Kusankha ma TV omwe akufalitsidwa
Kukhazikitsidwa kwa ma DTV ndi HDTV kulengeza kudzera mu DTV Transition yomwe inachitika mwadzidzidzi pa June 12, 2009, inali yochitika mbiri yakale, chifukwa inasintha momwe TV ikugwiritsidwira ntchito ndi kupeza ogula ku US Komabe, pali chisokonezo monga zomwe DTV ndi HDTV zimatchulidwa.
Mauthenga onse a HDTV ndi digito, koma sikuti onse akuwonetsera TV ndi HDTV. Mwa kuyankhula kwina, bandwidth yomweyo yomwe imayikidwa pajambulutsi ya pa TV ingagwiritsidwe ntchito kupereka kanema kanema (kapena angapo) ndi zina, kapena ingagwiritsidwe ntchito kutumiza chizindikiro chimodzi cha HDTV.
Ngakhale kuti pali njira 18 zosinthika zomwe zimapezeka pa TV, yomwe ikuvomerezedwa ndi Advanced Standards Television Komiti (ATSC) , ndi onse opanga TV pa TV amayenera kukonza mafomu onse 18, kugwiritsa ntchito DTV kulumikiza kwasintha 3 mawonekedwe: 480p, 720p, ndi 1080i.
480p
Ngati muli ndi sewero la DVD lopititsa patsogolo komanso TV , mumadziwika ndi 480p (mizere 480 yothetsera, kuyesedwa pang'onopang'ono). 480p ali ofanana ndi chiganizo chomwecho cha TV ya analog koma imafalitsidwa ndi chiwerengero (DTV). Amatchulidwa kuti SDTV (Standard Definition Television), koma chithunzicho chimayesedwa pang'onopang'ono, osati m'madera ena monga kufalitsa TV ya analog.
480p imapereka chithunzithunzi chabwino (makamaka pazing'ono zing'onozing'ono 19-29 "zojambula)." Zambiri zowonjezera mafilimu kusiyana ndi kawuni yapamwamba kapena ngakhale ma DVD omwe amachokera, koma amapereka theka la chithunzi cha kanema wa HDTV. imatayika pazithunzi zazikulu (mwachitsanzo, ma TV omwe ali ndi masentimita masentimita 32 ndi apo).
Komabe, ngakhale 480p ndi gawo lachithandizo chovomerezeka cha DTV, si HDTV. Mndandanda umenewu unaphatikizidwa kuti ndi imodzi mwa ma DVV owonetsera ma TV kuti opatsa mauthenga awonetsere njira zoperekera ma pulogalamu yofanana ndi chizindikiro chimodzi cha HDTV. Mwa kuyankhula kwina, 480p ndi zambiri zomwe mungathe kuziwona mu chizindikiro cha TV ya analog, ndi kuwonjezeka pang'ono kwa khalidwe la zithunzi.
720p
720p (mizere 720 yothetsera kusinthidwa pang'onopang'ono) imakhalanso mafilimu a TV, koma imatengedwa kuti ndi imodzi mwa mawonekedwe a HDTV.
Zowonjezera, ABC ndi FOX amagwiritsa ntchito 720p monga miyezo yawo yofalitsira HDTV. Sikuti 720p imapereka chithunzi chosaoneka bwino, chofanana ndi mafilimu chifukwa cha kupititsa patsogolo kwake kwapangidwe, koma tsatanetsatane wa zithunzi ndi 30% yolimba kuposa 480p. Zotsatira zake, 720p amapereka chithunzithunzi chovomerezeka cha zithunzi chomwe chikuwoneka pazithunzi zozungulira (32 "- 39") komanso masewera akuluakulu. Ndiponso, ngakhale 720p imaonedwa kuti ndi yotchuka kwambiri, imatenga kuchepa kwapakati kuposa 1080i , yomwe imayikidwa patsogolo.
1080i
1080i (mizere 1,080 ya chisankho yomwe imasankhidwa m'madera ena omwe ali ndi mizere 540 iliyonse) ndiyo njira yomwe amagwiritsidwa ntchito kwambiri ku HDTV yomwe imagwiritsidwa ntchito pa TV. Fomuyi yavomerezedwa ndi PBS, NBC, CBS, ndi CW (kuphatikizapo satellite programmers HDNet, TNT, Showtime, HBO, ndi zina ntchito malipiro) monga HDTV awo ma TV. Ngakhale pakadakalibe mkangano wosonyeza kuti ndi bwino kwambiri kusiyana ndi 720p poona momwe akuonera, 1080i amapereka chithunzi chokwanira pa ma 18 onse ovomerezeka a DTV. Pa mbali imodzi, maonekedwe a 1080i amatayika pazithunzi zazing'ono (pansi pa 32 ").
Komabe, zovuta za 1080i ndi izi:
- 1080i amatenga mawonekedwe ambiri a mawonekedwe onse a DTV.
