Iikhowudi eziqhelekileyo ezisetyenziswe kwi-VoIP Apps kunye namadivayisi
Xa wenza iifowuni nge-Intanethi ngezwi eliphezulu kwi-IP (VoIP) okanye kwezinye iinqununu zedijithali, ilizwi kufuneka lifakwe kwidijithali yedatha, kwaye ngokufanayo. Kwinkqubo efanayo, idatha icinezelwe ukuba ukuhanjiswa kwayo kukhawuleza kwaye amava okubiza angcono. Olu khonkco lufezwa ngamacodec (okufutshane ukucacisa ikhowudi).
Kukho ezininzi ii- codec ze-audio, ividiyo, ifeksi kunye neetekisi.
Ngezantsi uludwe lwezona codec eziqhelekileyo zeVoIP. Njengomsebenzisi, usenokucinga ukuba unento encinci yokwenza ntoni na oku, kodwa kukulungele ukukwazi ubuncinci malunga nabo, kuba unokufuneka wenze izigqibo ngolunye usuku ngokuphathelele ii-codec malunga ne-VoIP kwishishini lakho; okanye ubuncinane mhlawumbi ngolunye usuku unokuqonda amagama athile ase-Greek VoIP abantu abathethayo.
Enye imeko apho ungabizwa khona ukuba ube nengqiqo yee-codec yilapho kufuneka uqwalasele isiqwenga sesofthiwe okanye i-hardware ngaphambi kokuthenga. Ngokomzekelo, unokwenza isigqibo malunga nokuba ufake ifowuni yefowuni okanye enye isekelwe kwiikodec ezinikezela ngeefowuni zakho malunga neemfuno zakho. Kwakhona, ii-fowuni ezithile zineenkcukacha ze-codec ezinokuthi zifune ukuqwalasela phambi kokutshala imali.
IiCodec eziqhelekileyo zeVoIP
| Codec | Bandwidth / kbps | Amazwana |
| G.711 | 64 | Ukhulula ukuhanjiswa kwentetho echanekileyo. Iimfuno zeprojekithi eziphantsi kakhulu. Imfuno ubuncinane i-128 kbps ngeendlela ezimbini. Ngomnye wama-codec endala (1972) kwaye usebenza kakuhle kwi-bandwidth ephakamileyo, okwenza kube yinto engapheliyo kwi-Intanethi kodwa ilungile kwi-LANs. Inika i-MOS ye-4.2 ephakamileyo kakhulu, kodwa iimeko ezifanelekileyo kufuneka zidibane. |
| G.722 | 48/56/64 | Ukutshintshela kwiinkcenkcesho ezahlukeneyo kunye nomda womda wokugcina umgca uya kugcinwa ngoxinaniso lwenethiwekhi. Iyakubamba ububanzi beemvama eziphindwe kabini zikhulu njengeG.711, okubangelwa kumgangatho ogqithisileyo nokucacileyo, ngokufutshane okanye nokuba ngcono kunokuba ne-PSTN. |
| G.723.1 | 5.3 / 6.3 | Ukuxinwa okuphezulu kunye nomsindo ophezulu. Unokusebenzisa ngokutshintshela kunye neendawo eziphantsi kwee-bandwidth, ekubeni isebenza ngezinga eliphantsi kakhulu. Kodwa ke, kufuna amandla amaninzi okuprojekthi. |
| G.726 | 16/24/32/40 | Inguqu ephuculweyo yeG.721 kunye ne-G.723 (eyahlukileyo kwi-G.723.1) |
| G.729 | 8 | Ukusetyenziswa ngokugqithiseleyo komda. Iphutha lokunyamezela. Lo ngowokuphucula ngaphezu kwamanye amagama anjalo, kodwa ilayisenisi, intsingiselo engenanto. Abasebenzisi bokugqibela bahlawule ngokukhawuleza le layisensi xa bethenga i-hardware (ifowuni isetyenzisiwe okanye iisango) eziphumezayo. |
| GSM | 13 | Umlinganiselo ophezulu wokunciphisa. Ikhululekile kwaye ifumaneka kwiinkalo ezininzi zeekhompyutha kunye neeprosoft. I-encoding efanayo iya kusetyenziswa kwii-cellphone ze-GSM (iinguqu eziphuculweyo zisetyenziswa rhoqo namhlanje). Inika iMOS ye-3.7, engalunganga. |
| iLBC | 15 | Ubeka i-intanethi yexabiso le-Bit Low Codec. ngoku sele ifunyenwe yiGoogle kwaye ikhululekile. Ukulungelelanisa ukulahleka kwepakethe, isetyenziselwa ezininzi iinkonzo zeVoIP ngakumbi ezo zinezixhobo ezivulekile. |
| Speex | 2.15 / 44 | Ukunciphisa ukusetyenziswa kwebhanti ngokusebenzisa umlinganiselo werhafu eguqukileyo. Ngenye yee-codec ezikhethiweyo ezisetyenziselwa ezininzi zokusebenza zeVoIP. |
| SILK | 6 ukuya ku-40 | I-SILK ithuthukiswe ngu-Skype kwaye ngoku ilayisenisi yavela, ifumaneka njenge-freeware evulekile-source, eyenze ezinye iinkonzo ezininzi kunye neenkonzo zokuzisebenzisa. Yisiseko se-codec entsha egama lingu-Opus. I-WhatsApp umzekelo we-app usebenzisa i-Opus codec yeefowuni zezwi. |