Qhov twg lub qhov muag raws li qhov screen ...
Thaum koj mus kav khw TV, Blu-Ray Disc player, DVD player, los yog camcorder, tus neeg muag khoom yeej ib txwm pom zoo rau lub sij hawm daws teeb meem . Nws yog cov kab no thiab pixels uas yog li ntawd ... Tom qab ib ntus, tsis muaj leej twg zoo li ua rau kev nkag siab. Nov yog yam koj yuav tsum paub.
Lub Yees Duab Siab Zoo Li Cas
Tus duab video yog ua los ntawm cov kab sib txuas (cov duab video / playback thiab TVs) lossis pixels (cov ntaubntawv povthawj siv / playback thiab LCD, Plasma, OLED TVs ). Tus naj npawb ntawm cov kab scan los yog pixels txiav txim siab txog cov lus kaw tseg lossis pom zoo.
Tsis zoo li zaj duab xis, nyob rau hauv uas tag nrho cov duab tso tawm kom pom ntawm ib qho screen ib zaug, video dluab yog tso tawm txawv.
Cov Yees Duab Luam Yeeb Npaum Li Cas
Tus duab TV yog tsim los ntawm cov kab lossis pixel kab ntawm lub vijtsam pib rau saum qhov screen thiab tsiv mus rau hauv qab. Cov kab no los yog cov kab yuav pom ob txoj hauv kev.
- Thawj txoj kev uas pom tau cov duab pom tau los ntawm kev faib ua kab rau hauv ob thaj chaw uas txhua tus khij kab zauv tau tso tawm thawj zaug thiab ces tag nrho cov kab xij tooj-npo kuj tau muab tso tawm los sib txuas los yog interlaced scan .
- Qhov thib ob hom, uas yog siv nyob rau hauv digital video cheeb tsam, yog kev luam scan . Tsis txhob tso saib cov kab hauv ob lub tshav ua lwm yam, kev ua luam kom loj hlob tso cai rau cov kab kom pom tias yuav tshwm sim. Qhov no txhais tau hais tias ob qhov khib nyiab thiab tus lej txawm muaj cov kab nyob rau hauv cov zauv.
CRT TVs (TVs uas siv duab tubes) tuaj yeem ua kom pom cov duab sib txuas lossis cov teeb meem tau tshwm sim, tab sis kev sib tw hauv TV (LCD, Plasma, OLED) tsuas yog tso saib cov duab ua tau zoo - thaum ntsib nrog cov teeb liab duab interlaced, TV yuav rov qab ua cov ntaub ntawv yees duab sib txuas ua ke kom nws tuaj yeem muab tso tawm kom pom.
Analog yees duab - Lub Pib Pib
Thaum nws tuaj cuag peb li cas peb saib cov yees duab daws teeb meem, analog video yog qhov pib taw tes. Txawm hais tias feem ntau ntawm peb saib hauv TV yog los ntawm digital sources, qee qhov analog qhov chaw thiab TVs tseem siv.
Nyob rau hauv analog video, qhov loj dua tus naj npawb ntawm txoj kab ntsuas ntsig, qhov ntxaws ntxiv cov duab. Txawm li cas los xij, tus lej ntawm txoj kab ntawm txoj kab sib ntsug yog kho nyob rau hauv lub cev. Ntawm no yog saib zoo li cas kev daws teeb meem ua haujlwm hauv NTSC, PAL, thiab SECAM analog video systems.
- NTSC yog nce raws 525-kab, 60 thaj tsam / 30 thav-ib-thib ob, ntawm 60Hz rau kev sib kis thiab tso duab video. Qhov no yog ib qho kev sib txuas ntawm txhua qhov thaij hauv ob lub tshav dav hlau ntawm 262 kab, uas yog ces muab tso kom pom cov duab thaij duab nrog 525 kab sib txuas kab. Lub teb chaws NTSC-raws li US, Canada, Mexico, qee feem ntawm Central thiab South America, Nyiv, Taiwan, thiab Kauslim teb.
