SIST EN 300 971 V7.0.1:2003
(Main)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)
General Information
- Abstract
Upgrade from Phase 2+ to Release 1998
- Status
- Published
- Publication Date
- 30-Nov-2003
- 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
Overview
SIST EN 300 971 V7.0.1:2003 defines the requirements for handling comfort noise in half rate speech traffic channels within the digital cellular telecommunications system (GSM), specifically for Phase 2+ (Release 1998). Developed by the Slovenski inštitut za standardizacijo (SIST) and aligned with EN 300 971, this standard is essential for maintaining voice quality and user experience during periods of silence, known as Discontinuous Transmission (DTX), when using GSM half-rate codecs. The document specifies how to evaluate, encode, and generate comfort noise, preventing abrupt transitions from speech to silence and ensuring natural background noise in GSM networks.
Key Topics
Comfort Noise Generation: The standard describes the methods for generating synthetic background noise on the receiver (RX) side, closely resembling the acoustic environment on the transmitter (TX) side. This process uses parameters estimated and transmitted by the mobile station (MS) before switching off the radio transmission, keeping the perceived noise consistent for the user.
Silence Descriptor (SID) Frames: Critical information related to comfort noise is encoded into specific traffic frames called SID frames. These frames contain background noise parameters and are transmitted during periods when no active speech is detected.
Parameter Averaging: The document details how frame energy and spectral features are averaged over several frames to produce smooth, realistic comfort noise. This ensures seamless transitions during DTX and avoids distracting changes for the listener.
Mandatory Implementation: The requirements outlined are mandatory for all GSM mobile stations and base station systems supporting half-rate speech traffic channels, ensuring consistent network-wide performance.
Applications
The practical applications of SIST EN 300 971 V7.0.1:2003 are crucial for optimizing GSM network performance and user satisfaction:
Voice Quality Maintenance: By ensuring consistent comfort noise during silent periods in calls, mobile operators can prevent sudden drops to complete silence, which can be perceived as call issues or technical failures by users.
Network Efficiency: Utilizing half rate speech codecs doubles the capacity of GSM networks by allowing more simultaneous calls. Proper implementation of comfort noise features ensures that this efficiency does not compromise call quality.
Device Compatibility: All compliant GSM mobile phones and infrastructure elements, such as base station systems, must implement these comfort noise aspects, guaranteeing interoperability and standardized behavior across networks.
Regulatory Compliance: Adoption of this standard helps operators and manufacturers meet European and international requirements for digital cellular telecommunications systems.
Related Standards
For a comprehensive implementation and understanding of half rate speech and comfort noise in GSM systems, the following related standards are relevant:
- GSM 06.20: Half rate speech transcoding specifications.
- GSM 06.06: Source code for the half rate speech codec.
- GSM 06.07: Test sequences for the half rate speech codec.
- GSM 06.41: Discontinuous Transmission (DTX) procedures for half rate channels.
- GSM 06.42: Voice Activity Detector (VAD) details for half rate speech.
These standards collectively ensure robust and efficient handling of speech and silence in GSM networks, supporting superior voice communication and network resource management.
Keywords: GSM standard, comfort noise, half rate speech, Discontinuous Transmission, SID frame, digital cellular telecommunications, mobile network quality, SIST EN 300 971, Release 1998, voice quality, GSM Phase 2+
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Frequently Asked Questions
SIST EN 300 971 V7.0.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "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)". This standard covers: Upgrade from Phase 2+ to Release 1998
Upgrade from Phase 2+ to Release 1998
SIST EN 300 971 V7.0.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.070.50 - Global System for Mobile Communication (GSM). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 971 V7.0.1:2003 is associated with the following European legislation: Standardization Mandates: T-172. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 300 971 V7.0.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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
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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