SIST EN 300 966 V8.0.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Half rate speech processing functions (GSM 06.02 version 8.0.1 Release 1999)
- Abstract
Updated to Version 8.0.0 CRs from SMG#31
- 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
SIST EN 300 966 V8.0.1:2003 is the SIST adoption of ETSI EN 300 966 Version 8.0.1 for Digital cellular telecommunications system (Phase 2+) (GSM) half-rate speech processing functions. It gives a general overview of the half-rate speech traffic-channel functions and points to the detailed ETSI technical specifications for transcoding, discontinuous transmission, voice activity detection, comfort noise, lost-frame handling and codec homing. Engineers, quality managers and buyers use it to understand which GSM half-rate speech functions belong together and which companion documents specify each one.
What does SIST EN 300 966 V8.0.1:2003 specify?
SIST EN 300 966 V8.0.1:2003 specifies the overall speech-processing structure for the half-rate channel in GSM Phase 2+ and serves as an introduction to the detailed technical specifications. It explains how the functions fit together, what each function does, and where to find the detailed requirements.
The document is organized into:
- Clause 1 - Scope
- Clause 2 - References
- Clause 3 - Definitions and abbreviations
- Clause 4 - General
- Clauses 5 to 10 - the individual half-rate speech functions
- Annex A - informative change request history
Annex A is informative and records the change request history for the document.
What are the key requirements of SIST EN 300 966 V8.0.1:2003?
SIST EN 300 966 V8.0.1:2003 does not duplicate the detailed algorithms of the GSM half-rate speech functions. Instead, it defines how the functions are grouped and how they interact, so the reader can use the companion technical specifications correctly.
Speech transcoding
Clause 5 describes half-rate speech transcoding and points to GSM 06.20. The speech encoder accepts 13-bit uniform PCM input, or 8-bit A-law or µ-law via conversion from the PSTN side, and the encoded speech is passed to channel coding in GSM 05.03. In practice, this tells implementers which interface formats the transcoder works with and where the detailed codec behavior is specified.
Discontinuous transmission
Clause 6 describes Discontinuous Transmission (DTX). DTX switches transmission on only for frames with useful information, which helps prolong mobile station battery life and reduce radio interference. The clause shows that DTX depends on a transmit-side Voice Activity Detector (VAD), background-noise evaluation, comfort-noise generation at the receiver, and SIlence Descriptor (SID) frames that mark speech pauses and update the receiver.
Voice activity detection
Clause 7 describes the VAD function in GSM 06.42. The VAD uses parameters from the speech encoder to decide whether each 20 ms speech-coder frame contains speech. In practice, the VAD flag feeds the TX DTX handler, so it supports DTX control rather than directly keying the transmitter.
Comfort noise
Clause 8 describes comfort-noise insertion in GSM 06.22. When transmission stops during DTX, the receiver generates artificial background noise to avoid a sudden drop in noise level. This matters because it reduces the audible “noise contrast effect” and keeps pauses sounding more natural.
Lost-frame handling
Clause 9 describes substitution and muting for lost speech frames and lost SID frames. An isolated lost speech frame is replaced by a predicted frame derived from previous frames, and longer loss bursts use muting. The clause also states that silence-frame insertion is not allowed, which is important for receiver behavior during errors or frame stealing.
Codec homing
Clause 10 describes codec homing for the speech transcoder, VAD, DTX system and comfort-noise parts. These functions are defined in bit-exact arithmetic and must produce the same output for a given input sequence when the internal state is the same. Special encoder-homing and decoder-homing frames support type approval and remote testing, and they are used to force modules into known home states.
What terms does SIST EN 300 966 V8.0.1:2003 define?
- Discontinuous Transmission (DTX) - A mode where transmission is active only for useful speech-related frames.
- Voice Activity Detector (VAD) - The function that decides whether a frame contains speech.
- SIlence Descriptor (SID) - A frame that carries background-noise information for comfort-noise generation.
- Speech flag (SP) - A flag that indicates whether transmitted information bits are speech or SID information.
- Bad Frame Indication (BFI) - A receiver-side flag used when a frame is bad.
- Unreliable Frame Indication (UFI) - A flag used to mark received information as unreliable.
- Time Alignment Flag (TAF) - A flag that marks the position of a SID frame within the SACCH multiframe.
- Vector Sum Excited Linear Predictor (VSELP) - The coding scheme used for the half-rate speech codec.
Who uses SIST EN 300 966 V8.0.1:2003?
SIST EN 300 966 V8.0.1:2003 is used by GSM equipment designers, speech-codec developers, and system integrators working on half-rate speech traffic channels. It is also relevant for type approval of mobile terminal equipment and infrastructure equipment, and for remote control and testing in operation and maintenance. Quality and test teams use it as the overview document that ties together the speech codec, DTX, VAD, comfort-noise and frame-handling specifications.
What changed in SIST EN 300 966 V8.0.1:2003 from the previous edition?
SIST EN 300 966 V8.0.1:2003 was updated to Version 8.0.0 CRs from SMG#31. Annex A records the change request history, including the move to Version 8.0.1 for publication.
Which standards are used with SIST EN 300 966 V8.0.1:2003?
SIST EN 300 966 V8.0.1:2003 relies on these named references and companion parts:
- GSM 01.04 - abbreviations and acronyms used when a term is not defined in this clause.
- GSM 03.50 - transmission planning aspects of speech services in the GSM PLMN system.
- GSM 05.03 - channel coding used after speech encoding.
- GSM 06.20 - half-rate speech transcoding.
- GSM 06.21 - substitution and muting of lost frames.
- GSM 06.22 - comfort-noise aspects.
- GSM 06.41 - DTX for half-rate speech traffic channels.
- GSM 06.42 - VAD for half-rate speech traffic channels.
