Video Cov Qauv Tsis Txhob Tib Qhov Txhua Qhov Chaw
Vim tias kuv qhov chaw thoob lub ntiaj teb, kuv tau txais ntau cov lus nug txog lub ntsiab lus ntawm cov qauv yeeb yaj kiab uas tiv thaiv tau video ntawm daim kab xev kaw hauv Teb Chaws Asmeskas, piv txwv li, nyob rau VCR ntawm Eastern Europe. Los yog, nyob rau hauv lwm rooj plaub, ib tug neeg hauv UK tau mus hauv Teb Chaws Asmeskas, thaij video hauv lawv cov koob yees duab, tab sis tsis tuaj yeem saib lawv cov ntawv kaw hauv Teb Chaws Asmeskas TV lossis muab luam tawm rau US VCR. Qhov no tseem cuam tshuam cov DVDs uas tau muag hauv lwm lub teb chaws zoo li, txawm tias cov qauv ntawm DVD kuj muaj qhov tseem ceeb hu ua Lub Nroog Coding, uas yog ib qho "lwm-tau-worms". Qhov no yog ntxiv nrog rau cov ntsiab lus yees duab video ntawm qhov no, thiab piav qhia ntxiv hauv kuv tsab ntawv ntxiv "Cheeb Tsam Codes: DVDs Dirty Secret" .
Vim li cas qhov no? Puas muaj kev daws teeb meem rau qhov no thiab lwm yam teeb meem cuam tshuam nrog cov qauv kev yees duab sib txawv?
Thaum lub sij hawm siv xov tooj cua sib kis, piv txwv, nyiam cov txheej txheem uas siv nyob txhua qhov hauv lub Ntiaj Teb, lub TV tsis zoo li.
Hauv lub xeev tam sim no ntawm analog TV, lub Ntiaj Teb yog muab faib rau peb Cov Qauv uas tsis paub tseeb: NTSC, PAL, thiab SECAM.
Vim li cas peb cov qauv lossis cov txheej txheem? Yeej, lub TV yog "tsim ua" nyob rau ntau lub sijhawm hauv ntiaj teb (US, UK, thiab Fab Kis). Txoj cai zoo nkauj npaum li cas ntawm lub sijhawm uas lub cev yuav ua haujlwm raws li lub tebchaws tus qauv hauv cov tebchaws no. Tsis tas li ntawd, koj yuav tsum nco ntsoov tias tsis muaj kev pom zoo thaum lub sij hawm cov TV Broadcast Systems raug muab tso rau hauv qhov chaw, rau qhov nce ntawm "Ntiaj Teb" lub hnub nyoog peb nyob hauv hnub no, qhov twg cov ntaub ntawv muab sib hloov ua hluav taws xob yooj yim xws li sib tham nrog ib tus neeg nyob ze.
Txheej txheem cej luam: NTSC, PAL, SECAM
NTSC
NTSC yog cov txheej txheem Asmesliskas (American Standard) uas tau tsim nyob rau xyoo 1941 los ua tus thawj tshaj tawm hauv TV thiab video hom uas tseem siv. NTSC yog lub koom haum National Television Standards Committee thiab tau pom zoo los ntawm FCC (Tsoom Fwv Teb Chaws Sib Koom Tes) raws li tus txheej txheem rau TV broadcasting hauv Teb Chaws Asmeskas
NTSC yog nce raws 525-kab, 60 thaj tsam / 30 thav-ib-thib ob ntawm 60Hz kev sib txuas lus thiab tso saib cov 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.
Qhov system no ua haujlwm zoo, tab sis muaj ib qho kev nyuab siab yog tias cov tshev yeeb yaj kiab hauv TV thiab cov duab tsis yog ib feem ntawm qhov kev ua thaum uas lub tso cai thawj zaug tau pom zoo. Ib qho teeb meem tshwm sim ua li cas los teeb nrog Xim nrog NTSC yam tsis tau ua cov tsheej lab ntawm B / W televisions hauv kev siv los ntawm lub xyoo 1950 dhau los. Thaum kawg, tus txheej txheem ntxiv rau Xim rau NTSC qhov system tau txais los ntawm 1953. Txawm li cas los, qhov kev siv ntawm cov xim rau hauv NTSC hom ntawv yog qhov tsis muaj zog ntawm lub system, yog li lub sijhawm rau NTSC tau paub los ntawm ntau tus kws tshaj li "Tsis Muaj Twice Cov Tibyam Xim " . Puas tau pom tias qhov xim zoo thiab sib haum mas nws txawv me ntsis ntawm cov chaw noj qab haus huv?
NTSC yog cov kev cai analog yees duab hauv Teb Chaws Asmeskas, Canada, Mexico, qee feem ntawm Central thiab South America, Nyiv, Taiwan, thiab Kauslim teb. Yog xav paub ntxiv txog lwm lub tebchaws.
PAL
PAL yog cov tseem ceeb hauv lub ntiaj teb rau analog TV broadcasting thiab video yeeb yaj duab (thov txim US) thiab raws li kab 625, 50 teb / 25 thav ntawv thib ob, 50HZ system. Qhov teeb liab yog cuam tshuam, xws li NTSC mus rau ob thaj teb, muaj li ntawm 312 kab txhua. Ob qho cim qhov sib txawv yog ib qho: ib daim duab zoo nkauj tshaj NTSC vim tias muaj ntau ntxiv ntawm cov kab scan. Ob: txij li qhov xim yog ib feem ntawm qhov standard los ntawm thaum pib, xim sib xws ntawm cov noj thiab TVs yog zoo dua. Muaj ib sab rau PAL tiam sis, vim muaj tsawg tus thav ntawv (25) tshwm sim ib pliag, qee zaum koj tuaj yeem pom qhov txawv me ntsis hauv daim duab, zoo ib yam li qhov muag pom ntawm lub yeeb yaj kiab.
