SIST EN 300 724 V8.0.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec (GSM 06.53 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 300 724 V8.0.1:2003 is the Slovenian adoption of ETSI EN 300 724 Version 8.0.1. It provides the bit-exact ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec, so implementers can build compatible GSM speech transcoding, Voice Activity Detection (VAD), comfort noise, Discontinuous Transmission (DTX), and lost-frame handling functions.
What does SIST EN 300 724 V8.0.1:2003 specify?
SIST EN 300 724 V8.0.1:2003 specifies an electronic copy of the ANSI-C code for the GSM EFR codec and explains how that code is structured and used. The document is organized into scope, references, definitions and abbreviations, code structure, and an informative change history annex.
| Annex | What it covers |
|---|---|
| Annex A | Change Request History |
Clause 1 defines the scope as the ANSI-C code needed for a bit-exact implementation of the GSM EFR speech transcoder and related functions. Clause 2 lists the companion GSM documents used by reference, and Clauses 3 and 4 explain terminology, file organization, execution, and verification.
What are the key requirements of SIST EN 300 724 V8.0.1:2003?
SIST EN 300 724 V8.0.1:2003 is mainly a software definition and packaging standard. Its practical value is that it tells implementers which code, files, and test artifacts belong to the GSM EFR implementation and how they fit together.
Bit-exact GSM EFR software
Clause 1 states that the ANSI-C code is necessary for a bit-exact implementation of the GSM EFR speech transcoder, VAD, comfort noise, DTX, and examples for substituting and muting lost frames. In practice, this means the code is intended to reproduce the same speech-processing behavior across implementations.
Companion functions covered by the code
The foreword and scope tie the code to the GSM speech transcoder and the related VAD, comfort noise, DTX, and lost-frame handling parts. For a developer, this means the codec is not just the core encoder and decoder - it also supports the surrounding speech channel behavior used in real GSM systems.
File structure and portability
Clause 4.1 describes the C source code disk: source files use the suffix c, headers use h, and ROM data is mostly stored in tab files. The code was verified on Sun Microsystems workstations, IBM PC/AT compatible computers, and Hewlett-Packard workstations, which matters if you need to port or rebuild the implementation.
Separate program roles
Clause 4.2 says the codec is implemented as three separate programs: coder, ed_iface, and decoder. coder converts binary speech input to encoded parameters, decoder converts binary parameters to synthesized speech output, and ed_iface translates the encoder output format into the decoder input format.
Verification and test use
Clause 4.1 states that installation verification uses spch_dos.inp, spch_dos.cod, spch_dos.dec, and spch_dos.out, with corresponding UNIX-form files and batch scripts for DOS and UNIX platforms. Final verification is performed with the GSM EFR test sequences in GSM 06.54, so test teams know where to confirm bit-exact behavior.
Function hierarchy and processing path
Clause 4.3 provides call graphs for encoding, VAD, decoding, and post-filter processing. These graphs help engineers trace how frames move through preprocessing, prediction, excitation, synthesis, and post-processing when debugging or reviewing the codec.
What terms does SIST EN 300 724 V8.0.1:2003 define?
- Enhanced Full Rate (EFR) - The GSM speech codec mode covered by this standard.
- Voice Activity Detection (VAD) - The function that detects when speech is present.
- Discontinuous Transmission (DTX) - The method used to stop continuous transmission during non-speech periods.
- Input/Output (I/O) - The file handling term used for codec data flow.
- Read Only Memory (ROM) - Data stored in the code base as mostly
tabfiles. - ANSI - American National Standards Institute, the C language basis used for the implementation.
- GSM - Global System for Mobile communications, the target mobile telecommunication system.
Who uses SIST EN 300 724 V8.0.1:2003?
SIST EN 300 724 V8.0.1:2003 is used by GSM speech codec developers, telecom software engineers, and test engineers working on Phase 2+ GSM systems. It is also relevant to QA teams that need to verify bit-exact encoder and decoder behavior, and to integrators who need the file layout and execution model of the reference implementation.
What changed in SIST EN 300 724 V8.0.1:2003 from the previous edition?
The foreword says the content was updated through SMG-approved change handling, and the document identifies Version 8.0.1 as the publication release. Annex A records the change-request history leading to the Release 1999 Version 8.0.1 update.
