Kube nokushintsha okukhulu okuvela ku-analog kuya kokusakazwa kwe-TV e-US e-US ngoJuni 12, 2009, okwakushintsha kokubili indlela abathengi abathola ngayo nokubuka i-TV, kanye nokushintsha ukuthi yiziphi i-TV ezitholakalayo ukuthenga.
Nakuba ukudluliselwa kwethelevishini kushintshe kusuka ku-analog kuya kudijithali e-US ngoJuni 12, 2009, kusekhona abathengi abangase babukele iziteshi ezimbalwa ezisebusweni ze-analog TV, bhalisela amasevisi we-TV e-analog, kanye / noma baqhubeke bebuka ividiyo ye-analog imithombo, njenge-VHS, noma i-analog, i-digital, noma i-HDTV. Ngenxa yalokho, izici ze-TV ye-analog namanje kuyisici esibalulekile okufanele siqaphele.
Ama-Basic Basics TV
Umehluko phakathi kwe-Analog TV ne-Digital TV usuqalile ngendlela isignali ye-TV idluliselwa ngayo noma idluliselwa kusuka emthonjeni kuya ku-TV, okusho ukuthi ichaza uhlobo lwe-TV umthengi adinga ukuyisebenzisa ukuthola isignali. Lokhu kusebenza futhi endleleni ibhokisi lokuguqula i-DTV (Thenga kusuka ku-Amazon) kufanele idlulisele isignali ku-TV ye-analog, ebalulekile kulabo abathengi abasebenzisa abaguquli be-DTV ukuthola izinhlelo zethelevishini kuseti ye-analog TV .
Ngaphambi kokuba ushintsho lwe-DTV lube khona, amasignali ajwayelekile e-analog TV adluliselwa ngendlela efana nomsakazo.
Eqinisweni, isignali yevidiyo yethelevishini ye-analog yasakazwa ku-AM, kanti umsindo wawudluliselwa ku-FM. ngenxa yalokho, ukuhanjiswa kwe-TV ye-analog kwakungaphansi kokuphazanyiswa, njengokugubha kanye neqhwa, kuye ngokuthi ibanga nendawo indawo ye-TV ethola isignali.
Ngokungeziwe, inani le- bandwidth elinikezwe isiteshi se-analog TV livimbela isinqumo kanye nekhwalithi yonke yesithombe. I-standard analog TV yokudlulisela (e-US) ibizwa ngokuthi i- NTSC .
I-NTSC yayiyinqubo yase-US eyamukelwa ngo-1941, futhi yaqala ukusetshenziswa kakhulu ngemva kweMpi Yezwe II. I-NTSC incike kumgqa we-525, 60 field / 30 ozimele-wesibili ohlelweni lwe-60Hz lokudlulisa nokubonisa izithombe zevidiyo. Lena yinkimbinkimbi ehleliwe lapho ifreyimu ngayinye iskena emikhawulweni emibili yemigqa engu-262, ehlangene ukuze ibonise uhlaka lwevidiyo ngemigqa engu-525 yokuskena.
Lolu hlelo lusebenza, kodwa ukukhipha okukodwa ukuthi ukusabalalisa i-TV yombala akuyona ingxenye ye-equation lapho uhlelo luvunyelwe ukusetshenziswa kwezebhizinisi kanye nabathengi. Ngenxa yalokho, ukusetjenziswa kombala kwifomathi ye-NTSC ngo-1953 bekulokhu kubuthakathaka kwesistimu, ngakho-ke igama le-NTSC laziwa ngabachwepheshe abaningi ngokuthi "Akukaze kube kabili umbala ofanayo". Uqaphele ukuthi ikhwalithi yombala nokuvumelana kuyahlukahluka kancane phakathi kweziteshi?
