Bayyana fitar da gidan talabijin na Digital TV
Tsarin watsa shirye-shirye na DTV da HDTV ta hanyar DTV Transition wanda ya faru a ranar 12 ga Yuni, 2009, babban tarihin tarihi ne, saboda ya canza hanyar da aka watsa shirye-shiryen TV da kuma samun dama ga masu amfani da Amurka. Duk da haka, akwai rikicewa game da abin da sharudda DTV da HDTV ke nufi.
Duk shirye-shirye na HDTV ne dijital, amma ba duka watsa shirye-shiryen talabijin na Digital TV ba ne HDTV. A wasu kalmomi, irin wannan ladabi don watsa shirye-shiryen talabijin na dijital na iya amfani dasu don samar da sigina na bidiyo (ko dama) da sauran ayyuka, ko za a iya amfani dashi don watsa wata alama ta HDTV.
Kodayake akwai samfuran tsare-tsaren daban-daban na 18 da aka samo don watsa shirye-shiryen talabijin na dijital, wanda aka amince da Kwamitin Gidan Telebijin na Advanced Standards (ATSC) , da kuma dukkan na'urorin Tsarabijin na Intanit ana buƙatar lalata dukkanin samfurori 18, aikace-aikacen amfani da DTV watsa shirye-shirye ya sauko zuwa ƙuduri 3 Formats: 480p, 720p, da 1080i.
480p
Idan kana da lasisin DVD da TV , sai ka san da 480p (480 Lines na ƙuduri, an duba su a hankali). 480p yayi kama da wannan ƙudurin tashar TV ɗin analog analog amma ana daukar kwayar cutar ta atomatik (DTV). An kira shi SDTV (Standard Definition Television), amma an gwada hotunan gaba daya, maimakon a wasu wurare dabam dabam kamar yadda yake a tashoshin analog TV.
480p yana samar da kyakkyawan hoto (musamman a kananan karamin 19-29). Yana da mafi yawan fina-finai fiye da nagarta na USB ko ma kwarewar DVD mai kyau, amma kawai yana ba da rabin damar bidiyo na hoto na HDTV, sabili da haka tasirinta ya ɓace akan manyan allo (alal misali, TVs da girman allo 32 inci da sama).
Duk da haka, ko da yake 480p yana cikin ɓangaren watsa shirye-shiryen watsa labarai na DTV, ba HDTV ba ne. Wannan daidaitattun ya ƙunshi a matsayin ɗaya daga cikin tsarin watsa shirye-shiryen watsa labarai na DTV don samar da masu watsa shirye-shirye zaɓi na samar da hanyoyi masu yawa na shirye-shiryen a cikin wannan bandwidth a matsayin alama guda ɗaya na HDTV. A wasu kalmomi, 480p ne kawai mafi yawan abin da za ku gani a cikin alamar TV ɗin analog, tare da ƙaramin ƙãra a cikin hoto.
720p
720p (720 layi na ƙuduri da aka gwada da hankali) yana da tsarin talabijin na dijital, amma an kuma dauke shi a matsayin daya daga cikin kamfanonin watsa shirye-shiryen HDTV.
Kamar yadda irin wannan, ABC da FOX amfani da 720p a matsayin tsarin watsa labarai na HDTV. Ba wai kawai zancen 720p yana samar da santsi mai kama da hoto ba saboda yadda aka aiwatar da shi sosai, amma adadin hotunan yana da akalla 30% fiye da 480p. A sakamakon haka, 720p bayar da wani karɓaccen image haɓaka wanda yake bayyane a kan duka matsakaici (32 "- 39") girman fuska da kuma manyan allon fuska. Har ila yau, ko da yake 720p ana dauke da babban ma'anar, yana ɗaukar ƙaramin bandwidth fiye da 1080i , wanda aka rufe gaba.
1080i
1080i (ƙananan ƙa'idodin 1,080 da aka gwada a wasu wurare dabam dabam da suka kunshi sassan 540 kowannensu) shine mafi yawan amfani da HDTV da aka yi amfani dashi don watsa shirye-shiryen telebijin na iska. Wannan tsarin ya karbe shi ta hanyar PBS, NBC, CBS, da kuma CW (da masu shirye-shiryen tauraron dan adam HDNet, TNT, Showtime, HBO, da kuma wasu ayyukan biya) a matsayin tsarin watsa shirye-shirye na HDTV. Kodayake har yanzu muna da muhawara akan ko yana da kyau fiye da 720p a ainihin tunanin mai kallo, ta hanyar fasaha, 1080i tana samar da cikakkun hoto game da dukkanin ka'idodi na DTV da aka yarda da su. A gefe guda, tasiri na 1080i ya ɓace a kan karamin allo (a kasa 32 ").
Duk da haka, zane-zane na 1080i sune:
- 1080i tana ɗaukar mafi yawan bandwidth na dukan tsarin watsa labarai na DTV.
