26071b00General description.docx

26071b00General description.docx

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26071b00Generaldescription

3GPPTS26.071V11.0.0（2012-09）

TechnicalSpecification

3rdGenerationPartnershipProject;

TechnicalSpecificationGroupServicesandSystemAspects;

MandatoryspeechCODECspeechprocessingfunctions;

AMRspeechCODEC;Generaldescription

（Release11）

Thepresentdocumenthasbeendevelopedwithinthe3rdGenerationPartnershipProject（3GPPTM）andmaybefurtherelaboratedforthepurposesof3GPP.

Thepresentdocumenthasnotbeensubjecttoanyapprovalprocessbythe3GPPOrganizationalPartnersandshallnotbeimplemented.

ThisSpecificationisprovidedforfuturedevelopmentworkwithin3GPPonly.TheOrganizationalPartnersacceptnoliabilityforanyuseofthisSpecification.

Specificationsandreportsforimplementationofthe3GPPTMsystemshouldbeobtainedviathe3GPPOrganizationalPartners'PublicationsOffices.

Keywords

GSM,UMTS,codec,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

3Definitionsandabbreviations6

3.1Abbreviations6

4General6

5AdaptiveMulti-Ratespeechcodectranscodingfunctions8

6AdaptiveMulti-RatespeechcodecANSIC-code8

7AdaptiveMulti-Ratespeechcodectestvectors8

8AdaptiveMulti-Ratespeechcodecsourcecontrolledrateoperation9

9AdaptiveMulti-Ratespeechcodecvoiceactivitydetection9

10AdaptiveMulti-Ratespeechcodeccomfortnoiseinsertion10

11AdaptiveMulti-Ratespeechcodecerrorconcealmentoflostframes10

12AdaptiveMulti-Ratespeechcodecframestructure10

13AdaptiveMulti-RatespeechcodecinterfacetoRAN10

14AdaptiveMulti-Ratespeechcodecperformancecharacterisation11

AnnexA（informative）:

Changehistory12

Foreword

ThisTechnicalSpecificationhasbeenproducedbythe3rdGenerationPartnershipProject（3GPP）.

ThecontentsofthepresentdocumentaresubjecttocontinuingworkwithintheTSGandmaychangefollowingformalTSGapproval.ShouldtheTSGmodifythecontentsofthepresentdocument,itwillbere-releasedbytheTSGwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:

Versionx.y.z

where:

xthefirstdigit:

1presentedtoTSGforinformation;

2presentedtoTSGforapproval;

3orgreaterindicatesTSGapproveddocumentunderchangecontrol.

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

zthethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthedocument.

1Scope

ThepresentdocumentisanintroductiontothespeechprocessingpartsofthenarrowbandtelephonyspeechserviceemployingtheAdaptiveMulti-Rate（AMR）speechcoder.Ageneraloverviewofthespeechprocessingfunctionsisgiven,withreferencetothedocumentswhereeachfunctionisspecifiedindetail.

2References

Thefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.

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

∙Foraspecificreference,subsequentrevisionsdonotapply.

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

[1]GSM 03.50:

"Digitalcellulartelecommunicationssystem（Phase 2）;TransmissionplanningaspectsofthespeechserviceintheGSMPublicLandMobileNetwork（PLMN）system".

[2]3GPPTS 26.090:

"Transcodingfunctions".

[3]3GPPTS 26.073:

"AdaptiveMulti-Rate（AMR）;ANSICsourcecode".

[4]3GPPTS 26.074:

"AdaptiveMulti-Rate（AMR）;Testsequences".

[5]3GPPTS 26.093:

"SourceControlledRateoperation".

[6]3GPPTS 26.094:

"AMRSpeechCodec;VoiceActivityDetector".

[7]3GPPTS 26.092:

"MandatorySpeechCodecspeechprocessingfunctions;AMRSpeechCodec;Comfortnoiseaspects".

[8]3GPPTS 26.091:

"MandatorySpeechCodecspeechprocessingfunctions;AMRSpeechCodec;Errorconcealmentoflostframes".

[9]3GPPTS 26.101:

"FrameStructure".

[10]3GPPTS 26.102:

"AMRSpeechCodec;InterfacetoIusndUu".

[11]3GPPTS 26.901:

"AMRwidebandspeechcodecfeasibilitystudyreport".

[12]ITU-TRecommendationG.711:

"Pulsecodemodulation（PCM）ofvoicefrequencies".

[13]ITU-TRecommendationH.324:

"Terminalforlowbit-ratemultimediacommunication".