- PAL uas yog hom siv ntau tshaj plaws nyob rau lwm lub teb chaws NTSC rau kev tshaj tawm hauv TV thiab duab yeeb yaj kiab, yog raws li kab 625, 50 teb / 25 thav ob, 50 HZ. Cov teeb liab yog interlaced, xws li NTSC mus rau ob thaj teb, muaj li ntawm 312 kab txhua qhov.Qhov qhov txawv ntawm PAL yog ib qho zoo dua tag nrho daim duab dua NTSC vim yog qhov nce ntxiv ntawm cov kab scan, thiab vim qhov xim yog ib feem ntawm tus qauv pib , lub teb chaws uas siv cov PAL muaj xws li UK, Lub teb chaws Yelemees, Spain, Portugal, Ltalis, Tuam Tshoj, Is Nrias teb, feem ntau ntawm cov teb chaws Africa, thiab Middle East.
- SECAM yog lub "outlaw" ntawm cov qauv siv video analog. Zoo li PAL, nws yog 625 kab, 50 tshav dav hlau / 25 thav plaub ntawm ib qho kev sib txuas lus thib ob, tiam sis xim tshwj xeeb yog siv ntau tshaj li ntawm PAL los yog NTSC. Lub teb chaws uas tau siv lub SECAM system muaj xws li Fabkis, Russia, Eastern Europe, thiab qee qhov chaw hauv Middle East.
Tus naj npawb ntawm cov kab scan, los yog txoj kev daws teeb meem , ntawm NTSC / PAL / SECAM, yog qhov tas nrho cov ntaub ntawv teev yees duab thiab cov khoom tso duab analog raws li cov qauv saum toj no. Txawm li cas los xij, ntxiv rau ntawm qhov ntsuas kab ntsig, qhov dots tso tawm kom pom nyob rau hauv txhua kab ntawm lub vijtsam muaj txiaj ntsig rau qhov kev sib tw uas yog qhov kev daws teeb meem uas yuav sib txawv raws li ob qhov kev muaj peev xwm ntawm video txias / playback ntaus los sau cov dots and ability ntawm ib qho video saib kom pom cov dots ntawm ib qho screen.
Kev siv NTSC ua piv txwv, muaj 525 kab sib txuas (kev daws teeb meem) tag nrho, tiam sis tsuas yog 485 luam kab sib luag siv los txheeb xyuas cov ncauj lus dav dav hauv cov duab (cov kab ntxiv yog encoded nrog lwm cov ntaub ntawv, xws li kaw captioning thiab lwm yam ntaub ntawv xov xwm ). Feem ntau cov analog TV nrog tsawg AV nkag tau tuaj yeem tso tawm txog 450 kab kev daws teeb meem, nrog ntau dua-kev ntsuas saib muaj peev xwm ntau dua.
Cov nram qab no yog ib daim ntawv teev cov kev yees duab analog thiab lawv txoj kev kwv yees txog xwm txheej daws teeb meem. Qee qhov kev txawv txav yog vim muaj ntau hom khoom sib txawv thiab cov qauv ntawm cov khoom siv txhua hom.
- VHS / VHS-C - 220 txog 240 kab
- BETA - 250 kab
- 8 hli - 250 txog 280 kab
- SuperBETA - 270 mus rau 280 kab
- Analog TV tshaj tawm - 330 kab
- Analog Cable TV - 330 kab
- Txuj Digital Cable - Mus txog 480 kab (axle 480i) ntawm cov zis analog video. 720 x 480 pixels (480i lossis 480p) ntawm HDMI (digital) cov zis video.
- S-VHS / S-VHSC - 400 kab
- DVD-R / -RW / + R / + RW - 250 mus rau 400+ kab (Nyob ntawm cov ntaubntawv povthawj siv hom thiab kev txuam siv).
- Laserdisc - 400 mus rau 425 kab
- Hi8 - 380 mus rau 440 kab
- Cov lej 8 - 400 txog 500 kab
- miniDV - 400 mus rau 520 kab
- microMV - 500 kab
- ED BETA - 500 kab
- Commercial DVD - 480 kab (aka 480i) ntawm kev tso tawm video analog. 720 x 480 pixels (480i lossis 480p) ntawm HDMI (digital) cov zis video.
Raws li koj tau pom, muaj ntau qhov sib txawv ntawm qhov daws teeb meem uas sib txawv video tawm tswv yim. VHS yog nyob rau hauv qab kawg, thaum miniDV thiab DVD (thaum siv cov lus tso tawm hauv analog) sawv cev rau ntau tshaj plaws analog yees duab duab uas siv ntau zaus.
Txawm li cas los xij, lwm yam tseem ceeb uas yuav tsum tau muab xam yog li cas qhov kev txiav txim siab tau teev tseg rau Digital thiab HDTV.
Xwb raws li nyob rau hauv analog yees duab yog ob qho tib si ib feem ntsug thiab kab rov tav rau digital video daws teeb meem. Txawm li cas los, tag nrho cov duab daws teeb meem hauv DTV thiab HDTV raug xa mus rau hauv cov ntsiab lus ntawm cov pixels ntawm qhov screen es tsis ua kab. Txhua pixel muaj li ntawm cov xim liab, ntsuab, thiab xiav.
Cov Qauv Digital Daws Teeb Seem
Hauv cov qauv digital TV tam sim no, muaj tag nrho cov duab 18 video formats uas tau pom zoo los ntawm FCC rau kev siv hauv Teb Chaws Asmeskas TV broadcast system (tseem siv ntau cable / satellite tshwj xeeb). Muaj hmoo, rau tus neeg siv khoom, tsuas muaj peb qho uas feem ntau siv TV broadcasters, tiam sis tag nrho cov HDTV tuners muaj tshaj li 18 hom ntawv.
Cov qauv peb siv hauv digital thiab HDTV yog:
- 480p - Sawv cev los ntawm 720 pixels khiav hla lub vijtsam thiab 480 pixels khiav ntawm sab saum toj mus rau hauv qab. Txhua kab ntawm pixels muab tso tawm kom pom. Tag nrho cov pixels tshwm ntawm qhov screen yog 345,600.
- 720p - Sawv cev los ntawm 1280 pixels khiav thoob plaws kev tshuaj ntsuam thiab 720 pixels khiav los ntawm sab saum toj mus rau hauv qab. Txhua kab ntawm pixels muab tso tawm kom pom. Tag nrho cov pixels tshwm ntawm qhov screen yog 921,600.
- 1080i - Sawv cev los ntawm 1,920 pixels khiav hla lub vijtsam thiab 1,080 pixels khiav saum toj mus rau hauv qab. Txhua kab hauv pixels tau tshwm sim nyob rau hauv ib qho kev sib tshuam hauv kev sib txuas (tag nrho khib naj npawb, tom qab los ntawm tag nrho cov kab txawm tias cov lej). Tag nrho cov pixels uas tau tso tawm ntawm qhov screen yog 2,073,600 (ib nrab ntawm cov pixels tso tawm kom pom ib zaug).
1080p
Txawm hais tias tsis siv TV broadcasting (mus txog rau qhov no), Blu-duab tshav tawm tswv yim , streaming , thiab qee qhov cable / satellite cov kev pab cuam tau xa cov ntsiab lus hauv 1080p daws teeb meem
1080p nruab nrab yog 1,920 pixels khiav ntawm lub vijtsam, thiab 1,080 pixels khiav saum toj mus rau nram qab kawg, Ib kab toj pixel kab yog tso kom pom. Qhov no txhais tau hais tias tag nrho 2,073,600 pixels muab tso rau hauv ib tes hauj lwm. Qhov no zoo ib yam li cas 720p yog tso tawm tiam sis nrog ib tus zauv ntawm pixels hla thiab nqes qhov kev tshuaj ntsuam, thiab txawm hais tias qhov kev daws teeb meem yog tib yam li 1080i, tsis yog tag nrho cov pixels tshwm nyob rau tib lub sijhawm .