- 1080i alamacciyar alama ce, wanda ke nufin cewa hoton da aka nuna shi ne samfurori ko jerin pixel wanda aka lakabi / nunawa a madadin maimakon a cikin 480p da 720p.
- 1080i ba za a iya nuna shi a siffarsa ta hanyar LCD, OLED, Plasma, ko DLP TV ba . Domin nuna hotuna da aka aika a cikin 1080i, waɗannan nau'ikan iri sun buƙaci mayar da alamar 1080i zuwa 720p ko 1080p don nuna hoton a kan allon TV.
A wasu kalmomi, idan kana da LCD 1080p ko OLED TV, (ko kuma har yanzu yana da Plasma ko DLP TV) zai kawar da alamar 1080i kuma nuna shi a matsayin hoton 1080p . Wannan tsari, idan aka yi da kyau, ta kawar da kowane layin layin da aka gani a cikin hoto 1080i, wanda ya haifar da gefuna sosai. Ta wannan alama, idan kana da 720p HDTV, TV ɗinka zai sake yin amfani da shi kuma ya sauko da siffar 1080i zuwa 720p don nuna allo.
Menene Game da 1080p?
Kodayake ana amfani da 1080p na Blu-ray, Cable, da kuma Intanit, ba a yi amfani dashi a watsa shirye-shirye na kan-iska ba. Dalilin haka shi ne cewa lokacin da aka yarda da matakan watsa shirye-shiryen talabijin na Digital TV, 1080p ba sa cikin ɓangaren. A sakamakon haka, masu watsa shirye-shirye na TV ba su aika da siginonin TV a kan-da-air a cikin matakan 1080p.
Ƙarin Zama - 4K da 8K
Kodayake watsa shirye-shiryen DTV shine daidaitattun halin yanzu, kada ku kwantar da hankali har yanzu, kamar yadda za a yi la'akari da zagaye na gaba na ka'idojin 4K , kuma, ƙara zuwa hanya, 8K .
Da farko, an yi tunanin watsa shirye-shiryen 4K da 8K a kan-iska ba zai yiwu ba saboda bukatun babbar bandwidth. Duk da haka, akwai gwajin da ke gudana wanda ya haifar da damar da za ta dace da duk ƙarin bayani a cikin fasahar watsa labarai na yau da kullum ta hanyar amfani da fasaha mai mahimmanci na bidiyo da ke riƙe da kyakkyawan sakamako da ake bukata a ƙarshen tashar TV. A sakamakon haka, akwai babban ƙoƙarin aiwatar da 4K ƙuduri a watsa shirye-shiryen talabijin ta hanyar aiwatar da ATSC 3.0 .
Kamar yadda gidajen talabijin na samar da kayan aiki da kayan haɓaka, da masu watsa shirye-shiryen gidan talabijin sun fara shigar da masu sauraron ATSC zuwa cikin TV da kuma akwatunan saiti, masu amfani zasu iya samun dama zuwa 4K TV, amma, ba kamar lokacin da aka buƙata don miƙa mulki ba. daga analog zuwa dijital / HDTV watsa shirye-shiryen watsa shirye-shiryen, sauyawa zuwa 4K zai yi jinkiri kuma a halin yanzu yana son rai.
Tsarin watsa shirye-shirye na 4K yana da shakka a kan wasu hanyoyi na samun damar abun ciki na 4K, irin su ta hanyar intanet, kamar Netflix da Vudu , da kuma ta hanyar tsarin Ultra HD na Blu-ray Disc . Har ila yau, DirecTV yana bada kyauta na tauraron dan adam 4K .
A halin yanzu, kodayake babban ƙoƙari shi ne samar da watsa shirye-shiryenta 4K zuwa gidan talabijin, Japan kuma tana turawa gaba tare da tsarin Super Broadcast Broadcasting na 8K na SuperK 8K wanda ya hada da har zuwa 22.2 tashar tashoshin. Super Hi-Vision ya kasance cikin gwajin domin fiye da shekaru goma kuma an sa ran ya kasance cikakke don yin amfani da ita ta hanyar 2020, yayin da ya amince da amincewar karshe.
Duk da haka, lokacin da shirye-shiryen talabijin na 8K za'a samuwa a kan duniyar mahimmanci wani abu ne, kamar yadda a cikin 2020, 4K TV watsa shirye-shirye har yanzu ba za'a cika shi ba - don haka wani ya tashi zuwa 8K zai yiwu ya zama shekaru goma, musamman lokacin da la'akari da masu yin gidan TV. 't sanya 8K TV ko abun ciki samuwa ga masu amfani duk da haka - har ma da 2020, irin wannan TV za su karami a cikin lambar. Tabbas, akwai bukatar 8K abun ciki don kallon - masu watsa labaran TV zasu bukaci yin wasu kayan aiki na musamman.