Nrov Codecs Siv VoIP Apps thiab Devices
Thaum koj hu lub suab hu hauv Internet los ntawm Voice IP (VoIP) los yog ntawm lwm tus tes hauj lwm, lub suab yuav tsum tau encoded rau hauv cov ntaub ntawv, thiab vice versa. Nyob rau hauv tib txoj kev, cov ntaub ntawv yog cov nyom xws li tias nws txoj kev sib kis ceev dua thiab qhov kev hu tshaj yog qhov zoo dua. Cov cim no yog tau los ntawm codecs (uas yog luv rau encoder decoder).
Muaj ntau yam codecs suab, video, fax thiab ntawv.
Hauv qab no yog cov npe ntawm cov codecs uas feem ntau rau VoIP. Raws li tus neeg siv, koj yuav xav tias koj muaj tsawg ua nrog rau cov no, tab sis nws yeej yog qhov zoo los paub txog qhov tsawg kawg nkaus txog lawv, vim tias koj yuav tsum txiav txim siab ib hnub hais txog cov codecs hais txog VoIP hauv koj lub lag luam; los yog tsawg kawg yog ib hnub twg yuav nkag siab lo lus ntawm Greek VoIP hais lus.
Ib qho kev pib qhov twg uas koj yuav raug hu los ua kom paub cov codecs yog thaum koj xav txog ib qho software lossis hardware ua ntej koj yuav. Piv txwv li, koj yuav txiav txim siab seb puas yuav nruab qhov kev pabcuam hauv kev hu no lossis qhov ntawd raws li cov codecs uas lawv muab rau koj hu nrog regards rau koj cov kev xav tau. Ntxiv thiab, tej lub xov tooj muaj cov codecs kos uas koj xav tau xav ua ntej investing rau.
Hom VoIP Codecs
| Codec | Bandwidth / kbps | Lus tawm |
| G.711 | 64 | Xa cov lus hais meej txog kev sib txuas lus. Cov kev cai ntawm processor tsawg heev. Yuav tsum muaj tsawg kawg yog 128 kbps rau ob txoj kev. Nws yog ib qho ntawm cov qub codecs ib ncig (1972) thiab ua haujlwm zoo tshaj plaws hauv high bandwidth, uas ua rau nws tsis tshua muaj nyob rau hauv Internet tab sis tseem zoo rau LANs. Nws muab ib qho MOS ntawm 4.2 uas yog siab heev, tab sis cov neeg mob siab yuav tsum tau ntsib. |
| G.722 | 48/56/64 | Txhim kho rau kev sib txawv thiab kev siv bandwidth yog txum nrog cov kev sib txoos. Nws captures ranges ntawm zaus zaus li loj li G.711, ua rau zoo dua thiab clarity, ze rau los yog zoo dua nrog PSTN. |
| G.723.1 | 5.3 / 6.3 | High compression nrog zoo suab. Siv tau dial-up thiab nrog cov khiv pob qis uas tsis tshua pom kev, vim nws ua haujlwm nrog tsawg tsawg tus nqi. Nws, li cas los xij, yuav tsum tau siv zog ntxiv processor. |
| G.726 | 16/24/32/40 | Ib qho kev paub ntawm G.721 thiab G.723 (sib txawv los ntawm G.723.1) |
| G.729 | 8 | Kev siv zoo tshaj bandwidth. Txaus siab rau. Qhov no yog ib qho kev txhim kho lwm cov npe ntawm cov npe xws li npe, tab sis nws tau ntawv tso cai, lub ntsiab lus tsis pub dawb. Cov neeg siv qhov kawg siv tsis them rau daim ntawv tso cai no thaum lawv yuav kho vajtse (xov tooj poob haujlwm lossis gateways) uas siv nws. |
| GSM | 13 | High compression ratio. Dawb thiab muaj nyob rau hauv ntau yam kho vajtse thiab software platforms. Qhov qub encoding yog siv hauv GSM xov tooj ntawm tes (paub cov qauv siv niaj hnub no). Nws muaj MOS ntawm 3.7, uas tsis yog phem. |
| iLBC | 15 | Taw rau hauv Internet Qib Siab Tus Npe Codec. nws tau tam sim no tau txais los ntawm Google thiab yog dawb xwb. Robust kom pob ntawv poob, nws yog siv los ntawm ntau VoIP apps tshwj xeeb tshaj yog cov uas qhib qhov chaw. |
| Speex | 2.15 / 44 | Minimizes bandwidth cov kev pab los ntawm kev siv cov kab nce kuj nce nqi. Nws yog ib qho ntawm cov codecs uas nyiam tshaj plaws hauv ntau hom VoIP apps. |
| SILK | 6 txog 40 xyoo | SILK tau tsim los ntawm Skype thiab tam sim no muaj ntawv tso cai, yog muaj qhib qhov chaw dawb, uas tau ua ntau lwm cov apps thiab cov kev pab cuam los siv. Nws yog lub hauv paus rau tus tshiab codec hu ua Opus. WhatsApp yog ib qho piv txwv ntawm ib qho app siv Opus codec rau lub suab hu. |