Iyo Digital Digital uye HDTV Zvakabatanidzwa neAnalog Television Mitemo
Vakataridzi vakawanda veTV pasi pose vanofungidzira kuti nekutaura uye kugamuchirwa kweDhidhi TV neHDTV, zvipingamupinyi zvekare zveyero revhidhiyo zvakabviswa. Zvisinei, iyi inofungidzira zvisina kururama. Pasinei nokuti iyo vhidhiyo yava kunyanya kudijita, kusiyana kukuru pakati pemavhidhiyo emitemo yakange iri pasi peanorog systems, frame frame, ichiri nheyo yeDVD TV uye HDTV mitemo .
Chii Chimiro Chekuita Icho
Mune vhidhiyo (zvose Analog, HD, uye kunyange 4K Ultra HD ), sezvinongoita mufirimu, mifananidzo yaunowona paTVV kana kuti mavhidhiyo ekuratidzira chinyorwa inoratidzwa semafaira. Zvisinei, kunyange zvazvo izvo zvaunoona mufananidzo wakakwana, kune kusiyana kune nzira iyo mapurisa anotapurirwa nevashambadziri, anotumidzwa kuburikidza nekushambadzira kana mamiriro ezviviri, uye / kana kuratidzwa pane terevhizheni.
Mitsara uye Pixels
Mifananidzo yemifananidzo iyo inoparidzirwa iri kurarama kana yakanyorwa, yakanyorwa yakagadzirwa nemitsara yekuyera kana pixel rows . Zvisinei, kusiyana nemafuta, umo mufananidzo wose unoratidzwa pachigadziko kamwechete, mitsetse kana pixel inosvika mumufananidzo wevhidhiyo inoratidzwa pahwindo kubva pakutanga kwekona uye kuenda kune zasi. Iyi mitsara kana mapikisi emapikisi anogona kuratidzwa nenzira mbiri.
Nzira yekutanga yokuratidza mifananidzo ndeyokuparadzanisa mitsara mumiganhu miviri iyo mitsetse yose isingafungidziki kana mitsara yepikisi inotanga kuratidzwa uye ipapo mitsetse yose yakaverengwa kana pixel inoratidzirwa mberi, muchidimbu, kubudisa chimiro chakazara . Iyi inonzi inonzi interlacing kana interlaced scan .
Chechipiri nzira yekuratidza mifananidzo, iyo inoshandiswa muLCD, Plasma, DLP, OLED flat panel TV uye makombiyuta , inonzi inofambira mberi . Izvo zvinoreva izvi ndezvekuti pane kuratidza mitsara mune dzimwe nzira mbiri, kufambira mberi kunobvumira mitsara kana mitsara yepikisi kuti ienzaniswe sequentially. Izvi zvinoreva kuti mitsara miviri isinganzwisisiki uye kunyange yakaverengwa kana pixel inoratidzirwa mukuenzanisa kwenhamba.
NTSC nePAL
Nhamba yemitsara yakananga kana mitsara yepikisi inoratidza kukwanisa kuburitsa mufananidzo wakajeka, asi pane zvakawanda munyaya yacho. Zviri pachena pane iyi kuti huru iyo nhamba yemitsara yakajeka kana mitsara yepikisi, inonyanya kujekesa mufananidzo. Zvisinei, mukati mechitambo chevhidhiyo yeAnalogog, nhamba yemitsara yakajeka kana pixel rows yakagadzirirwa mukati megadziriro. Iyo miviri mikuru yakaita mavhidhiyo maitiro eNTSC nePAL .
NTSC yakabva kune imwe 525-line kana pixel row, 60 minda / 30 mafaira-per-yechipiri, pa 60Hz chirongwa chekutumira uye kuratidza mifananidzo yevhidhiyo. Iyi ndiyo nzira inopindira iyo iyo furimi imwe neimwe inoratidzwa mundima mbiri dzemiganhu 262 kana mapikisi emiromo iyo inoratidzwa zvimwe. Iyo minda miviri yakabatanidzwa kuitira kuti rimwe firimu revhidhiyo riratidzwe nemiganhu 525 kana pixel rows. NTSC yakasarudzwa semufananidzo wekufananidza wevhidhiyo muA.S., Canada, Mexico, dzimwe nzvimbo dzeCentral neSouth America, Japan, Taiwan, uye Korea.
