Kwakukho utshintsho olukhulu ukusuka kwi-analog ukuya kwi-digital ye-TV kwi-US kwi-Juni 12, 2009, eyatshintshela indlela abathengi abayifumana ngayo nokubukela iTV, kunye nokutshintsha ukuba yiyiphi i-TV ekhoyo ukuthenga.
Nangona ukuhanjiswa komabonwakude kushintshile kwi-analog kuya kwidijithali e-US ngoJuni 12, 2009, kusekho abathengi abangabuka ezimbalwa iziteshi zethelevishini ze-analog, zibhalisele kwiinkonzo ze-TV ze-analog kunye / okanye ziqhubeke zibukela ividiyo ye-analog imithombo, njengeVHS, nge-analog, digital, okanye ii-HDTV. Ngenxa yoko, iimpawu ze-TV ye-analog zisabalulekanga.
Basalog TV Basics
Ukwahlukana phakathi kwe-Analog TV kunye ne-Digital TV inomgxininiso kwindlela umyalezo weTV uhanjiswe ngayo okanye udluliselwe ukusuka kumthombo ukuya kwi-TV, leyo leyo ichaza uhlobo lweTV umthengi kufuneka alusebenzise ukufumana uphawu. Oku kusebenza kwindlela ibhokisi yokuguqula i-DTV (Ukuthenga kwi-Amazon) kufuneka idlulisele isalathisi kwi-TV ye-analog, ebalulekileyo kulabo abathengi abasebenzisa abaguquleli be-DTV ukufumana iprogram yomabonwakude kwi-set anal TV .
Ngaphambi kokuba uguqulelo lwe-DTV lube khona, iimpawu ze-TV zangaphambili ze-analog zazisasazwa ngendlela efana nerediyo.
Enyanisweni, umboniso wevidiyo womboniso we-analog wawusasazwa kwi-AM, ngelixa i-audio yayisasazwa kwi-FM. njengesiphumo, ukuhanjiswa kwe-TV ye-analog kwakuphantsi kokuphazamiseka, njengokugubha kunye nekhephu, kuxhomekeke kumgama kunye nommandla we-TV ofumana uphawu.
Ukongezelela, isixa somda womda we- bandwidth obelwe iseshoni ye-analog yeTV sikhankanya isisombululo kunye nomgangatho wonke womfanekiso. Umgangatho wokudluliselwa kwe-TV ye-analog (e-US) ubizwa ngokuba yi- NTSC .
I-NTSC yimiqathango yase-US eyamkelwa ngowe-1941, kwaye yavela ekusebenziseni ngokubanzi emva kweMfazwe Yehlabathi II. I-NTSC isekelwe kumgca we-525, i-60 kwimihlaba / iifowuni ezingama-30 ngeyesibili kwi-60Hz inkqubo yokuhambisa nokubonisa imifanekiso yevidiyo. Le nkqubo yinkqubo ekhethiweyo apho isakhelo ngasinye sithathwa kwiinkalo ezimbini zemizila engama-262, ehlanganiselwe ukubonisa isakhelo sevidiyo kunye nemigca ye-525 yokukhangela.
Le nkqubo isebenza, kodwa enye impendulo yimibala ye-TV ayiyeyona nxalenye ye-equation xa inkqubo ivunyiwe ukusetyenziswa kwezorhwebo kunye nabasebenzisi. Ngenxa yoko, ukuphunyezwa kombala kwifomathi ye-NTSC ngowe-1953 bekusoloko kunobuthathaka kwenkqubo, ngoko i-NTSC yexesha iyaziwa ngabaqeqeshi abaninzi ngokuthi "Awuze Uphindwe kabini Umbala ofanayo". Ngaba uqaphele ukuba umgangatho wemibala kunye nokuvumelana kuyahlukahluka kakhulu phakathi kwezitishi?
