ETSI EN 300 971 V7.0.1 (2000-01)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Comfort noise aspects for the half rate speech traffic channels (GSM 06.22 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 300 971 Version 7.0.1SIST EN 300 971 V7.0.1:2003en01-december-2003SIST EN 300 971 V7.0.1:2003SLOVENSKI
STANDARD



SIST EN 300 971 V7.0.1:2003



ETSIEN300971V7.0.1(2000-01)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Comfortnoiseaspectsforthehalfratespeechtrafficchannels(GSM06.22version7.0.1Release1998)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 971 V7.0.1:2003



ETSIETSIEN300971V7.0.1(2000-01)2(GSM06.22version7.0.1Release1998)ReferenceREN/SMG-110622Q7KeywordsDigitalcellulartelecommunicationssystem,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 300 971 V7.0.1:2003



ETSIETSIEN300971V7.0.1(2000-01)3(GSM06.22version7.0.1Release1998)ContentsIntellectualPropertyRights.4Foreword.41Scope.62References.63Definitions,symbolsandabbreviations.63.1Definitions.63.2Symbols.73.3Abbreviations.74General.75Functionsonthetransmit(TX)side.85.1Backgroundacousticnoiseevaluation.85.2ModificationofthespeechencodingalgorithmduringSIDframegeneration.95.3SID-frameencoding.106Functionsonthereceive(RX)side.116.1AveragingoftheGSparameters.116.2Comfortnoisegenerationandupdating.127Computationaldetails.12AnnexA(informative):ChangeRequestHistory.13History.14SIST EN 300 971 V7.0.1:2003



ETSIETSIEN300971V7.0.1(2000-01)4(GSM06.22version7.0.1Release1998)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).Thepresentdocumentgivesthedetailedrequirementsforthecorrectoperationofthebackgroundacousticnoiseevaluation,noiseparameterencoding/decodingandcomfortnoisegenerationwithinthedigitalcellulartelecommunicationssystem.Thepresentdocumentispartofaseriescoveringthehalfratespeechtrafficchannelsasdescribedbelow:GSM06.02"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Halfratespeechprocessingfunctions".GSM06.06"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;ANSI-CcodefortheGSMhalfratespeechcodec".GSM06.07"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;TestsequencesfortheGSMhalfratespeechcodec".GSM06.20"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Halfratespeechtranscoding".GSM06.21"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Substitutionandmutingoflostframesforhalfratespeechtrafficchannels".GSM06.22"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Comfortnoiseaspectsforhalfratespeechtrafficchannels".GSM06.41"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;DiscontinuousTransmission(DTX)forhalfratespeechtrafficchannels".GSM06.42"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;VoiceActivityDetector(VAD)forhalfratespeechtrafficchannels".ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version7.x.ywhere:7indicatesRelease1998ofGSMPhase2+.xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.SIST EN 300 971 V7.0.1:2003



ETSIETSIEN300971V7.0.1(2000-01)5(GSM06.22version7.0.1Release1998)NationaltranspositiondatesDateofadoptionofthisEN:31December1999DateoflatestannouncementofthisEN(doa):31March2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30September2000DateofwithdrawalofanyconflictingNationalStandard(dow):30September2000SIST EN 300 971 V7.0.1:2003



ETSIETSIEN300971V7.0.1(2000-01)6(GSM06.22version7.0.1Release1998)1ScopeThepresentdocumentgivesthedetailedrequirementsforthecorrectoperationofthebackgroundacousticnoiseevaluation,noiseparameterencoding/decodingandcomfortnoisegenerationinGSMMobileStations(MS)sandBaseStationSystems(BSS)sduringDiscontinuousTransmission(DTX)onhalfratespeechtrafficchannels.TherequirementsdescribedinthepresentdocumentaremandatoryforimplementationinallGSMMSscapableofsupportingthehalfratespeechtrafficchannel.ThereceiverrequirementsaremandatoryforimplementationinallGSMBSSscapableofsupportingthehalfratespeechtrafficchannel,thetransmitterrequirementsareonlyforthosewheredownlinkDTXwillbeused.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:"Digitalcellulartelecommunicationsystem(Phase2+);Abbreviationsandacronyms".[2]GSM06.20:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeechtranscoding".[3]GSM06.41:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;DiscontinuousTransmission(DTX)forhalfratespeechtrafficchannels".[4]GSM06.42:"Digitalcellulartelecommunicationssystem(Phase2+);"Halfratespeech;VoiceActivityDetector(VAD)forhalfratespeechtrafficchannels".[5]GSM06.06:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;ANSI-CcodefortheGSMhalfratespeechcodec".3Definitions,symbolsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply.frame:Timeintervalof20mscorrespondingtothetimesegmentationofthehalfratespeechtranscoder,alsousedasashorttermforatrafficframe.H(Z):Combinationoftheshortterm(spectral)filterA(z)andthespectralweightingfilterW(z).SIDcodeword:FixedbitpatternforlabellingatrafficframeasaSIDframe.SIDfield:ThebitpositionsoftheSIDcodewordwithinaSIDframe.SIST EN 300 971 V7.0.1:2003



ETSIETSIEN300971V7.0.1(2000-01)7(GSM06.22version7.0.1Release1998)SIDframe:FramecharacterizedbytheSID(SilenceDescriptor)codeword.Itconveysinformationontheacousticbackgroundnoise.SPflag:SPeechflag.speechframe:TrafficframethatcannotbeclassifiedasaSIDframe.VADflag:VoiceActivityDetectorflag.W(Z):SpectralweightingfilteroftheGSMhalfratespeechcodec.OtherdefinitionsoftermsusedinthepresentdocumentcanbefoundinGSM06.20[2]andGSM06.41[3].TheoveralloperationofDTXisdescribedinGSM06.41[3].3.2SymbolsForthepurposesofthepresentdocument,thefollowingsymbolsapply:GSEnergytweakparameter.R0Frameenergyvalue.R(i)Unquantised(normalized)autocorrelationsequence.rjOptimalreflectioncoefficient.bSUM(x(n))=x(a)+x(a+1)+.+x(b-1)+x(b);(Accumulation).n=aGSP0codewordVectorquantizationindex,jointvectorquantizationoftheparametersGSandP0.P0Powercontributionofthefirstexcitationvectorasafractionofthetotalexcitationpoweratasubframe.3.3AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:AFLATAutocorrelationFixedPointLAtticeTechnique(usedintheGSMhalfratespeechcodecforthevectorquantizationofthe
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