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SIST EN 300 728 V7.0.1:2003

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Digital cellular telecommunications system (Phase 2+) (GSM); Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.62 version 7.0.1 Release 1998)

Digital cellular telecommunications system (Phase 2+) (GSM); Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.62 version 7.0.1 Release 1998)

Upgrade from Phase 2+ to Release 1998

Digitalni celični telekomunikacijski sistem (faza 2+) – Vidiki znosnega šuma v kanalih za izboljšani polnohitrostni (EFR) govorni promet (GSM 06.62, različica 7.0.1, izdaja 1998)

General Information

Status
Published
Publication Date
30-Nov-2003
ICS
33.070.50 - Global System for Mobile Communication (GSM)
Technical Committee
SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Dec-2003
Due Date
01-Dec-2003
Completion Date
01-Dec-2003
Mandate
T-172
Ref Project
ETSI EN 300 728 V7.0.1 (2000-01) - Digital cellular telecommunications system (Phase 2+) (GSM); Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.62 version 7.0.1 Release 1998)

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EN 300 728 V7.0.1:2003EN 300 728 V7.0.1:2003
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EN 300 728 V7.0.1:2003
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.62 version 7.0.1 Release 1998)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 728 Version 7.0.1SIST EN 300 728 V7.0.1:2003en01-december-2003SIST EN 300 728 V7.0.1:2003SLOVENSKI
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SIST EN 300 728 V7.0.1:2003



ETSIEN300728V7.0.1(2000-01)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);ComfortnoiseaspectsforEnhancedFullRate(EFR)speechtrafficchannels(GSM06.62version7.0.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 728 V7.0.1:2003



ETSIETSIEN300728V7.0.1(2000-01)2(GSM06.62version7.0.1Release1998)ReferenceREN/SMG-020662Q7KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88Internetsecretariat@etsi.frIndividualcopiesofthisETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frImportantnoticeThisETSIdeliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 728 V7.0.1:2003



ETSIETSIEN300728V7.0.1(2000-01)3(GSM06.62version7.0.1Release1998)ContentsIntellectualPropertyRights.4Foreword.41Scope.52References.53Definitions,symbolsandabbreviations.53.1Definitions.53.2Symbols.63.3Abbreviations.74General.75Functionsonthetransmit(TX)side.75.1Backgroundacousticnoiseevaluation.85.2ModificationofthespeechencodingalgorithmduringSIDframegeneration.115.3SID-frameencoding.126Functionsonthereceive(RX)side.126.1AveraginganddecodingoftheLPandfixedcodebookgainparameters.136.2Comfortnoisegenerationandupdating.147Computationaldetails.15AnnexA(informative):ChangeRequestHistory.16History.17SIST EN 300 728 V7.0.1:2003



ETSIETSIEN300728V7.0.1(2000-01)4(GSM06.62version7.0.1Release1998)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbytheSpecialMobileGroup(SMG).Thepresentdocumentdefinesoperationofthebackgroundacousticnoiseevaluation,noiseparameterencoding/decodingandcomfortnoisegenerationinMobileStations(MSs)andBaseStationSystems(BSSs)duringDiscontinuousTransmission(DTX)onEnhancedFullRatespeechtrafficchannelswithinthedigitalcellulartelecommunicationssystem.ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7indicatesRelease1998ofGSMPhase2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:31December1999DateoflatestannouncementofthisEN(doa):31March2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30September2000DateofwithdrawalofanyconflictingNationalStandard(dow):30September2000SIST EN 300 728 V7.0.1:2003



ETSIETSIEN300728V7.0.1(2000-01)5(GSM06.62version7.0.1Release1998)1ScopeThepresentdocumentgivesthedetailedrequirementsforthecorrectoperationofthebackgroundacousticnoiseevaluation,noiseparameterencoding/decodingandcomfortnoisegenerationinMobileStations(MSs)andBaseStationSystems(BSSs)duringDiscontinuousTransmission(DTX)onEnhancedFullRatespeechtrafficchannels.TherequirementsdescribedinthepresentdocumentaremandatoryforimplementationinallGSMMSscapableofsupportingtheEnhancedFullRatespeechtrafficchannel.ThereceiverrequirementsaremandatoryforimplementationinallGSMBSSscapableofsupportingtheEnhancedFullRatespeechtrafficchannel,thetransmitterrequirementsonlyforthosewheredownlinkDTXwillbeused.IncaseofdiscrepancybetweentherequirementsdescribedinthepresentdocumentandthefixedpointcomputationaldescriptionoftheserequirementscontainedinGSM06.53[2],thedescriptioninGSM06.53[2]willprevail.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.•Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.•Foraspecificreference,subsequentrevisionsdonotapply.•Foranon-specificreference,thelatestversionapplies.•Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.•ForthisRelease1998document,referencestoGSMdocumentsareforRelease1998versions(version7.x.y).[1]GSM01.04:"Digitalcellulartelecommunicationssystem(Phase2+);Abbreviationsandacronyms".[2]GSM06.53:"Digitalcellulartelecommunicationssystem(Phase2+);ANSI-CcodefortheGSMEnhancedFullRate(EFR)speechcodec".[3]GSM06.60:"Digitalcellulartelecommunicationssystem(Phase2+);EnhancedFullRate(EFR)speechtranscoding".[4]GSM06.61:"Digitalcellulartelecommunicationssystem(Phase2+);SubstitutionandmutingoflostframeforEnhancedFullRate(EFR)speechtrafficchannels".[5]GSM06.81:"Digitalcellulartelecommunicationssystem(Phase2+);Discontinuoustransmission(DTX)forEnhancedFullRate(EFR)speechtrafficchannels".3Definitions,symbolsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:frame:Timeintervalof20mscorrespondingtothetimesegmentationoftheEnhancedFullRatespeechtranscoder,alsousedasashorttermtrafficframe.SIDframe:FramecharacterizedbytheSID(SIlenceDescriptor)codeword.Itconveysinformationontheacousticbackgroundnoise.SIST EN 300 728 V7.0.1:2003



ETSIETSIEN300728V7.0.1(2000-01)6(GSM06.62version7.0.1Release1998)SIDcodeword:FixedbitpatternforlabellingatrafficframeasaSIDframe.SIDfield:ThebitpositionsoftheSIDcodewordwithinaSIDframe.speechframe:TrafficframethatcannotbeclassifiedasaSIDframe.VADflag:VoiceActivityDetectionflag.SPflag:SPeechflag.OtherdefinitionsoftermsusedinthepresentdocumentcanbefoundinGSM06.60[3]andGSM06.81[5].TheoveralloperationofDTXisdescribedinGSM06.81[5].3.2SymbolsForthepurposesofthepresentdocument,thefollowingsymbolsapply.Boldfacesymbolsareusedforvectorvariables.[]fTfff=1210.UnquantizedLSFvector[].fTfff=1210QuantizedLSFvectorf()mmthunquantizedLSFvectoroftheframef()mmthquantizedLSFvectoroftheframefrefReferenceLSFparametervectorfmeanAveragedLSFparametervectorgcUnquantizedfixedcodebookgaingcQuantizedfixedcodebookgaingcrefReferencefixedcodebookgaingcmeanAveragedfixedcodebookgaineLPLinearpredictionresidualsignaleComputedLSFparameterpredictionresidualeQuantizedLSFparameterpredictionresidualγComputedfixedcodebookgaincorrectionfactorγQuantizedfixedcodebookgaincorrectionfactorxnnab()=()()()()=++++−+xaxaxbxb11SIST EN 300 728 V7.0.1:2003