PAL yakasarudzwa seyo inonyanya kuumbwa muNyika yeAnalogog terevhizheni nekudhiridza uye analog video inoratidza. PAL yakavakirwa pamutsara we625 kana pixel row, 50 munda / 25 mafaira wechipiri, 50Hz system. Chiratidzo chacho chinopindirana, seNTSC mumiti miviri, yakanyorwa nemiganhu 312 kana pixel inosara imwe neimwe. Sezvo kune zvishoma zvigadziri (25) zvinoratidzwa nechipiri, dzimwe nguva unogona kuona zvishoma zvishoma zvakananga mumufananidzo, zvakadai semhepo inotaridzika pafirimu yakafananidzirwa. Zvisinei, PAL inopa chimiro chepamusoro chechigadziro uye zviri nani kumativi emhando pane NTSC. Nyika dzine midzi muPAL system dzinosanganisira UK, Germany, Spain, Portugal, Italy, China, India, Australia, vazhinji veAfrica uye Middle East.
Kuti uwane mamwe ruzivo rwemashoko pamusoro pePAL neNTSC mavhidhiyo emagariro evanhu, kusanganisira izvo zvinonzi PAL neNTSC zvinyatsozvimiririra, tarisa shamwari yedu nyaya: An Overview Worldwide Video Standards .
DigitalTV / HDTV uye NTSC / PAL Frame Rates
Kunyange zvazvo kuwedzera kwekugadzirisa kukwanisa, dhijitimu yakashambadzirwa, uye inotsanangurwa yevhidhiyo software yehutano zvigadziriro inotsika kune vatengi, kana ichifananidza HDTV neAnalogog NTSC nePAL mitemo, nheyo inowanzodiwa yezvinhu zvose izvi ndiyo Frame Rate.
Maererano nemitambo yemavhidhiyo, muNTSC-based nyika kune mafaira makumi matatu akasiyana-siyana anonyatsoratidzwa mashure ose (1 fomu yakakwana yega yega 1/30 yechipiri), asi muPAL-based countries, pane mapuranga makumi maviri nemaviri akaratidzwa mashure ose (1 chimiro chakakwana chakaratidzwa zvose 1/25 zvechipiri). Mafaira aya anogona kuratidzwa achishandisa nzira ye Interlaced Scan (inomiririrwa ne 480i kana 1080i) kana Progressive Scan nzira (inomiririrwa ne 720p kana 1080p).
Nekushandiswa kweDynamic TV neHDTV , nheyo yekuti mapuranga anoratidzwa sei achiri kubva mumatambo ekutanga eNTSC nePAL mavhidhiyo evhidhiyo. Mukukurumidza-kuva-yekare NTSC-based-countries, Digital uye HDTV dziri kushandisa 30 Frame-per-second frame rate, munguva pfupi-kuva-PAL-based nyika iri kuita 25 Frame-per-second Frame frame.
NTSC-based Digital TV / HDTV Frame Rate
Kushandisa NTSC senheyo yeD Digital TV kana HDTV, kana mapuranga akaparidzirwa semufananidzo wakapindirana (1080i), furimi rimwe nerimwe rinoumbwa neminda miviri, uye imwe neimwe inoratidzira imwe neimwe yechitanhatu chechipiri, uye fomu yakakwana inoratidzirwa yega 30 ye chechipiri, achishandisa NTSC-based 30 frame-per-yechipiri purogiramu. Kana iyo faira inoparidzirwa mune inopfurikidza kupenya mafomu (720p kana 1080p) inoratidzirwa kaviri pamakumi matatu neimwe yechipiri. Muzviitiko zvose izvi, imwe yakasanangurwa tsanangudzo yepamusoro inoratidzirwa yega 30 yeimwe yechipiri mune zvekare NTSC-based countries.