Ama-Basics e-Digital Digital nokuhlukana kusuka ku-Analog TV
Ngakolunye uhlangothi, i- TV ye-Digital , noma i- DTV , idluliselwa njengezinkinobho zedatha, njengemininingwane yedokhumenti ebhaliwe noma indlela umculo noma ividiyo ebhalwe kwi-CD, i-DVD, noma i-Blu-ray Disc. Isignali yedijithali inamalungu ka-1 no-0. Lokhu kusho ukuthi isignali ehanjiswayo "ku" noma "ku-off". Njengoba izimpawu zedijithali ziphelile, ikhwalithi yesignali ayifani phakathi kwebanga elithile elihlobene nomkhiqizo wamandla we-transmitter.
Ngamanye amazwi, inhloso yobuchwepheshe bokudlulisela i-DTV ukuthi umbukeli ubona isithombe noma akukho lutho. Akukho ukulahlekelwa kwesignali kancane kancane njengoba ibanga elivela kumthumeli liyakhula. Uma umbukeli ekude kakhulu nomsakazo noma endaweni engathandeki, akukho lutho ongakubona.
Ngakolunye uhlangothi, ngokungafani ne-TV ye-analog, i-digital yedijithali iklanyelwe kusukela emhlabathini ukuze ithathelwe zonke izici eziyinhloko zesignali yethelevishini: B / W, umbala, nomsindo futhi ungadluliselwa njenge- interlaced (imigqa efakwe ku ezinye izinkambu) noma okuqhubekayo (imigqa ekhishwa ngesignali elandelanayo) . Ngenxa yalokho, kukhona ubuqotho obukhulu nokuguquguquka kokuqukethwe kwesignali.
Ngaphezu kwalokho, kusukela isignali ye-DTV enziwe "amabhuzu", usayizi ofanayo we-bandwidth othatha isignali ye-analog TV yamanje, angakwazi ukufaka isithombe esiphezulu sekhwalithi efonini, kodwa isikhala esingeke sisetshenziselwe isignali ye-TV ingasetshenziselwa amavidiyo angeziwe, alalelwayo, kanye nemibhalo yombhalo.
Ngamanye amazwi, abasakaza banganikeza izici eziningi, ezifana nomsindo ozungezile, umsindo womculo amaningi, izinsizakalo zombhalo, nokunye okuningi esikhaleni esifanayo manje esinezibonakaliso ze-analog TV evamile. Kodwa-ke, kunesinye esinye inzuzo ekwenzeni isikhala somsakazo we-Digital TV; ikhono lokudlulisa isignali ye- High Definition (HDTV) .
Okokugcina, omunye umehluko phakathi kwe-Digital TV ne-Analog TV yikhono lokusakaza uhlelo olusayizifomethi yangempela yesikrini (16x9) . Ukuma kwesithombe kakhulu kufana nokuma kwesikrini se-movie, okwenza umbukeli abone i-movie njengomenzi wefilimu. Ngezemidlalo, ungathola okuningi kwesenzo kudubula olulodwa lwekhamera, njengokubuka lonke ubude bebhola lebhola ngaphandle kokubukeka sengathi lide elide kude nekhamera.
I-16x9 ye-aspect ratio ye-TV ingabonisa izithombe ezibuhlaza ngaphandle kwendawo enkulu yesithombe esithathwe ngamabha amnyama phezulu nangaphansi kwesithombe esibuhlaza, yilokho okubonayo uma izithombe ezinjalo zikhonjiswa kwi-TV evamile. Ngisho nemithombo engekho ye-HDTV, njenge-DVD ingabuye isebenzise i-TV ye-19x9 ye-TV ratio.
Kusuka ku-DTV kuya ku-HDTV nangaphezulu kwe-...
Enye into ethakazelisayo ukukhomba ukuthi ukuguqulwa kusuka ku-Analog kuya ku-Digital TV kuyisinyathelo esisodwa kuphela. Yize wonke ama-HDTV ayimidlalo ye-Digital TVS, akuwona wonke ama-TV we-TV we-HD ayi-HD, futhi akuwona wonke ama-TV we-Digital ama-HDTV. Ukuze uthole okwengeziwe ngalezi zinkinga, kanye nokuthi u-4K, kanye no-8K, izici ku-mix, hlola izihloko ezilandelayo zomngane ku: