Ama-Codec adumile asetshenziselwa izinhlelo zokusebenza ze-VoIP namadivayisi
Uma wenza izingcingo zezwi phezu kwe-Intanethi nge- Voice Over IP (VoIP) noma kwamanye amanethiwekhi we-digital, izwi kufanele lifakwe kukhodi yedatha, futhi ngokufanayo. Ngenkambiso efanayo, idatha igcizelelwe kangangokuthi ukudluliselwa kwayo kuyashesha futhi isipiliyoni sokubiza singcono. Lokhu kukhonjelwa kutholakala ngama-codecs (okuyinto encane ye-encoder decoder).
Kunamakhodi amaningi we-audio, ividiyo, fax kanye nombhalo.
Ngezansi uhlu lwamakhodi ejwayelekile kakhulu we-VoIP. Njengomsebenzisi, ungase ucabange ukuthi awukwazi ukwenza okuncane lokho okuyikho, kodwa kuhlale kuhle ukwazi ubuncane ngabo, ngoba kungenzeka ukuthi wenze izinqumo ngelinye ilanga eziphathelene ne-codec ephathelene ne-VoIP ebhizinisini lakho; noma okungenani usuku olulodwa lungase luzwisise amanye amazwi kubantu abakhuluma isiGreki VoIP.
Isimo esithile lapho ungabizwa khona ukuze ube nomqondo we-codecs lapho kufanele ucabange ucezu lwesofthiwe noma i-hardware ngaphambi kokuthenga. Isibonelo, ungase unqume ukuthi ungafaka yini lolu hlelo lokusebenza lokushaya noma lowo olusekelwe kuma-codec abanikeza amakholi akho ngokuqondene nezidingo zakho. Futhi, amafoni athile anezinhlayiya ezifakiwe ezingabhekwa ukucatshangelwa ngaphambi kokutshala imali.
I-Common VoIP Codecs
| I-Codec | I-Bandwidth / kbps | Amazwana |
| G.711 | 64 | Ihambisa ukudluliswa kwenkulumo okuqondile. Izidingo eziphansi kakhulu zeprosesa. Izidingo okungenani 128 kbps ngendlela emibili. Ingenye yama-codec asendulo kunazo zonke ezungeze (1972) futhi isebenza kahle kakhulu ekukhuphukeni komkhawulokude, okwenza kube yinto engasasebenzi isikhathi se-intanethi kepha isabalulekile kuma-LAN. Inikeza i-MOS ye-4.2 ephakeme kakhulu, kodwa izimo ezifanele kufanele zihlangabezane nazo. |
| G.722 | 48/56/64 | Ukuvumelanisa kokuncintisana okuhlukile nokuhamba komkhawulokudonsa kugcinwa ngenhlanganisela yenethiwekhi. Iqoqa ububanzi bemvamisa kabili ngobukhulu njenge-G.711, okwenza kube nekhwalithi engcono nokucacile, eduze noma ngisho nangcono kune-PSTN. |
| G.723.1 | 5.3 / 6.3 | Ukucindezela okuphezulu nge-high quality audio. Ungasebenzisa ngokuzwakalisa futhi ngezindawo eziphansi ze-bandwidth, ngoba isebenza ngesilinganiso esincane kakhulu kancane. Kodwa, kudinga amandla amaningi okucubungula. |
| I-G.726 | 16/24/32/40 | Inguqulo engcono ye-G.721 ne-G.723 (ehlukile ku-G.723.1) |
| G.729 | 8 | Ukusetshenziswa komkhawulokudonsa omuhle kakhulu. Iphutha lokubekezela. Lokhu kuyithuthukisa ngaphezu kwamanye amagama afanayo, kepha ilayisensi, okusho ukuthi ayikhululekile. Abasebenzisi bokugcina bakhokhele ngokuqondile leli layisensi uma bethengisa i-hardware (isethi yefoni noma amasango) awenzayo. |
| GSM | 13 | Isilinganiso sokucindezela esiphakeme. Ikhululekile futhi itholakala kuma-platform amaningi we-hardware nesofthiwe. Ikhodi ye-Same isetshenziswe kumakhalekhukhwini weselula ye-GSM (izinguqulo ezithuthukisiwe zivame ukusetshenziswa namuhla). Inikeza i- MOS ye-3.7, engesibi. |
| ILBC | 15 | Ihamba nge-Intanethi ye-Bit Low Codec. manje sesitholiwe yi-Google futhi ikhululekile. Ehle kakhulu ekulahlekeni kwepakethe, isetshenziswa yizinhlelo zokusebenza eziningi ze-VoIP ikakhulukazi labo abanomthombo ovulekile. |
| Speex | 2.15 / 44 | Kunciphisa ukusetshenziswa komkhawulokudonsa ngokusebenzisa isilinganiso se-bit variable. Ngenye yezincodec ezikhethwayo kakhulu ezisetshenziselwa izinhlelo zokusebenza eziningi ze-VoIP. |
| SILK | 6 kuya ku-40 | I-SILK ithuthukiswe yi-Skype futhi manje ilayisensi, itholakala njenge-freeware evulekile-source, okwenze ezinye izinhlelo zokusebenza eziningi namasevisi ukukusebenzisa. Yisisekelo se-codec entsha okuthiwa i- Opus. I-WhatsApp iyisibonelo sohlelo lokusebenza usebenzisa i-Opus codec yamakholi wezwi. |