- 1080i ndijambulo lokhala ndi mapulogalamu, zomwe zikutanthauza kuti chithunzi chowonetsedwa chimapangidwa ndi mizera kapena mizere ya pixel yomwe imawerengedwa / kusonyezedwa m'malo mwake pang'onopang'ono monga mu 480p ndi 720p.
- 1080i sangathe kuwonetsedwa m'mawonekedwe ake pa LCD, OLED, Plasma, kapena DLP TV . Kuti muwonetse zithunzi zomwe zimafalitsidwa mu 1080i, mitundu ija ya maselo ayenera kusintha chizindikiro cha 1080i ku 720p kapena 1080p kuti muwonetse chithunzi pawonekedwe la TV.
Mwa kuyankhula kwina, ngati muli ndi LCD 1080p kapena OLED TV, (kapena muli ndi Plasma kapena DLP TV) idzatulutsa chizindikiro cha 1080i ndikuchiwonetsera ngati chithunzi cha 1080p . Njirayi, ngati itachita bwino, imachotsa mizere yonse yowunikira yomwe imapezeka mkati mwa chithunzi cha 1080i, chomwe chimapangitsa kuti m'mbali mwabwino kwambiri. Mwachizindikiro chomwecho, ngati muli ndi 720p HDTV, TV yanu idzachotsa pansi ndi kujambula chithunzi cha 1080i ku 720p kuti muwonetseredwe.
Nanga bwanji 1080p?
Ngakhale kuti 1080p imagwiritsidwa ntchito pa Blu-ray, Cable, ndi kusakanikirana kwa intaneti, siigwiritsidwe ntchito pawotchi pa TV. Chifukwa cha ichi ndikuti pamene ma TV omwe amawonekera pa TV akuvomerezedwa, 1080p sanali mbali ya equation. Zotsatira zake ndi ma TV opanga ma TV osatulutsa zizindikiro za TV mu ndondomeko ya 1080p.
Zambiri Zobwera - 4K ndi 8K
Ngakhale kufalitsa kwa DTV ndiyomwe ilipo panopa, musasangalale pakalipano, monga maulendo otsatirawa akuyembekezeredwa kuphatikizapo chisankho cha 4K , ndipo, kupitilira pamsewu, 8K .
Poyambirira, zinkaganiziridwa kuti ziwonetsedwe zowonongeka kwa 4K ndi 8K sizingatheke chifukwa cha zofunikira zazikulu zamagulu. Komabe, pali kuyesedwa kobwerezabwereza komwe kwatithandiza kukhala oyenerera kulumikizana ndizowonjezera zonse zomwe zikuwonjezeka mkati mwa zipangizo zamakono zowonetsera zamagetsi pogwiritsa ntchito matekinoloje owonetseratu mavidiyo omwe amasungidwa ndi zotsatira zapamwamba zofunikira pawonetsedwe ka TV. Chotsatira chake, pali khama lalikulu lokhazikitsa chisankho cha 4K pa televizioni kudzera mu kukhazikitsidwa kwa ATSC 3.0 .
Pamene mapulogalamu a pa TV amapanga zipangizo zofunikira ndi maulendo opatsirana, ndipo opanga TV akuyamba kuphatikiza ojambula a ATSC ku ma TV ndi masakonzedwe apamwamba-apamwamba, ogula adzatha kulandira ma TV 4K, koma mosiyana ndi tsiku lovuta lomwe likufunika kusintha Kuchokera ku analog kupita ku digito / HDTV kulengeza, kusintha kwa 4K kudzakhala pang'onopang'ono ndipo pakadali pano mwadzidzidzi.
Kukhazikitsidwa kwa ma TV 4K kumatsutsana ndi njira zina zopezera zokhudzana ndi 4K, monga kudzera pa intaneti, kuphatikizapo Netflix ndi Vudu , komanso kudzera mu mafilimu a Ultra HD Blu-ray . Ndiponso, DirecTV imaperekanso chakudya cha satellite 4K chochepa .
Pakadali pano, ngakhale kuyesayesa kwakukulu ndiko kubweretsa ma TV 4K, Japan ikulimbikitsanso ndi mafilimu 8K Super Hi-Vision TV Broadcasting yomwe imaphatikizapo ma audio 22.2. Super Hi-Vision yakhala ikuyesedwa kwa zaka khumi ndipo ikuyembekezeka kukhala yokonzeka mokwanira polemba ntchito 2020, potsatira chivomerezo chomaliza.
Komabe, pamene ma TV 8K angapezeke pafupipafupi ndiyomwe akuganiza, monga mu 2020, ma TV 4K sadzakwaniritsidwanso - kotero kupanga wina kudumpha ku 8K mwina kukhala zaka khumi kutali, makamaka pakuganizira kuti opanga TV amakhala Tapanga ma TV 8K kapena zomwe zilipo kwa ogula - ngakhale ngakhale pofika 2020, ma TV ngati amenewa adzakhala ochepa. Inde, pakufunika 8K zokwanira kuwonerera - owonetsera TV amafunika kupanga zipangizo zina zamakono.