SIST EN 300 971 V6.0.1:2003

Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Comfort noise aspects for the half rate speech traffic channels (GSM 06.22 version 6.0.1 Release 1997)

Upgrade from Phase 2+ to Release 1997

Digitalni celični telekomunikacijski sistem (faza 2+) – Govor s polovično hitrostjo – Vidiki znosnega šuma pri prometnih kanalih s polovično hitrostjo govora (GSM 06.22, različica 6.0.1, izdaja 1997)

General Information

• 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 300 971 V6.0.1 (1999-06) - Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Comfort noise aspects for the half rate speech traffic channels (GSM 06.22 version 6.0.1 Release 1997)

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; Comfort noise aspects for the half rate speech traffic channels (GSM 06.22 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 300 971 Version 6.0.1SIST EN 300 971 V6.0.1:2003en01-december-2003SIST EN 300 971 V6.0.1:2003SLOVENSKI
STANDARD
EN 300 971 V6.0.1 (1999-06)European Standard (Telecommunications series)Digital cellular telecommunications system (Phase 2+);Half rate speech;Comfort noise aspects for the half ratespeech traffic channels(GSM 06.22 version 6.0.1 Release 1997)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRSIST EN 300 971 V6.0.1:2003

ETSIEN 300 971 V6.0.1 (1999-06)2GSM 06.22 version 6.0.1 Release 1997ReferenceDEN/SMG-110622Q6 (8zo0300o.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 300 971 V6.0.1:2003

ETSIEN 300 971 V6.0.1 (1999-06)3GSM 06.22 version 6.0.1 Release 1997ContentsIntellectual Property Rights.4Foreword.41Scope.62References.63Definitions, symbols and abbreviations.63.1Definitions.63.2Symbols.73.3Abbreviations.74General.75Functions on the transmit (TX) side.85.1Background acoustic noise evaluation.85.2Modification of the speech encoding algorithm during SID frame generation.95.3SID-frame encoding.106Functions on the receive (RX) side.116.1Averaging of the GS parameters.116.2Comfort noise generation and updating.127Computational details.12Annex A (informative):Change Request History.13History.14SIST EN 300 971 V6.0.1:2003

ETSIEN 300 971 V6.0.1 (1999-06)4GSM 06.22 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 gives the detailed requirements for the correct operation of the background acoustic noiseevaluation, noise parameter encoding/decoding and comfort noise generation within the digital cellulartelecommunications system. The present document is part of a series covering the half rate speech traffic channels asdescribed below:GSM 06.02"Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate speechprocessing functions".GSM 06.06"Digital cellular telecommunications system (Phase 2+); Half rate speech; ANSI-C code for theGSM half rate speech codec".GSM 06.07"Digital cellular telecommunications system (Phase 2+); Half rate speech; Test sequences for theGSM half rate speech codec".GSM 06.20"Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate speechtranscoding".GSM 06.21"Digital cellular telecommunications system (Phase 2+); Half rate speech; Substitution and mutingof lost frames for half rate speech traffic channels".GSM 06.22"Digital cellular telecommunications system (Phase 2+); Half rate speech; Comfort noiseaspects for half rate speech traffic channels".GSM 06.41"Digital cellular telecommunications system (Phase 2+); Half rate speech; DiscontinuousTransmission (DTX) for half rate speech traffic channels".GSM 06.42"Digital cellular telecommunications system (Phase 2+); Half rate speech; Voice Activity Detector(VAD) for half rate speech traffic channels".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.SIST EN 300 971 V6.0.1:2003

ETSIEN 300 971 V6.0.1 (1999-06)5GSM 06.22 version 6.0.1 Release 1997Proposed 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 300 971 V6.0.1:2003

ETSIEN 300 971 V6.0.1 (1999-06)6GSM 06.22 version 6.0.1 Release 19971ScopeThe present document gives the detailed requirements for the correct operation of the background acoustic noiseevaluation, noise parameter encoding/decoding and comfort noise generation in GSM Mobile Stations (MS)s and BaseStation Systems (BSS)s during Discontinuous Transmission (DTX) on half rate speech traffic channels.The requirements described in the present document are mandatory for implementation in all GSM MSs capable ofsupporting the half rate speech traffic channel.The receiver requirements are mandatory for implementation in all GSM BSSs capable of supporting the half ratespeech traffic channel, the transmitter requirements are only for those where downlink DTX will be used.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 telecommunication system (Phase 2+); Abbreviations and acronyms".[2]GSM 06.20: "Digital cellular telecommunications system (Phase 2+); Half rate speechtranscoding".[3]GSM 06.41: "Digital cellular telecommunications system (Phase 2+); Half rate speech;Discontinuous Transmission (DTX) for half rate speech traffic channels".[4]GSM 06.42: "Digital cellular telecommunications system (Phase 2+); "Half rate speech; VoiceActivity Detector (VAD) for half rate speech traffic channels".[5]GSM 06.06: "Digital cellular telecommunications system (Phase 2+); Half rate speech; ANSI-Ccode for the GSM half rate speech codec".3Definitions, symbols and abbreviations3.1DefinitionsFor the purpose of the present document, the following definitions apply:frame: Time interval of 20 ms corresponding to the time segmentation of the half rate speech transcoder, also used as ashort term for a traffic frame.H(Z): Combination of the short term (spectral) filter A(z) and the spectral weighting filter W(z).SID codeword: Fixed bit pattern for labelling a traffic frame as a SID frame.SID field: The bit positions of the SID codeword within a SID frame.SID frame: Frame characterized by the SID (Silence Descriptor) codeword. It conveys information on the acousticbackground noise.SIST EN 300 971 V6.0.1:2003

ETSIEN 300 971 V6.0.1 (1999-06)7GSM 06.22 version 6.0.1 Release 1997SP flag: SPeech flag.speech frame: Traffic frame that cannot be classified as a SID frame.VAD flag: Voice Activity Detector flag.W(Z): Spectral weighting filter of the GSM half rate speech codec.Other definitions of terms used in the present document can be found in GSM 06.20 [2] and GSM 06.41 [3]. The overalloperation of DTX is described in GSM 06.41 [3].3.2SymbolsFor the purpose of the present document, the following symbols apply:GSEnergy tweak parameter.R0Frame energy value.R(i)Unquantised (normalized) autocorrelation sequence.rjOptimal reflection coefficient.
bSUM ( x(n) )
= x(a) + x(a+1) + . + x(b-1) + x(b);
(Accumulation). n=aGSP0 codeword Vector quantization index, joint vector quantization of the parameters GS and P0.P0Power contribution of the first excitation vector as a fraction of the total excitation power at asubframe.3.3AbbreviationsFor the purpose of the present document, the following abbreviations apply:AFLATAutocorrelation Fixed Point LAttice Technique (used in the GSM half rate speech codec for thevector quantization of the LPC coefficients)BSSBase Station SystemDTXDiscontinuous TransmissionETSEuropean Telecommunication StandardGSMGlobal System for Mobile communicationsMSMobile StationSIDSIlence DescriptorRXReceiveTXTransmitVADVoice Activity DetectorVQVector QuantizationFor abbreviations not given in this subclause, see GSM 01.04 [1].4GeneralA problem when using DTX is that the background acoustic noise, which is transmitted together with the speech, woulddisappear when the radio transmission is switched off, resulting in a modulation of the background noise. Since the DTXswitching can take place rapidly, it has been found that this effect may be annoying for
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