Pan-European speech coding standard for digital mobile radio
نویسنده
چکیده
A new Pan-European digital cellular mobile radio system has bccn under planning since 19~,2 within CEPT GSM {Groupc Specialc Mol',ilc). The pai',er presents the progress of the studies that wcrc initiated by the joint Speech coding Experts Group created by CEPT TR3 and COST 2117 to define :m algorithm to encode the speech at around Ill kbit/s for this purpose. in a coordinated evaluation programme. 6 candidate codecs wcrc compared with respect to speech quality, transmission delay and case of implementation. As a result of this evaluation, a Regular Pulse Excitation/Long-Term Prediction 1.1~(" (RPE-LTP) coding algorithm has been selected as the basis for the standard for the Pan-European cellular system. Zusammenfassung. Ein neucs zellularcs, digitales Mobilfunksystcm. welches den Gesamt-Europiiischcn Raum umfasscn soil. ist im Planungsstadium scit 1982. Dic Planung wird abgcwickclt inncrhalb dcr Spczialgruppc Mabilsystcmc ICEPT GSM). Der Beitrag zcigt den Fortgang dcr Arbciten auf. die initiicrt wurdcn durch cinc Gruppc votl Sprachkodicrungs-Expcrtcn; diese Gruppe wurdc durch CEPT/TR3 und dic "'COST Action 2117"" gcmcinsam gcgri.indet mit dcm Zicl. ci~,.'n Sprachkodicr-Algorithmus im Bcrcich yon 16 kbit/s zu dcfinicrcn. lm Rahmcn tines koordinicrtcn Tcstprogrammcs. wurdcn scchs Kodicrcr vcrglichcn ~'as ihrc Sprachqualit~.it. Vcrz(:,gcrung durch dic Signalverarbcitung und Einsetzbarkcit betraf. Aufgrund dcr Rcsultatc wurdc tin LPC-Algorithmus mit Reguliirpuls-Errcgung und Langzcit-Priidiktion als Standard fiir da.; curopawcilc Zcllularsystcna ausgcw~.ihlt. R6sum6. Un nouveau systOmc dc radio mobile ccllulairc ct numdriquc il couvcrturc curol,dcnnc a ('t~2 planific dcpuis.l~S2 ;~t I'intdricur du CEPT GSM (groupc Sl',t~cial nlt~bilc). L'articlc l',r6scntc la l~rogrcssiola tics 6ludcs qui ont ~2t6 mttlccs ctmjointcmcnt par Ic groupc d'cxl',crts cn codagc dc ia parole cr6c par CEPT TR3 ct ic pro.jet ( 'OST 2117 llotlr d6finir un algorithme afin dc coder la parole ~L environ 1~ kbit/s. Dans un programnle coordonn,~ d'dvaluation, nix codcurs candidats ont 6t6 compargs sur base dc la qu;tlitt~ tic la parole. du retard de la transmissiotl ct ,le ia facilitd d'implantation. A la suttc du rdsultat de cctlc dvaluation. I'algorithmc d'cxcitation ~t Impulsions R6guli0rcs cl dc Pr6dictitm LPC ;~ Long Tcrme (RPE-LPf') a 6td choisi commc base pour Icy standard', du syst0mc cellulairc pan-curopt3cn.
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ورودعنوان ژورنال:
- Speech Communication
دوره 7 شماره
صفحات -
تاریخ انتشار 1988