- ITU-T Recommendation G.711 - PCM of voice frequencies.
- GSM 06.07 - test sequences for the GSM half-rate speech codec.
- GSM 06.06 - ANSI-C code for the GSM half-rate speech codec.
What does the SIST EN 300 966 V8.0.1:2003 document contain?
The document contains a figure that maps the complete audio-processing path between the Mobile Station (MS) and the Public Switched Telephone Network (PSTN), including the BSS side, the RSS, encoder and decoder paths, DTX handlers, VAD, comfort-noise functions, and the flags that move between them. It also contains clause-by-clause explanations of how each half-rate speech function is related to its detailed specification in the GSM series.
Annex A provides a change request history table. The foreword also lists the companion GSM documents that make up the half-rate speech family, which helps readers navigate the full specification set.
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Frequently Asked Questions
SIST EN 300 966 V8.0.1:2003 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; Half rate speech processing functions (GSM 06.02 version 8.0.1 Release 1999)". This standard covers: Updated to Version 8.0.0 CRs from SMG#31
Updated to Version 8.0.0 CRs from SMG#31
SIST EN 300 966 V8.0.1:2003 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 300 966 V8.0.1:2003 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 300 966 V8.0.1:2003 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; Half rate speech processing functions (GSM 06.02 version 8.0.1 Release 1999)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 966 Version 8.0.1SIST EN 300 966 V8.0.1:2003en01-december-2003SIST EN 300 966 V8.0.1:2003SLOVENSKI
STANDARD
ETSIEN300966V8.0.1(2000-11)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Halfratespeechprocessingfunctions(GSM06.02version8.0.1Release1999)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 966 V8.0.1:2003
ETSIETSIEN300966V8.0.1(2000-11)2(GSM06.02version8.0.1Release1999)ReferenceREN/SMG-110602Q8KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 966 V8.0.1:2003
ETSIETSIEN300966V8.0.1(2000-11)3(GSM06.02version8.0.1Release1999)ContentsIntellectualPropertyRights.4Foreword.41Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.2Abbreviations.74General.75Halfratespeechtranscoding.96HalfrateDiscontinuousTransmission(DTX).97HalfrateVoiceActivityDetection(VAD).108Halfratecomfortnoiseinsertion.109Halfratelostspeechframesubstitutionandmuting.1010Halfratecodechoming.11AnnexA(informative):ChangeRequestHistory.12History.13SIST EN 300 966 V8.0.1:2003
ETSIETSIEN300966V8.0.1(2000-11)4(GSM06.02version8.0.1Release1999)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeSpecialMobileGroup(SMG).Thepresentdocumentgivesageneraloverviewofthehalfratespeechtrafficchannelsspeechprocessingfunctionsforthedigitalcellulartelecommunicationssystem.ThepresentdocumentispartofENs'seriescoveringthehalfratespeechtrafficchannelsasdescribedbelow:GSM06.02"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Halfratespeechprocessingfunctions".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".GSM06.06"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;ANSI-CcodefortheGSMhalfratespeechcodec".GSM06.07"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;TestsequencesfortheGSMhalfratespeechcodec".SIST EN 300 966 V8.0.1:2003
ETSIETSIEN300966V8.0.1(2000-11)5(GSM06.02version8.0.1Release1999)ThecontentsofthepresentdocumentissubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillbere-releasedwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version8.x.ywhere:8indicatesRelease1999ofGSMPhase2+xtheseconddigitisincrementedforallchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:3November2000DateoflatestannouncementofthisEN(doa):28February2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31August2001DateofwithdrawalofanyconflictingNationalStandard(dow):31August2001SIST EN 300 966 V8.0.1:2003
ETSIETSIEN300966V8.0.1(2000-11)6(GSM06.02version8.0.1Release1999)1ScopeThepresentdocumentisanintroductiontoGSM06.20[4],GSM06.21[5],GSM06.22[6],GSM06.41[7]andGSM06.42[8]TSsdealingwiththespeechprocessingfunctionsinthehalf-ratechanneloftheGSMsystem.Ageneraloverviewofthespeechprocessingfunctionsisgiven,withreferencetotheTSswhereeachfunctionisspecifiedindetail.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1999document,referencestoGSMdocumentsareforRelease1999versions(version8.x.y).[1]GSM01.04:"Digitalcellulartelecommunicationsystem(Phase2+);Abbreviationsandacronyms".[2]GSM03.50:"Digitalcellulartelecommunicationsystem(Phase2+);TransmissionplanningaspectsofthespeechservicesintheGSMPublicLandMobileNetwork(PLMN)system".[3]GSM05.03:"Digitalcellulartelecommunicationssystem(Phase2+);Channelcoding".[4]GSM06.20:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech:Halfratespeechtranscoding".[5]GSM06.21:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Substitutionandmutingoflostframeforhalfratespeechtrafficchannels".[6]GSM06.22:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Comfortnoiseaspectsforhalfratespeechtrafficchannels".[7]GSM06.41:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;Discontinuoustransmission(DTX)forhalfratespeechtrafficchannels".[8]GSM06.42:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;VoiceActivityDetector(VAD)forhalfratespeechtrafficchannels".[9]ITU-TRecommendationG.711:"PulseCodeModulation(PCM)ofvoicefrequencies".[10]GSM06.07:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;TestsequencesfortheGSMhalfratespeechcodec".[11]GSM06.06:"Digitalcellulartelecommunicationssystem(Phase2+);Halfratespeech;ANSI-CcodefortheGSMhalfratespeechcodec".SIST EN 300 966 V8.0.1:2003
ETSIETSIEN300966V8.0.1(2000-11)7(GSM06.02version8.0.1Release1999)3Definitionsandabbreviations3.1DefinitionsDefinitionoftermsusedinth
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