SIST ETS 300 724 E1:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system; ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec (GSM 06.53)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:ETS 300 724 Edition 1SIST ETS 300 724 E1:2003en01-december-2003SIST ETS 300 724 E1:2003SLOVENSKI
STANDARD



SIST ETS 300 724 E1:2003



EUROPEANETS 300 724TELECOMMUNICATIONMarch 1997STANDARDSource: ETSI TC-SMGReference: DE/SMG-020653ICS:33.020Key words:EFR, CODEC, digital cellular telecommunications system, Global System for Mobilecommunications (GSM), speech, ANSI-C codeGLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRDigital cellular telecommunications system;ANSI-C code for the GSM Enhanced Full Rate (EFR)speech codec(GSM 06.53)ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.frTel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1997. All rights reserved.SIST ETS 300 724 E1:2003



Page 2ETS 300 724 (GSM 06.53 version 5.1.2): March 1997Whilst every care has been taken in the preparation and publication of this document, errors in content,typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to"ETSI Editing and Committee Support Dept." at the address shown on the title page.SIST ETS 300 724 E1:2003



Page 3ETS 300 724 (GSM 06.53 version 5.1.2): March 1997ContentsForeword.51Scope.72Normative references.73Definitions and abbreviations.73.1Definitions.73.2Abbreviations.74C code structure.84.1Contents of the C source code diskette.84.2Program execution.94.3Code hierarchy.9History.155
ANSI-C source code diskette.Back coverSIST ETS 300 724 E1:2003



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Page 5ETS 300 724 (GSM 06.53 version 5.1.2): March 1997ForewordThis European Telecommunication Standard (ETS) has been produced by the Special Mobile Group(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).This ETS provides the bit exact definition of the Enhanced Full Rate (EFR) speech traffic codec for thedigital cellular telecommunications system.This ETS corresponds to GSM technical specification, GSM 06.53, version 5.1.2.A 3.5 inch diskette is attached to the back cover of this ETS, this diskette contains clause 5, the bit-exactANSI-C code for the Enhanced Full Rate speech transcoder.Transposition datesDate of adoption:28 February 1997Date of latest announcement of this ETS (doa):30 June 1997Date of latest publication of new National Standardor endorsement of this ETS (dop/e):31 December 1997Date of withdrawal of any conflicting National Standard (dow):31 December 1997SIST ETS 300 724 E1:2003



Page 6ETS 300 724 (GSM 06.53 version 5.1.2): March 1997Blank pageSIST ETS 300 724 E1:2003



Page 7ETS 300 724 (GSM 06.53 version 5.1.2): March 19971ScopeThis European Telecommunication Standard (ETS) contains an electronic copy of the ANSI-C code forthe GSM Enhanced Full Rate codec. The ANSI-C code is necessary for a bit exact implementation of theEnhanced Full Rate speech transcoder (GSM 06.60 (ETS 300 726) [3]), Voice Activity Detection(GSM 06.82 (ETS 300 730) [7]), comfort noise (GSM 06.62 (ETS 300 728) [5]), DiscontinuousTransmission (GSM 06.81 (ETS 300 729) [6]) and example solutions for substituting and muting of lostframes (GSM 06.61 (ETS 300 727) [4]).2Normative referencesThis ETS incorporates by dated and undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references, thelatest edition of the publication referred to applies.[1]GSM 01.04 (ETR 350): "Digital cellular telecommunications system (Phase 2+);Abbreviations and acronyms".[2]GSM 06.54 (ETS 300 725): "Digital cellular telecommunications system(Phase 2); Test sequences for the GSM Enhanced Full Rate (EFR) speechcodec".[3]GSM 06.60 (ETS 300 726): "Digital cellular telecommunications system;Enhanced Full Rate (EFR) speech transcoding".[4]GSM 06.61 (ETS 300 727): "Digital cellular telecommunications system;Substitution and muting of lost frame for Enhanced Full Rate (EFR) speechtraffic channels".[5]GSM 06.62 (ETS 300 728): "Digital cellular telecommunications system;Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels".[6]GSM 06.81 (ETS 300 729): "Digital cellular telecommunications system;Discontinuous transmission (DTX) for Enhanced Full Rate (EFR) speech trafficchannels".[7]GSM 06.82 (ETS 300 730): "Digital cellular telecommunications system; VoiceActivity Detector (VAD) for Enhanced Full Rate (EFR) speech traffic channels".3Definitions and abbreviations3.1DefinitionsDefinition of terms used in this ETS can be found in GSM 06.60 (ETS 300 726) [3], GSM 06.61(ETS 300 727) [4], GSM 06.62 (ETS 300 728) [5], GSM 06.81 (ETS 300 729) [6] and GSM 06.82(ETS 300 730) [7].3.2AbbreviationsFor the purposes of this ETS, the following abbreviations apply:ANSIAmerican National Standards InstituteDS-HDDouble Sided High DensityETSEuropean Telecommunication StandardGSMGlobal System for Mobile communicationsI/OInp
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