

Postaladdress

3GPPsupportofficeaddress

650RoutedesLucioles-SophiaAntipolis

Valbonne-FRANCE

Tel.:

+33492944200Fax:

+33493654716

Internet

http:

//www.3gpp.org

CopyrightNotification

Nopartmaybereproducedexceptasauthorizedbywrittenpermission.

Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.

©2012,3GPPOrganizationalPartners（ARIB,ATIS,CCSA,ETSI,TTA,TTC）.

Allrightsreserved.

UMTS™isaTradeMarkofETSIregisteredforthebenefitofitsmembers

3GPP™isaTradeMarkofETSIregisteredforthebenefitofitsMembersandofthe3GPPOrganizationalPartners

LTE™isaTradeMarkofETSIcurrentlybeingregisteredforthebenefitofitsMembersandofthe3GPPOrganizationalPartners

GSM®andtheGSMlogoareregisteredandownedbytheGSMAssociation

Contents

Foreword4

1Scope5

2References5

3DefinitionsandAbbreviations5

3.1Definitions5

3.2Abbreviations5

4AMRcodecframeformat（AMRIF1）6

4.1AMRHeaderandAMRAuxiliaryInformation6

4.1.1FrameType,ModeIndication,andModeRequest6

4.1.2FrameQualityIndicator7

4.1.3MappingtoTX_TYPEandRX_TYPE7

4.1.4CodecCRC8

4.2AMRCoreFrame8

4.2.1AMRCoreFramewithspeechbits:

Bitordering8

4.2.2AMRCoreFramewithspeechbits:

Classdivision9

4.2.3AMRCoreFramewithcomfortnoisebits9

4.3AMRframecomposition10

4.4GSM-EFRFrameComposition11

4.4.1GSM-EFRFramewithspeechbits12

4.4.2GSM-EFRFramewithcomfortnoisebits12

AnnexA（informative）:

AMRInterfaceFormat2（withoctetalignment）13

AnnexB（normative）:

TablesforAMRCoreFramebitordering17

AnnexC（informative）:

Changehistory20

Foreword

ThisTechnicalSpecificationhasbeenproducedbythe3rdGenerationPartnershipProject（3GPP）.

ThecontentsofthepresentdocumentaresubjecttocontinuingworkwithintheTSGandmaychangefollowingformalTSGapproval.ShouldtheTSGmodifythecontentsofthepresentdocument,itwillbere-releasedbytheTSGwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:

Versionx.y.z

where:

xthefirstdigit:

1presentedtoTSGforinformation;

2presentedtoTSGforapproval;

3orgreaterindicatesTSGapproveddocumentunderchangecontrol.

ytheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.

zthethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthedocument.

1Scope

ThepresentdocumentdescribesagenericframeformatfortheAdaptiveMulti-Rate（AMR）speechcodecandtheEnhancedFullRate（GSM-EFR）speechcodec.Thisformatshallbeusedasacommonreferencepointwheninterfacingspeechframesbetweendifferentelementsofthe3Gsystemandbetweendifferentsystems.Appropriatemappingstoandfromthisgenericframeformatwillbeusedwithinandbetweeneachsystemelement.

AnnexAdescribesasecondframeformatwhichshallbeusedwhenoctetalignmentofAMRframesisrequired.

2References

Thefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.

∙Referencesareeitherspecific（identifiedbydateofpublication,editionnumber,versionnumber,etc.）ornonspecific.

∙Foraspecificreference,subsequentrevisionsdonotapply.

∙Foranon-specificreference,thelatestversionapplies.Inthecaseofareferencetoa3GPPdocument（includingaGSMdocument）,anon-specificreferenceimplicitlyreferstothelatestversionofthatdocumentinthesameReleaseasthepresentdocument.

[1]TS 26.090:

"AMRSpeechCodec;SpeechTranscodingFunctions".

[2]TS 26.093:

"AMRSpeechCodec;SourceControlledRateOperation".

[3]TS 26.092:

"AMRSpeechCodec;ComfortNoiseAspects".

[4]TS 46.060:

"EFRSpeechCodec;SpeechTranscodingFunctions".

[5]TS 46.062:

"EFRSpeechCodec;ComfortNoiseAspects".

3DefinitionsandAbbreviations

3.1Definitions

Forthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:

AMRmode:

oneoftheeightAMRcodecbit-ratesdenotedalsowithindices0to7where0mapstothe4.75kbis/smodeand7mapstothe12.2 kbit/smode.

AMRcodecmode:

sameasAMRmode.

RX_TYPE:

classificationofthereceivedframeasdefinedin[2].

TX_TYPE:

classificationofthetransmittedframeasdefinedin[2].

3.2Abbreviations

Forthepurposesofthepresentdocument,thefollowingabbreviationsapply:

CRCCyclicRedundancyCheck

FQIFrameQualityIndicator

GSMGlobalSystemforMobilecommunication

LSBLeastSignificantBit

MSBMostSignificantBit

RXReceive

PDCPersonalDigitalCommunication（ARIBstandard）

SCRSourceControlledRateoperation

SIDSilenceDescriptor（ComfortNoiseFrame）

TDMATimeDivisionMultipleAccess（IS-641）

TXTransmit

4AMRcodecframeformat（AMRIF1）

ThisclausedescribesthegenericframeformatforboththespeechandcomfortnoiseframesoftheAMRspeechcodec.ThisformatisreferredtoasAMRInterfaceFormat1（AMRIF1）.AnnexAdescribesAMRInterfaceFormat 2（AMR IF2）.