ETSIETSIEN300728V7.0.1(2000-01)7(GSM06.62version7.0.1Release1998)3.3AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:BSSBaseStationSubsystemDTXDiscontinuousTransmissionMSMobileStationSIDSIlenceDescriptorLPLinearPredictionLSPLineSpectralPairLSFLineSpectralFrequencyRXReceiveTXTransmitVADVoiceActivityDetectorForabbreviationsnotgiveninthissubclause,seeGSM01.04[1].4GeneralAbasicproblemwhenusingDTXisthatthebackgroundacousticnoise,whichistransmittedtogetherwiththespeech,woulddisappearwhentheradiotransmissioniscut,resultingindiscontinuitiesofthebackgroundnoise.SincetheDTXswitchingcantakeplacerapidly,ithasbeenfoundthatthiseffectcanbeveryannoyingforthelistener-especiallyinacarenvironmentwithhighbackgroundnoiselevels.Inbadcases,thespeechmaybehardlyintelligible.Thepresentdocumentspecifiesthewaytoovercomethisproblembygeneratingonthereceive(RX)sidesyntheticnoisesimilartothetransmit(TX)sidebackgroundnoise.ThecomfortnoiseparametersareestimatedontheTXsideandtransmittedtotheRXsidebeforetheradiotransmissionisswitchedoffandataregularlowrateafterwards.ThisallowsthecomfortnoisetoadapttothechangesofthenoiseontheTXside.5Functionsonthetransmit(TX)sideThecomfortnoiseevaluationalgorithmusesthefollowingparametersoftheGSMEnhancedFullRatespeechencoder,definedinGSM06.60[3]:-theunquantizedandquantizedLinearPrediction(LP)parameters,usingtheLineSpectralPair(LSP)representation,wheretheunquantizedLineSpectralFrequency(LSF)vectorisgivenby[]fTfff=1210.,thequantizedLSFvectorisgivenby[].fTfff=1210,andthetwosetsofunquantizedandquantizedLSFvectors(oneforeachhalfofaframe)aregivenbyf()1,f()2,f()1andf()2,respectively;-thequantizedfixed-codebookgaingc.Thealgorithmalsocomputesthefollowingparameterstoassistincomfortnoisegeneration:-thereferenceLSFparametervectorfref(averageofthequantizedLSFparametersofthehangoverperiod);-theaveragedLSFparametervectorfmean(averageoftheLSFparametersoftheeightmostrecentframes);-thereferencefixedcodebookgaingcref(averageofthequantizedfixedcodebookgainvaluesofthehangoverperiod);-theaveragedfixedcodebookgaingcmean(averageofthefixedcodebookgainvaluesoftheeightmostrecentframes);-theunquantizedfixedcodebookgaingc.SIST EN 300 728 V7.0.1:2003



ETSIETSIEN300728V7.0.1(2000-01)8(GSM06.62version7.0.1Release1998)Theseparametersgiveinformationonthelevel(gc,gc,gcref,gcmean)andthespectrum(f()1,f()2,f()1,f()2,fref,fmean)ofthebackgroundnoise.Twooftheevaluatedcomfortnoiseparameters(fmeanandgcmean)areencodedintoaspecialframe,calledaSilenceDescriptor(SID)frame,fortransmissiontotheRXside.SincethereferenceLSFparametervectorfrefandthereferencefixedcodebookgaingcrefcanbeevaluatedinthesamewayintheencoderanddecoder,asgiveninsubclause5.1,notransmissionoftheseparametersisnecessary.TheaveragedLSFparameterandfixedcodebookgainvalues,fmeanandgcmean,arecomputedintheencoderusingbothquantizedandunquantizedparametervaluesiftheperiodoftheeightmostrecentframes(theSIDaveragingperiod)isoverlappingwiththehangoverperiod(theparametersfromtheframesoverlappingwiththehangoverperiodhavequantizedvalues,whiletheparametersofthemorerecentframesoftheSIDaveragingperiodhaveunquantizedvalues).Iftheperiodoftheeightmostrecentframesisnon-overlappingwiththehangoverperiod,theaveragedLSFparameterandfixedcodebookgainvaluesarecomputedusingonlyunquantizedparametervalues.TheSIDframealsoservestoinitiatethecomfortnoisegenerationonthereceiveside,asaSIDframeisalwayssentattheendofaspeechburst,i.e.,beforetheradiotransmissionisterminated.TheschedulingofSIDorspeechframesontheradiopathisdescribedinGSM06.81[5].5.1BackgroundacousticnoiseevaluationThecomfortnoiseparameterstobeencodedintoaSIDframearecalculatedoverN=8consecutiveframesmarkedwithVAD=0,asfollows:TheaveragedLSFparametervector()fmeanioftheframeishallbecomputedaccordingtotheequation:()()ffmeanmmniin=−==18121207()(1)where:()f()miisthemth(unquantized)LSFparametervectorofthecurrentframei(n=0);()f()min−isthemth(quantizedorunquantized)LSFparametervectorofoneofthelastframes(n=1,.,7);nistheaveragingperiodindex(n=0,1,.,7);mistheLSFparametervectorindexwithinaframe(1or2);iistheframeindex.NOTE:Whentheaveragingisperformedattheendofthehangoverperiod(firstSIDupdate),alloftheLSFparametervectors()f()min−ofthe7previousframes(thehangoverperiod)havequantizedvalues,whiletheLSFparameterve
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