Which standards are used with SIST EN 300 724 V8.0.1:2003?
SIST EN 300 724 V8.0.1:2003 references these companion GSM documents:
- GSM 01.04 - abbreviations and acronyms used across GSM documents.
- GSM 06.54 - test sequences for the GSM EFR codec.
- GSM 06.60 - enhanced full rate speech transcoding.
- GSM 06.61 - substitution and muting of lost frames for EFR speech traffic channels.
- GSM 06.62 - comfort noise aspects for EFR speech traffic channels.
- GSM 06.81 - DTX for EFR speech traffic channels.
- GSM 06.82 - VAD for EFR speech traffic channels.
What does the SIST EN 300 724 V8.0.1:2003 document contain?
The document contains the scope, reference list, definitions and abbreviations, and a code-structure clause with guidance on source files, headers, ROM tables, and platform verification. It also includes installation and final verification artifacts, such as platform-specific batch files and reference input/output files.
Figures 1 to 5 are call graphs that show the codec’s processing flow for encoding, subframe processing, VAD, decoding, and post-filtering. Annex A provides the informative change request history, which is useful when tracing how the Release 1999 version evolved.
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Frequently Asked Questions
SIST EN 300 724 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); ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec (GSM 06.53 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 300 724 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 300 724 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 300 724 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); ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec (GSM 06.53 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 300 724 Version 8.0.1SIST EN 300 724 V8.0.1:2003en01-december-2003SIST EN 300 724 V8.0.1:2003SLOVENSKI
STANDARD
ETSIEN300724V8.0.1(2000-11)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);ANSI-CcodefortheGSMEnhancedFullRate(EFR)speechcodec(GSM06.53version8.0.1Release1999)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 724 V8.0.1:2003
ETSIETSIEN300724V8.0.1(2000-11)2(GSM06.53version8.0.1Release1999)ReferenceREN/SMG-110653Q8KeywordsDigitalcellulartelecommunicationssystem,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 300 724 V8.0.1:2003
ETSIETSIEN300724V8.0.1(2000-11)3(GSM06.53version8.0.1Release1999)ContentsIntellectualPropertyRights.4Foreword.41Scope.52References.53Definitionsandabbreviations.53.1Definitions.53.2Abbreviations.64Ccodestructure.64.1ContentsoftheCsourcecodedisk.64.2Programexecution.74.3Codehierarchy.7AnnexA(informative):ChangeRequestHistory.13History.14SIST EN 300 724 V8.0.1:2003
ETSIETSIEN300724V8.0.1(2000-11)4(GSM06.53version8.0.1Release1999)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).ThepresentdocumentprovidesthebitexactdefinitionoftheEnhancedFullRate(EFR)speechtrafficcodecforthedigitalcellulartelecommunicationssystem.Anelectronicattachmentaccompaniesthepresentdocument,containingclause5,thebit-exactANSI-CcodefortheEnhancedFullRatespeechtranscoder.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 300 724 V8.0.1:2003
ETSIETSIEN300724V8.0.1(2000-11)5(GSM06.53version8.0.1Release1999)1ScopeThepresentdocumentcontainsanelectroniccopyoftheANSI-CcodefortheGSMEnhancedFullRatecodec.TheANSI-CcodeisnecessaryforabitexactimplementationoftheEnhancedFullRatespeechtranscoder(GSM06.60[3]),VoiceActivityDetection(GSM06.82[7]),comfortnoise(GSM06.62[5]),DiscontinuousTransmission(GSM06.81[6])andexamplesolutionsforsubstitutingandmutingoflostframes(GSM06.61[4]).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:"Digitalcellulartelecommunicationssystem(Phase2+);Abbreviationsandacronyms".[2]GSM06.54:"Digitalcellulartelecommunicationssystem(Phase2+);TestsequencesfortheGSMEnhancedFullRate(EFR)speechcodec".[3]GSM06.60:"Digitalcellulartelecommunicationssystem(Phase2+);EnhancedFullRate(EFR)speechtranscoding".[4]GSM06.61:"Digitalcellulartelecommunicationssystem(Phase2+);SubstitutionandmutingoflostframeforEnhancedFullRate(EFR)speechtrafficchannels".[5]GSM06.62:"Digitalcellulartelecommunicationssystem(Phase2+);Comfortnoise
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