HDTV vs EDTV
Txawm hais tias koj tuaj yeem tsim duab txog qee qhov kev daws teeb meem hauv koj lub HDTV, koj lub TV yuav tsis muaj peev xwm los tsim tau txhua yam ntaub ntawv. Hauv qhov no, lub teeb liab feem ntau yog muab ua dua (scaled) kom haum raws li tus naj npawb thiab qhov loj ntawm pixels ntawm lub vijtsev.
Piv txwv li, duab nrog lub daws teeb meem ntawm 1920 x 1080 pixels yuav scaled kom haum haum 1366 x 76, 1280 x 720, 1024x768, 852x480, los yog lwm muaj pixel teb rau lub TV ua qhov ua tau. Qhov txheeb ze ntawm kev nthuav dav ntawm tus neeg saib xyuas yuav yog nyob ntawm seb yam loj li cas thiab pom kev nrug ntawm qhov screen.
Thaum nriav lub TV, nws tseem tsis tau yog qhov tseem ceeb kom paub tseeb tias koj tuaj yeem nkag siab txog 480p, 720p, 1080i, lossis lwm yam kev yees duab uas koj xav tau, tab sis koj yuav tsum xav txog lub tshav pixel ntawm lub TV (thiab seb upconversion / downconversion yog siv).
Yuav kom nkag mus ntxiv, lub TV uas muaj qhov teeb meem ntawm HDTV (xws li 720p, 1080i, lossis 1080p) mus rau pixel teb ntawm 852 x 480 (480p) piv txwv, raug xa mus rau EDTVs thiab tsis HDTVs. EDTV sawv cev rau Cov Lus Txhais Lus Txhais Zoo.
Daws Qhov Yuav Tsum Tau Muaj Tseeb Duab Duab Duab
Yog hais tias lub TV muaj ib qho qauv daws teeb meem ntawm yam tsawg 720p, nws tsim nyog ua HDTV. Feem ntau cov LCD thiab Plasma TVs siv, piv txwv li, muaj ib qho kev tso saib daws teeb meem ntawm 1080p (Full HD) . Yog li, thaum ntsib nrog 480i / p, 720p, los yog 1080i input teeb liab, lub TV yuav teev lub teeb liab rau 1080p kom tso nws rau ntawm qhov screen.
Upscaling thiab DVD
Txawm hais tias tus txheem DVD tsis yog hom ntawv daws teeb meem, feem coob ntawm cov DVD players muaj peev xwm tawm tau cov teebmeem video hauv 720p, 1080i, lossis 1080p ntawm kev nce ubno . Qhov no tso cai rau cov neeg uas ua DVD ntawv cov video tso tawm kom zoo dua cov kev ua haujlwm ntawm ib qho HDTV, nrog rau ntau yam duab. Txawm li cas los xij, nco ntsoov hais tias qhov tshwm sim ntawm kev tshaj tawm tsis zoo tib yam li cov neeg 720p, 1080i, lossis 1080p daws teeb meem, nws yog ib qho kev ua zauv.
Video upscaling ua haujlwm zoo tshaj plaws rau cov duab pixel taag, xws li cov LCD los yog Plasma poob lawm, lub upscaling yuav ua rau cov dluab hnyav ntawm kab scanned raws li CRT thiab CRT raws li cov nyiaj poob haujlwm.
