
puurti raetu

puurti raetu (fr ledhaa gsm-fr ledhaa gsm 06.10 ledhaa konnisaarlu kevalam gsm) gsm digital mobile phone vyavasthalo upayoginchina modati digital speach coding pramaanam. idhi leanier predictive coding (elpisi) nuu upayogistundi. codec yokka bitt raetu 13 kbit/s, ledhaa 1.625 bits/audeo sample (tarachugaa 33 baitlu/20 mii. s ledhaa 13.2 kbit/s kuu pyaad cheyabadutundi). coded prasangam yokka naanhyata aadhunika pramaanaala prakaram chaalaa takkuvagaa undhi, conny abhivruddhi samayamlo (1990la praarambhamlo) idhi ganana sanklishtata mariyu naanhyata madhya manchi raajee, sekanuku oka million cherpulu mariyu gunakaala kramamlo matrame avasaram. prapanchavyaaptamgaa networklalo codec ippatikee vistrutamgaa upayoginchabadutondi. kramamga fr merugaina puurti raetu (efr) mariyu anukuula bahula-raetu (amr) pramaanaalatoo bharti cheyabadutundi, ivi takkuva bitt retutho chaalaa ekkuva prasangam naanhyatanu andistaayi.
saanketikata.
"gsm-fr" anedi etsi 06.10 (ets 300 961) loe perkonabadindi mariyu idhi rpe-ltp (regular pulls excitation-long turm prediction) speach coding namuunaapai aadharapadi untundi. aneka itara leanier predictive coding (elpisi) speach kodekla maadirigaane, leanier prediction anedi synthesis filterlo upayoginchabadutundi. ayithe, chaalaa aadhunika prasanga kodekla maadirigaa kakunda, sarala anchanaa yokka kramam 8 matrame. aadhunika irukaina byaand prasangam kodeklalo kramam saadhaaranamgaa 10 mariyu wideband prasangam kodeklalo kramam saadhaaranamgaa 16 untundi.
speach encoder 8 kz namuunaa retutho 13 bitt leanier pcmని angeekaristundi.
idhi phone ledhaa kampyootarlooni analog-tuu-digital convertor nundi neerugaa kaavacchu ledhaa lookup tabletho ps tn nundi g.711 8-bitt naan leanier eah-laa ledhaa micro-laa pcm nundi maarchavacchu.
gsmloe, encode cheyabadina prasangam gsm 05.03 loe perkonna chaanal encoderku pampabadutundi. sweekarinche disalo, viloma karyakalapalu jarugutaayi.
codec 20 ms vistarinchi unna 160 namuunaa framelapy panichestundi, kabatti idhi anantamaina vegavantamaina sipus mariyu sunna network jaapyamtho kooda saadhyamayye kaneesa transcoder alasyam. transcoder alasyam 30 ms kante takkuvagaa undaali anedi kaaryaacharana avasaram. transcoder alasyam anedi encoder input vadda 160 namuunaala speach frame takshanam andukovadam mariyu ventane punarnirminchina 160 speach namuunaalanu speach decoder 8 kz namuunaa retutho avt-putt cheyadam madhya samaya viraamgaa nirvachinchabadindi.
amalu.
uchita "libgsm" codec gsm puurti raetu audeoni encode chesi decode cheyavachu. "libgsm" nuu 1992-1994 nuu jutta degenere mariyu carsten borman abhivruddhi chesaaru, taruvaata berlinloni technische universita vadda. gsm speach frame 32.5 baitlu kabatti, eee amalu gsm frame yokka 33-bite nibul-padded praatinidhyaanni kooda nirvachinchindi (idhi, 50/s frame retutho, gsm bitt raetu 13.2 kbit/s anie tappu vaadanaku aadharam). eee kodeknu gsm audeo maddatunu andinchadaaniki vainga kooda sankalanam cheyavachu.
libgsm aadhaaramgaa mudi gsm 06.10 kosam oka winamp plugin kooda undhi.
gsm 06.10 voip softwarelo kooda upayoginchabadutundi, udaaharanaku ekigaa, cutecom, linfone, austeric (pbx), ventriloo mariyu itarulalo.