PAL-based Digital TV / HDTV Frame Rate
Kushandisa PAL senheyo yeD Digital TV kana HDTV, kana mapuranga achiparidzirwa semufananidzo wakapindirana (1080i), furimi rimwe nerimwe rinoumbwa neminda miviri, uye munda mumwe nomumwe unoratidzwa makumi mashanu epiri yechipiri, uye fomu yakazara inoratidzira yega 25 chechipiri, achishandisa PAL-based 25 frame-per-second frame rate. Kana iyo faira inoparidzirwa mune inopfurikidza kupenya mafomu ( 720p kana 1080p ) inoratidzirwa kaviri pairi neimwe ye 25 yechipiri. Muzviitiko zvose izvi, imwe yakasanangurwa tsanangudzo yepamusoro inoratidzirwa yose ye 25 yechipiri pane zveTV mune imwe nyika yePAL-based.
Kuti uone zvakadzama paVideo Frame Rate, pamwe neRefresh Rate, iyo inowedzera basa rinoitwa neTV iyo inobatawo kuti chifananidzo chinotarisa sei pahwindo, tarisa shamwari yedu yekuti: Video Frame Rate vs Screen Refresh Nhamba .
The Bottom Line
Dhidhiyo TV, HDTV, uye Ultra HD, kunyange zvazvo hukuru huchikwira mberi maererano nezvamunoona paTV kana purojekiti yakatarisa, kunyanya maererano nehuwandu hwekugadzirisa uye tsanangudzo, ichiri kubva mumagariro eanalogo anopfuura makore 60 akare. Somugumisiro, kune uye ichava, nokuda kwemazuva anotevera, kusiyana kweDivhi TV neHDTV zvinoshandiswa munyika yose, izvo zvinosimbisa chipingamupinyi kuchokwadi chevhidhiyo yemitambo yenyika yose kune vashandi nevatengi.
Uyewo, ngatirege kukanganwa kuti pasinei nokuti NATC NALC nePAL TV zvinobudiswa, kana kuti, zvinorega kuwedzera kwenyika dzakawanda sezvo kutendeuka kunopfuurira kudijiti uye HDTV kupfurikidza chete, kune zvakawanda zvakawanda zveNTSC nePAL-based video mitambo yemitambo, yakadai seVCRs, makhamikoroni analog, uye kwete-HDMI yakagadzirwa neDVD vari kushandiswa munyika yose iyo yakavharwa uye inoonekwa paHDTVs.
Mukuwedzera, kunyange nemafomu, akadai seBlu-ray Disc, pane zviitiko apo kunyange zvazvo firimu kana huru yevhidhiyo yakagadzirwa inogona kunge iri muH HD, zvimwe zvevhidhiyo yezvekuwedzera inogona kunge iri mune zvigadziriswa zvinogadziriswa NTSC kana PAL mafomu.
Zvakakoshawo kuti kunyange zvazvo zvinyorwa zveK 4K zvino zvawanikwa zvikuru kuburikidza nekushambadzira uye Ultra HD Blu-ray Disc , 4K TV inobudiswa mitemo ichiri muzvikamu zvokutanga zvekushandiswa, mavhidhiyo ekuratidza mavhidhiyo (maTV) ari 4K-anoenderana achiri kuda kutsigira analog video formatats chero bedzi pane analog video transmission uye zvigadzirwa zvekushandisa zviri kushandiswa. Uyezve, inyeverwa 8K kushambadza uye kuparidzira hakusi kure zvakadaro.
Kunyange zvazvo zuva racho richauya (zvichida nokukurumidza kupfuura gare gare), kwaunenge usisakwanise kushandisa mavhidhiyo eAnalogog, akadai seVCRs, kugamuchirwa kwevhisi yemavhidhiyo chaiyo yose haisi ikozvino.