Tshaj 1080p
Txog xyoo 2012 1080p video daws teeb meem tau siab tshaj plaws rau kev siv hauv TVs, thiab tseem xa tau zoo tshaj plaws rau cov saib TV ntau. Txawm li cas los xij, nrog rau qhov kev thov kom pom ntau qhov loj npaum li cas, 4K Resolution (3480 x 2160 pixels los yog 2160p) tau muab coj los ua ib tus duab meej meej, tshwj xeeb tshaj yog nrog lwm cov technologies, xws li HDR ci li thiab WCG ). Kuj, raws li upscaling yog siv los ua kom pom pom meej rau qhov kev daws teeb meem ntawm HDTVs, ib 4K Ultra HD TV ua haujlwm tau zoo tshaj plaws rau cov teeb liab kom nws zoo zoo dua ntawm nws qhov screen.
4K tam sim no muaj nyob ntawm Ultra HD Blu-Ray Disc thiab xaiv cov kev pab cuam streaming, xws li Netflix , Vudu , thiab Amazon.
Ntawm chav kawm, ib yam li lab tus neeg tau txais kev pab siv mus rau 4K Ultra HD TVs, 8K Resolution (7840 x 4320 pixels - 4320p) yog rau txoj kev.
Resolution thiab Screen Dimension
Ib qho uas yuav tsum tau saib xyuas yog tias cov digital thiab HD tiaj tus vaj huam sib luag TVs cov pixels rau ib qho kev daws teeb meem tsis hloov raws li qhov kev tshuaj ntsuam me me hloov. Hauv lwm lo lus, muaj 32-nti 1080p TV muaj tib pixels ntawm qhov screen li 55-nti 1080p TV. Muaj ib txwm muaj 1,920 pixels khiav ntawm lub vijtsam horizontally, ib kab, thiab 1,080 pixels khiav nce thiab nce qhov screen vertically, ib kem. Qhov no txhais tau hais tias cov pixels ntawm 1080p 55-inch TV yuav loj dua cov pixels ntawm lub 32-nti 1080p TV kom puv npo. Qhov no txhais tau hais tias raws li qhov kev ntsuam xyuas me me hloov, pes tsawg tus pixels ib nti hloov.
Lub Kab Hauv Qab
Yog tias koj tseem tsis meej pem txog kev daws teebmeem video, koj tsis nyob ib leeg. Nco ntsoov, kev yees duab daws tau teeb meem hauv kab los yog pixels thiab cov kab los yog pixels txiav txim qhov daws teeb meem ntawm qhov chaw los yog TV. Txawm li cas los xij, tsis txhob ntes tau rau hauv tag nrho cov kev daws teeb meem video. Saib nws ua li no, VHS zoo li ntawm 13-inch TV, tab sis "crappy" ntawm lub vijtsam loj.
Ntxiv mus, qhov kev daws teebmeem tsis yog qhov tsuas yog qhov uas muaj txiaj ntsig rau cov duab zoo hauv TV. Lwm yam tseem ceeb, xws li cov xim xim thiab qhov peb pom cov xim , qhov sib txawv ntawm qhov sib txawv, qhov ci ci ci, qhov siab tshaj plaws, saib duab yog interlaced los yog hnyav, thiab chav teeb pom kev zoo ua txhua yam tuaj yeem pab txhawb cov duab uas koj pom ntawm qhov screen.
Koj tuaj yeem muaj cov duab ntxim siab heev, tab sis yog hais tias lwm yam uas tau hais los tsis ua kom tiav, koj muaj lub TV ntxim nyiam. Txawm nrog cov yees, xws li kev tshaj tawm, cov TV zoo tshaj yuav ua tsis tau cov lus qhia tsis zoo uas zoo. Nyob rau hauv qhov tseeb, kev tshaj tawm TV thiab analog video sources (nrog rau lawv cov kev daws teeb meem) qee zaum zoo dua rau ntawm HDTV tshaj qhov nws ua rau ib qho zoo, tus txheej txheem, tus qauv analog.