SIST EN 300 724 V6.0.1:2003

• Abstract:

  Upgrade from Phase 2+ to Release 1997

• 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 300 724 V6.0.1 (1999-06) - Digital cellular telecommunications system (Phase 2+) (GSM); ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec (GSM 06.53 version 6.0.1 Release 1997)

Overview

SIST EN 300 724 V6.0.1:2003 standard, developed by the Slovenski inštitut za standardizacijo (SIST) and harmonized with EN 300 724, specifies the ANSI-C source code for the GSM Enhanced Full Rate (EFR) speech codec. This standard supports the evolution of the Global System for Mobile Communications (GSM) from Phase 2+ to Release 1997, ensuring a bit-exact implementation of the EFR speech transcoder. The standard is crucial for manufacturers, software developers, and network operators aiming to implement high-quality voice services within 2G GSM networks.

Key Topics

• Enhanced Full Rate (EFR) Speech Codec: Defines the bit-exact ANSI-C implementation of the EFR codec, supporting clear voice transmission and robust performance, even in challenging radio environments.
• Reference Implementation: Provides an electronic attachment comprising the reference ANSI-C code for direct deployment or verification purposes.
• Cross-Platform Compatibility: ANSI-C code has been tested on multiple platforms, including Sun Microsystems, IBM PC/AT, and Hewlett Packard workstations, aligning with the goal of broad interoperability.
• Program Structure:
  • Coder: Converts input speech into encoded parameters.
  • Decoder: Reconstructs speech from encoded parameters.
  • Interface Program: Manages file format conversion between encoding and decoding processes.
• Verification Tools: Includes batch files and reference input/output datasets for installation verification on DOS and UNIX-like systems.

Applications

The practical value of SIST EN 300 724 V6.0.1 lies in its direct application to mobile telecommunication systems and associated development environments:

• GSM Infrastructure Development: Ensures that network elements-such as base stations and mobile devices-deploy a consistent, standards-compliant speech codec for Enhanced Full Rate voice services.
• Equipment Certification and Testing: Manufacturers use the provided ANSI-C code for reference and interoperability testing, confirming implementation against the accepted industry benchmark.
• Software Porting and Integration: Facilitates integration of the GSM EFR codec into embedded systems, custom hardware, simulators, or testing tools thanks to platform-neutral ANSI-C.
• Research and Development: Used by academic and industrial research teams working on speech processing, compression algorithms, and digital signal processing for mobile communications.
• Voice Quality Improvement: Supports solutions enhancing perceived speech quality in GSM networks, particularly in scenarios involving voice activity detection (VAD), comfort noise generation, and discontinuous transmission (DTX).

Related Standards

• GSM 06.53: Detailed specification for the Enhanced Full Rate (EFR) speech codec.
• GSM 06.54: Test sequences for validating EFR codec performance.
• GSM 06.60: Speech transcoding procedures for EFR implementation.
• GSM 06.61: Handling substitution and muting of lost speech frames.
• GSM 06.62: Comfort noise generation in EFR traffic channels.
• GSM 06.81: Discontinuous transmission (DTX) operations for EFR.
• GSM 06.82: Voice Activity Detector (VAD) algorithms for EFR channels.
• GSM 01.04: Abbreviations and acronyms for GSM technical documentation.

Summary

SIST EN 300 724 V6.0.1:2003 delivers a reference framework and code for implementing the GSM Enhanced Full Rate speech codec in mobile telecommunications. By adhering to this standard, vendors and operators achieve improved voice quality, interoperability, and reliability in GSM networks, supporting continued evolution towards robust and scalable mobile voice services. This document is essential for anyone integrating or testing the GSM EFR codec in new or legacy 2G environments.

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 6.0.1 Release 1997)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 6.0.1SIST EN 300 724 V6.0.1:2003en01-december-2003SIST EN 300 724 V6.0.1:2003SLOVENSKI
STANDARD
EN 300 724 V6.0.1 (1999-06)European Standard (Telecommunications series)Digital cellular telecommunications system (Phase 2+);ANSI-C code for the GSM Enhanced Full Rate (EFR)speech codec(GSM 06.53 version 6.0.1 Release 1997)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRSIST EN 300 724 V6.0.1:2003

ETSIEN 300 724 V6.0.1 (1999-06)2GSM 06.53 version 6.0.1 Release 1997ReferenceDEN/SMG-020653Q6 (6pc0300o.PDF)KeywordsDigital cellular telecommunications system,Global System for Mobile communications (GSM)ETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/[e-mail] copies of this ETSI deliverablecan be downloaded fromhttp://www.etsi.orgCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1999.All rights reserved.SIST EN 300 724 V6.0.1:2003

ETSIEN 300 724 V6.0.1 (1999-06)3GSM 06.53 version 6.0.1 Release 1997ContentsIntellectual Property Rights.4Foreword.41Scope.52References.53Definitions and abbreviations.53.1Definitions.53.2Abbreviations.54C code structure.64.1Contents of the C source code disk.64.2Program execution.64.3Code hierarchy.7Annex A (informative):Change Request History.13History.14SIST EN 300 724 V6.0.1:2003

ETSIEN 300 724 V6.0.1 (1999-06)4GSM 06.53 version 6.0.1 Release 1997Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI Web server (http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Technical Committee Special MobileGroup (SMG).The present document provides the bit exact definition of the Enhanced Full Rate (EFR) speech traffic codec for thedigital cellular telecommunications system.An electronic attachment accompanies the present document, containing clause 5, the bit-exact ANSI-C code for theEnhanced Full Rate speech transcoder.The contents of the present document is subject to continuing work within SMG and may change following formal SMGapproval. Should SMG modify the contents of the present document it will be re-released with an identifying change ofrelease date and an increase in version number as follows:Version 6.x.ywhere:6indicates Release 1997 of GSM Phase 2+xthe second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates,etc.ythe third digit is incremented when editorial only changes have been incorporated in the specification.Proposed national transposition datesDate of adoption of this EN:05 June 1999Date of latest announcement of this EN (doa):30 September 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 March 2000Date of withdrawal of any conflicting National Standard (dow):31 March 2000SIST EN 300 724 V6.0.1:2003

ETSIEN 300 724 V6.0.1 (1999-06)5GSM 06.53 version 6.0.1 Release 19971ScopeThe present document contains an electronic copy of the ANSI-C code for the GSM Enhanced Full Rate codec. TheANSI-C code is necessary for a bit exact implementation of the Enhanced Full Rate speech transcoder (GSM 06.60 [3]),Voice Activity Detection (GSM 06.82 [7]), comfort noise (GSM 06.62 [5]), Discontinuous Transmission(GSM 06.81 [6]) and example solutions for substituting and muting of lost frames (GSM 06.61 [4]).2ReferencesThe following documents contain provisions which, through reference in this text, constitute provisions of the presentdocument.· References are either specific (identified by date of publication, edition number, version number, etc.) ornon-specific.· For a specific reference, subsequent revisions do not apply.· For a non-specific reference, the latest version applies.· A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations andacronyms".[2]GSM 06.54: "Digital cellular telecommunications system (Phase 2+); Test sequences for the GSMEnhanced Full Rate (EFR) speech codec".[3]GSM 06.60: "Digital cellular telecommunications system (Phase 2+); Enhanced Full Rate (EFR)speech transcoding".[4]GSM 06.61: "Digital cellular telecommunications system (Phase 2+); Substitution and muting oflost frame for Enhanced Full Rate (EFR) speech traffic channels".[5]GSM 06.62: "Digital cellular telecommunications system (Phase 2+); Comfort noise aspects forEnhanced Full Rate (EFR) speech traffic channels".[6]GSM 06.81: "Digital cellular telecommunications system (Phase 2+); Discontinuous transmission(DTX) for Enhanced Full Rate (EFR) speech traffic channels".[7]GSM 06.82: "Digital cellular telecommunications system (Phase 2+); Voice Activity Detector(VAD) for Enhanced Full Rate (EFR) speech traffic channels".3Definitions and abbreviations3.1DefinitionsDefinition of terms
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