Iimpawu ze-TV ze-Digital kunye noLuhlu oluvela kwi-Analog TV
Ngakolunye uhlangothi, i- TV yeDVD , okanye i- DTV , idluliselwa njengeenkcukacha zedatha, njengoko idatha yedatha ibhaliwe okanye indlela umculo okanye ividiyo ibhalwe kwiCD, iDVD, okanye i-Blu-ray Disc. Isignali yedijithali yenziwe i-1 kunye ne-0. Oku kuthetha ukuba uphawu oludluliselwayo "luya" okanye "luya". Ekubeni iimpawu zedijithali ziphelile, umgangatho wesignali awufani phakathi komda othile ohambelana nombane wokuthumela umbane.
Ngamanye amagama, injongo ye-teknoloji yokudlulisa i-DTV kukuba umbukeli ubona umfanekiso okanye akukho nto. Akukho ukulahleka kwesigxina sokumisa njengoko umgama ukusuka kumthumeli ukwandisa. Ukuba umbukeli usekude ukusuka kumthumeli okanye kwindawo engathandekiyo, akukho nto ebonayo.
Ngakolunye uhlangothi, ngokungafani ne-TV ye-analog, i-TV yedijithali yenzelwe ukusuka kumhlaba ukuya kuthatha yonke into ebalulekileyo yesikhangiso somabonwakude: Ingqwalasela yeB / W, umbala, kunye ne-audio kwaye ingadluliselwa njenge- interlaced (imigca ekhishwe ezinye iinkalo) okanye ukuqhubela phambili (imigca ekhishwe ngokulandelelana ngokulandelelana) . Ngenxa yoko, kukho intembeko enkulu kunye nokuguquguquka komxholo womqondiso.
Ukongezelela, ekubeni isalathisi se-DTV senziwe nge "bits", ubungakanani obufanayo bebhanwidth esithatha isalathisi se-analog ye-TV yangoku, ayikwazi ukungena kuphela umfanekiso ophezulu ophezulu kwifomathi, kodwa isithuba esingekho esasetyenzisiweyo kwisibonakaliso seTV inokusetyenziswa kwividiyo ezongezelelweyo, izandi, kunye nemiqondiso yombhalo.
Ngamanye amazwi, abasasazo banokunika iinkcukacha ezininzi, ezifana nezandi ezizungezile, izandi ezininzi zeelwimi, iinkonzo zeteksi, kunye nokunye kwisithuba esifanayo esiphethwe ngumqondiso we-analog. Nangona kunjalo, kukho enye inzuzo kwikhono lesiteshi se-Digital TV; ukukwazi ukuhambisa isignali ephezulu (HDTV) .
Ekugqibeleni, omnye uhluko phakathi kweDivil TV kunye ne-Analog TV yikhono lokusasaza kwiprogram yesibrari (16x9) yangempela . Ubume bomfanekiso ngokugqithiseleyo bufana nomfanekiso weskrini se-movie, okwenza umbukeli abone i-movie njengomenzi wefilimu. KwiMidlalo, unokufumana ngaphezulu kwezenzo kwikhamera enye, njengokuba ubukela ubude bebala lebhola ngaphandle kokubonakala ngathi lide elide kude nekhamera.
Umlinganiselo we-16x9 u-TV ungabonakalisa imifanekiso eqingqiweyo ngaphandle kwendawo enkulu yezithuba ezithatyathwa ngamabhola amnyama phezulu nangaphantsi kwesithombe esibomvu, oko kukubona ukuba imifanekiso enjalo iboniswa kwi-TV eqhelekileyo. Ngaphandle kwemithombo ye-HDTV, njengeDVD ingasebenzisa ngokunxulumene ne-TV ye-19x9.
Ukususela kwi-DTV ukuya kwi-HDTV nangaphezulu ...
Enye into ebangel 'umdla ukubonisa ukuba utshintsho oluvela kwi-Analog ukuya kwi-Digital TV luyodwa inyathelo. Nangona zonke i-HDTV ziyi-Digital TVS, akuzona zonke iifrikansi zeDVD zeHD, kwaye akuzona zonke i-TV ze-TV ezi-HDTV. Ukufumana okungakumbi ngale miba, kunye ne-4K, kunye ne-8K, izinto ezixutywe kumxube, jonga amanqaku athile alandelayo apha: