ETSI EN 301 244 V4.0.1 (1998-01)

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 4.0.1)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 301 244 Version 4.0.1SIST EN 301 244 V4.0.1:2003en01-december-2003SIST EN 301 244 V4.0.1:2003SLOVENSKI
STANDARD
EN 301 244 V4.0.1 (1998-01)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 4.0.1)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRSIST EN 301 244 V4.0.1:2003

EN 301 244 V4.0.1 (1998-01)2GSM 06.53 version 4.0.1ReferenceDEN/SMG-110653P (bio0200o.PDF)KeywordsEFR, CODEC, digital cellular telecommunicationssystem, Global System for Mobilecommunications (GSM), speech, ANSI-C codeETSI SecretariatPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88X.400c= fr; a=atlas; p=etsi; s=secretariatInternetsecretariat@etsi.frhttp://www.etsi.frCopyright 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 1998.All rights reserved.SIST EN 301 244 V4.0.1:2003

EN 301 244 V4.0.1 (1998-01)3GSM 06.53 version 4.0.1ContentsIntellectual Property Rights.4Foreword.41Scope.52Normative references.53Definitions and abbreviations.53.1Definitions.53.2Abbreviations.54C code structure.64.1Contents of the C source code diskette.64.2Program execution.64.3Code hierarchy.7History.135
ANSI-C source code diskette.Back coverSIST EN 301 244 V4.0.1:2003

EN 301 244 V4.0.1 (1998-01)4GSM 06.53 version 4.0.1Intellectual 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 ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSIWeb server (http://www.etsi.fr/ipr).Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. Noguarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates onhttp://www.etsi.fr/ipr) which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by the Special Mobile Group (SMG) of theEuropean Telecommunications Standards Institute (ETSI).This EN provides the bit exact definition of the Enhanced Full Rate (EFR) speech traffic codec for the digital cellulartelecommunications system.A 3.5 inch diskette is attached to the back cover of this EN, this diskette contains clause 5, the bit-exact ANSI-C codefor the Enhanced Full Rate speech transcoder.National transposition datesDate of adoption of this EN:19 December 1997Date of latest announcement of this EN (doa):30 April 1998Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 October 1998Date of withdrawal of any conflicting National Standard (dow):31 October 1998SIST EN 301 244 V4.0.1:2003

EN 301 244 V4.0.1 (1998-01)5GSM 06.53 version 4.0.11ScopeThis EN contains an electronic copy of the ANSI-C code for the GSM Enhanced Full Rate codec. The ANSI-C code isnecessary for a bit exact implementation of the Enhanced Full Rate speech transcoder (GSM 06.60 (EN 301 245) [3]),Voice Activity Detection (GSM 06.82 (EN 301 249) [7]), comfort noise (GSM 06.62 (EN 301 247) [5]), DiscontinuousTransmission (GSM 06.81 (EN 301 248) [6]) and example solutions for substituting and muting of lost frames(GSM 06.61 (EN 301 246) [4]).2Normative referencesThis EN incorporates by dated and undated reference, provisions from other publications. These normative referencesare cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequentamendments to or revisions of any of these publications apply to this EN only when incorporated in it by amendment orrevision. For undated references, the latest edition of the publication referred to applies.[1]GSM 01.04 (ETR 350): "Digital cellular telecommunications system (Phase 2+); Abbreviationsand acronyms".[2]GSM 06.54 (EN 301 250): "Digital cellular telecommunications system (Phase 2); Test sequencesfor the GSM Enhanced Full Rate (EFR) speech codec".[3]GSM 06.60 (EN 301 245): "Digital cellular telecommunications system (Phase 2); Enhanced FullRate (EFR) speech transcoding".[4]GSM 06.61 (EN 301 246): "Digital cellular telecommunications system (Phase 2); Substitution andmuting of lost frame for Enhanced Full Rate (EFR) speech traffic channels".[5]GSM 06.62 (EN 301 247): "Digital cellular telecommunications system (Phase 2); Comfort noiseaspects for Enhanced Full Rate (EFR) speech traffic channels".[6]GSM 06.81 (EN 301 248): "Digital cellular telecommunications system (Phase 2); Discontinuoustransmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels".[7]GSM 06.82 (EN 301 249): "Digital cellular telecommunications system (Phase 2); Voice ActivityDetector (VAD) for Enhanced Full Rate (EFR) speech traffic channels".3Definitions and abbreviations3.1DefinitionsDefinition of
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