3Definitionsandabbreviations

3.1Abbreviations

ForthepurposesofthisTS,thefollowingabbreviationsapply:

ACELPAlgebraicCodeExcitedLinearPrediction

AMRAdaptiveMulti-Rate

BFIBadFrameIndication

CHDChannelDecoder

CHEChannelEncoder

GSMGlobalSystemforMobilecommunications

ITU-TInternationalTelecommunicationUnion–Telecommunicationstandardisationsector（formerCCITT）

PCMPulseCodeModulation

PLMNPublicLandMobileNetwork

PSTNPublicSwitchedTelephoneNetwork

RXReceive

SCRSourceControlledRate

SPDSPeechDecoder

SPESPeechEncoder

TCTranscoder

TXTransmit

UEUserEquipment（terminal）

4General

TheAMRspeechcoderconsistsofthemulti-ratespeechcoder,asourcecontrolledrateschemeincludingavoiceactivitydetectorandacomfortnoisegenerationsystem,andanerrorconcealmentmechansimtocombattheeffectsoftransmissionerrorsandlostpackets.

Themulti-ratespeechcoderisasingleintegratedspeechcodecwitheightsourceratesfrom4.75kbit/sto12.2kbit/s,andalowratebackgroundnoiseencodingmode.Thespeechcoderiscapableofswitchingitsbit-rateevery20msspeechframeuponcommand.

AreferenceconfigurationwherethevariousspeechprocessingfunctionsareidentifiedisgiveninFigure1.Inthisfigure,therelevantspecificationsforeachfunctionarealsoindicated.

InFigure1,theaudiopartsincludinganaloguetodigitalanddigitaltoanalogueconversionareincluded,toshowthecompletespeechpathbetweentheaudioinput/outputintheUserEquipment（UE）andthedigitalinterfaceofthenetwork.Thedetailedspecificationoftheaudiopartsisnotwithinthescopeofthepresentdocument.Theseaspectsareonlyconsideredtotheextentthattheperformanceoftheaudiopartsaffecttheperformanceofthespeechtranscoder.

Figure1:

Overviewofaudioprocessingfunctions

1）8bitAlaworμ-lawPCM（ITU-TRecommendationG.711[12]）,8000samples/s;

2）13bituniformPCM,8000samples/s;

3）VoiceActivityDetector（VAD）flag;

4）Encodedspeechframe,50frames/s,numberofbits/framedependingontheAMRcodecmode;

5）SIlenceDescriptor（SID）frame;

6）TX_TYPE,2bits,indicateswhetherinformationbitsareavailableandiftheyarespeechorSIDinformation;

7）Informationbitsdeliveredtothe3GAN;

8）Informationbitsreceivedfromthe3GAN;

9）RX_TYPE,thetypeofframereceivedquantizedintothreebits.

5AdaptiveMulti-Ratespeechcodectranscodingfunctions

Theadaptivemulti-ratespeechcodecisdescribedin[2].Thetechnicalcontentisidenticaltothatof3GPPTS26.090.

AsshowninFigure1,thespeechencodertakesitsinputasa13bituniformPulseCodeModulated（PCM）signaleitherfromtheaudiopartoftheUEoronthenetworkside,fromthePublicSwitchedTelephoneNetwork（PSTN）viaan8-bitA-laworμ-lawto13-bituniformPCMconversion.Theencodedspeechattheoutputofthespeechencoderispacketizedanddeliveredtothenetworkinterface.Inthereceivedirection,theinverseoperationstakeplace.

Thedetailedmappingbetweeninputblocksof160speechsamplesin13bituniformPCMformattoencodedblocks（inwhichthenumberofbitsdependsonthepresentlyusedcodecmode）andfromthesetooutputblocksof160reconstructedspeechsamplesisdescribedin[2].ThecodingschemeisMulti-RateAlgebraicCodeExcitedLinearPrediction.Thebit-ratesofthesourcecodecarelistedinTable1.

AnAMRspeechcodeccapableUEshallsupportallsourcerateslistedinTable1.

Table1:

Sourcecodecbit-ratesfortheAMRcodec.

Codecmode

Sourcecodecbit-rate

AMR_12.20

12,20kbit/s（GSMEFR）

AMR_10.20

10,20kbit/s

AMR_7.95

7,95kbit/s

AMR_7.40

7,40kbit/s（IS-641）

AMR_6.70

6,70kbit/s（PDC-EFR）

AMR_5.90

5,90kbit/s

AMR_5.15

5,15kbit/s

AMR_4.75

4,75kbit/s

AMR_SID

1,80kbit/s（seenote1）

NOTE1:

AssumingSIDframesarecontinouslytransmitted

NOTE2:

GSM-EFRisthe3GPPTS26.090EnhancedFullRateSpeechCodec（also

identicaltotheTIATDMA-US1Enhancedspeechcodec）

NOTE3:

IS-641istheTIA/EIAIS-641TDMAEnhancedFullRateSpeechCodec

NOTE4:

PDC-EFRistheARIB6.7kbit/sEnhancedFullRateSpeechCodec

6AdaptiveMulti-RatespeechcodecANSIC-code

TheANSI-Ccodeofthespeechcodec,VADandCNGsystemaredescribedin[3].TheANSIC-codeismandatory.TheANSIC-codeisidenticaltothatof3GPPTS26.073[3].

7AdaptiveMulti-Ratespeechcodectestvectors

Asetofdigitaltestsequencesisspecifiedin[4],thusenablingtheverif