EachAMRcodecmodefollowsthegenericframestructuredepictedinfigure1.Theframeisdividedintothreeparts:

AMRHeader,AMRAuxiliaryInformation,andAMRCoreFrame.TheAMRHeaderpartincludestheFrameTypeandtheFrameQualityIndicatorfields.TheAMRauxiliaryinformationpartincludestheModeIndication,ModeRequest,andCodecCRCfields.TheAMRCoreFramepartconsistsofthespeechparameterbitsor,incaseofacomfortnoiseframe,thecomfortnoiseparameterbits.Incaseofacomfortnoiseframe,thecomfortnoiseparametersreplaceClassAbitsofAMRCoreFramewhileClassBandCbitsareomitted.

Figure1:

GenericAMRframestructure

4.1AMRHeaderandAMRAuxiliaryInformation

ThissubclausedescribestheAMRHeaderoffigure 1.

4.1.1FrameType,ModeIndication,andModeRequest

Table1adefinesthe4-bitFrameTypefield.FrameTypecanindicatetheuseofoneoftheeightAMRcodecmodes,oneoffourdifferentcomfortnoiseframes,oranemptyframe.Inaddition,threeFrameTypeIndicesarereservedforfutureuse.ThesametableisreusedfortheModeIndicationandModeRequestfieldswhichare3-bitfieldseachandaredefinedonlyintherange0…7tospecifyoneoftheeightAMRcodecmodes.

Table1a:

InterpretationofFrameType,

ModeIndicationandModeRequestfields

FrameType

ModeIndication

ModeRequest

Framecontent（AMRmode,comfortnoise,orother）

0

0

0

AMR4,75kbit/s

1

1

1

AMR5,15kbit/s

2

2

2

AMR5,90kbit/s

3

3

3

AMR6,70kbit/s（PDC-EFR）

4

4

4

AMR7,40kbit/s（TDMA-EFR）

5

5

5

AMR7,95kbit/s

6

6

6

AMR10,2kbit/s

7

7

7

AMR12,2kbit/s（GSM-EFR）

8

-

-

AMRSID

9

-

-

GSM-EFRSID

10

-

-

TDMA-EFRSID

11

-

-

PDC-EFRSID

12-14

-

-

Forfutureuse

15

-

-

NoData（Notransmission/Noreception）

4.1.2FrameQualityIndicator

ThecontentoftheFrameQualityIndicatorfieldisdefinedinTable1b.Thefieldlengthisonebit.TheFrameQualityIndicatorindicateswhetherthedataintheframecontainserrors.

Table1b:

DefinitionofFrameQualityIndicator

FrameQualityIndicator（FQI）

Qualityofdata

0

BadframeorCorruptedframe

（bitsmaybeusedtoassisterrorconcealment）

1

Goodframe

4.1.3MappingtoTX_TYPEandRX_TYPE

Table 1cshowshowtheAMRHeaderdata（FQIandFrameType）mapstotheTX_TYPEandRX_TYPEframesdefinedin[2].

Table1c:

MappingofFrameQualityIndicatorandFrameTypeto

TX_TYPEandRX_TYPE[2],respectively

FrameQualityIndicator

FrameTypeIndex

TX_TYPEor

RX_TYPE

Comment

1

0-7

SPEECH_GOOD

ThespecificFrameTypeIndexdependsonthebit-ratebeingused.

0

0-7

SPEECH_BAD

ThespecificFrameTypeIndexdependsonthebit-ratebeingused.Thecorrupteddatamaybeusedtoassisterrorconcealment.

1

8

8

SID_FIRSTor

SID_UPDATE

ForAMR:

SID_FIRSTandSID_UPDATE

aredifferentiatedusingoneClass Abit:

STI.

0

8

SID_BAD

ForAMR

1

9

GSM-EFRSID

ForGSM-EFR

0

9

GSM-EFRSID_BAD

ForGSM-EFR

1

10-11

SID_UPDATE

ForTDMA-EFRandPDC-EFR

0

10-11

SID_BAD

ForTDMA-EFRandPDC-EFR

1

15

NO_DATA

Typicallyanon-transmittedframeoranerasedorstolenframewithnodatausabletoassisterrorconcealment.

4.1.4CodecCRC

GenericAMRcodecframeswithFrameType 0.11areassociatedwithan8-bitCRCforerror-detectionpurposes.TheCodecCRCfieldofAMRAuxiliaryInformationinfigure 1containsthevalueofthisCRC.Theseeightparitybitsaregeneratedbythecyclicgeneratorpolynomial:

-G（x）=D8+D6+D5+D4+1

whichiscomputedoverallClass AbitsofAMRCoreFrame.Class AbitsforFrameTypes0.7aredefinedinsubclause 4.2.2（forspeechbits）andforFrameTypes8.11insubclause 4.2.3（forcomfortnoisebits）.

WhenFrameTypeIndexoftable