Umehluko phakathi kwe-digital walkie-talkie ne-analog walkie-talkie

Njengoba sonke sazi, i-walkie-talkie iyisisetshenziswa esibalulekile ohlelweni lwe-intercom engenantambo.I-walkie-talkie isebenza njengesixhumanisi sokudluliswa kwezwi ohlelweni lokuxhumana olungenantambo.I-walkie-talkie yedijithali ingahlukaniswa ngamashaneli e-frequency division multiple (FDMA) kanye ne-time division multiple access(TDMA).Ngakho-ke lapha siqala ngobuhle nobubi bamamodeli amabili kanye nomehluko phakathi kwe-digital and analog walkie-talkies:

1.Izindlela zokucubungula iziteshi ezimbili ze-digital walkie-talkie

I-A.TDMA(Isigaba Sesikhathi Ukufinyelela Okuningi): Imodi ye-TDMA enezikhala ezimbili yamukelwa ukuze kuhlukaniswe isiteshi esingu-12.5KHz sibe izikhala ezimbili, futhi isikhathi ngasinye indawo ingadlulisela izwi noma idatha.

Izinzuzo:

1. Phinda kabili umthamo wesiteshi wesistimu ye-analogi ngokuphinda

2. Omunye ophindayo wenza umsebenzi wabaphindayo ababili futhi anciphise ukutshalwa kwezimali kwemishini yehadiwe.

3. Ukusebenzisa ubuchwepheshe be-TDMA kuvumela amabhethri e-walkie-talkie ukuthi asebenze isikhathi eside esingafika ku-40% ngaphandle kokudlulisela okuqhubekayo.

Ububi:

1. Izwi nedatha akukwazi ukudluliselwa ngesikhathi esifanayo.

2. Uma isiphindaphinda ohlelweni sihluleka, isistimu ye-FDMA izolahlekelwa isiteshi esisodwa kuphela, kuyilapho isistimu ye-TDMA izolahlekelwa amashaneli amabili.Ngakho-ke, ukwehluleka ukwenza buthaka amandla kubi kune-FDMA.

I-B.FDMA(I-Frequency Division Multiple Access):Imodi ye-FDMA yamukelwe, futhi umkhawulokudonsa wesiteshi ungu-6.25KHz, okuthuthukisa kakhulu ukusetshenziswa kwamafrikhwensi.

Izinzuzo:

1. Kusetshenziswa ishaneli yebhendi engu-6.25KHz emincane kakhulu, izinga lokusebenzisa i-spectrum lingaphinda liphindwe kabili uma liqhathaniswa nesistimu ye-analog ye-analogi engu-12.5KHz ngaphandle kwesiphindayo.

2. Esiteshini esingu-6.25KHz, idatha yezwi nedatha ye-GPS ingadluliselwa ngesikhathi esifanayo.

3. Ngenxa yesici sokulola ibhande elincane lesihlungi esamukelayo, ukuzwela kokwamukela kwe-id yokuxhumana kwaba ngcono ngempumelelo kusiteshi esingu-6.25KHz.Futhi umphumela wokulungiswa kwamaphutha, ibanga lokuxhumana cishe lilikhulu ngo-25% kunomsakazo we-analog FM wendabuko.Ngakho-ke, ukuxhumana okuqondile phakathi kwezindawo ezinkulu nemishini yomsakazo, indlela ye-FDMA inezinzuzo eziningi.

Umehluko phakathi kwe-digital walkie-talkie kanye ne-analog walkie-talkie

1.Ukucubungula izimpawu zezwi

I-Digital walkie-talkie: imodi yokuxhumana esekelwe kudatha ethuthukiswe iphrosesa yesiginali yedijithali enombhalo wekhodi wedijithali othize kanye nokumoduliswa kwe-baseband.

I-analog walkie-talkie: imodi yokuxhumana elungisa izwi, ukusayinda, namagagasi-amagagasi aqhubekayo ukuya kumvamisa yenkampani yenethiwekhi ye-walkie-talkie futhi ithuthukiswe ngokukhulisa.

2.Ukusetshenziswa kwezinsiza ze-spectrum

I-Digital walkie-talkie: efana nobuchwepheshe bedijithali yeselula, i-digital walkie-talkie ingalayisha abasebenzisi abaningi esiteshini esinikeziwe, ithuthukise ukusetshenziswa kwe-spectrum, futhi isebenzise kangcono izinsiza ze-spectrum.

I-analog walkie-talkie: kunezinkinga ezinjengokusetshenziswa okuncane kwezisetshenziswa zemvamisa, ukugcinwa kwemfihlo kwezingcingo okungekuhle, kanye nohlobo olulodwa lohlobo lwebhizinisi, olungasakwazi ukuhlangabezana nezidingo zokuxhumana zamakhasimende emboni.

3. Ikhwalithi yekholi

Ngenxa yokuthi ubuchwepheshe bezokuxhumana bedijithali bunamandla okulungisa amaphutha esistimu, futhi buqhathaniswa ne-analog walkie-talkie, bungafinyelela ikhwalithi engcono yezwi neyomsindo endaweni yesignali ebanzi futhi ithole umsindo omncane womsindo kune-analog walkie-talkie.Ngaphezu kwalokho, uhlelo lwedijithali lunokucindezela okuhle kakhulu komsindo wendawo futhi lungalalela amazwi acacile ezindaweni ezinomsindo.