Lus cim: Brazil siv ntau hom PAL, uas yog hu ua PAL-M. PAL-M siv 525 kab / 60 HZ. PAL-M yog sib xws nrog B / W nkaus xwb ua si ntawm NTSC hom ntawv.
Txij li thaum PAL thiab nws cov kev txawv txav muaj xws li ntiaj teb domination, nws tau nicknamed " Kev Ncaj Ncees Tom Qab ", los ntawm cov neeg hauv cov hauj lwm video. Lub teb chaws ntawm PAL lawv 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
SECAM yog tus "outlaw" ntawm cov qauv siv video analog. Tsim tawm hauv Fabkis (Nws zoo nkaus li Fabkis yog txawv ntawm cov teeb meem kev tsim nyog), SECAM, thaum lub siab tshaj rau NTSC, tsis yog PAL (qhov tseeb ntau lub teb chaws uas tau xaiv SECAM yog hloov mus rau PAL los yog muaj ob hom kev tshaj tawm hauv PAL thiab SECAM).
Ib yam li PAL, nws yog 625 kab, 50 daim teb / 25 thooj ib qho kev sib txuas lus nrog ob qho kev sib txuas, tab sis qhov xim feem ntau yog siv ntau dua PAL los yog NTSC. Nyob rau hauv qhov tseeb, SECAM stands rau (ua lus Askiv) Sequential xim nrog nco. Nyob rau hauv video txoj hauj lwm, nws tau raug dubbed " Something Contrary rau American Txoj kev Methods ", vim nws txawv xim tswj system. Lub teb chaws nyob hauv SECAM muaj xws li Fabkis, Russia, Eastern Europe, thiab qee qhov chaw hauv Middle East.
Txawm li cas los xij, ib qho tseem ceeb tshaj plaws los qhia txog SECAM yog tias nws yog ib hom xov xwm tshaj tawm hauv TV (thiab kuj yog hom VHS cov ntaub ntawv rau SECAM transmissions) - tab sis nws tsis yog ib qho DVD playback format. Cov DVDs yog siv tau hauv NTSC los yog PAL thiab tau xaiv rau cov thaj chaw tshwj xeeb, nrog rau kev ua si sib luag. Nyob hauv cov tebchaws uas siv cov txheej txheem SECAM tshaj tawm, cov DVDs yeej txawj siv cov hom PAL video.
Hauv lwm cov lus, cov neeg uas nyob hauv cov tebchaws uas siv SECAM lub tshev yeeb yaj kiab tawm, kuj siv hom PAL thaum nws tuaj yeem ua video playback. Txhua tus neeg tau siv SECAM cov TV yuav saib tau ob qho tib si ntawm SECAM tshaj tawm suab los yog PAL ncaj qha video teebmeem, xws li los ntawm ib qhov chaw, xws li DVD player, VCR, DVR, etc ...
Txav tawm tag nrho cov technical jargon txog NTSC, PAL, thiab SECAM, lub neej ntawm cov yeeb yaj duab hauv TV no txhais tau hais tias lub YEEJ YEEJ no yuav tsis zoo ib yam li YEEJ YAM NO (qhov twg los yog NTAWM NO). Lub ntsiab yog vim li cas txhua qhov kev sib raug zoo yog tsis raws li qhov sib txawv ntawm cov qauv thiab cov khoom siv bandwidth, uas ua rau cov khoom siv yees duab thiab DVDs kaw hauv ib lub hauv kev ua si hauv lwm lub tshuab.
Kev Txhaum Zog Siv
Txawm li cas los xij, muaj cov kev daws teeb meem rau cov kev sib tw no twb muaj nyob rau hauv qhov chaw ua lag luam. Hauv Europe, piv txwv, ntau TVs, VCRs, thiab DVD players muag yog ob qho tib si NTSC thiab PAL muaj peev xwm. Hauv Teb Chaws Asmeskas, qhov teeb meem no yog hais los ntawm cov khw muag khoom muag uas tsim tawm hauv cov khoom siv hluav taws xob thoob ntiaj teb. Qee cov kev kawm online tshaj yog International Electronics, thiab World Import.
Tsis tas li, yog tias koj tshwm sim nyob rau hauv ib lub nroog loj, xws li New York, Los Angeles, los sis Miami, Florida, qee cov khw muag khoom loj thiab tsis ywj pheej kuj tau siv ntau lub VCRs. Yog li, yog tias koj muaj cov txheeb ze lossis cov phooj ywg nyob rau sab nrauv, koj tuaj yeem tsim thiab luam cov koob yees duab lossis cov yeeb yaj duab uas koj kaw tawm TV thiab xa cov ntawv luam tawm rau lawv thiab koj tuaj yeem ua si PAL los yog SECAM cov yeeb yaj duab lawv xa tuaj rau koj.
Txawm li cas los xij, yog tias koj tsis muaj ib qho yuav tsum tau muaj ntau lub vCR VCR, tiam sis tseem yuav tsum tau muaj cov video suab paj nruag hloov dua siab tshiab rau lwm qhov, muaj cov kev pabcuam hauv txhua lub nroog loj uas tuaj yeem ua qhov no. Tsuas xyuas hauv phau ntawv xov tooj hauv zos hauv Video Production lossis Video Editing Services. Tus nqi ntawm hloov ib daim kab xev tsis kim heev.
Thoob Ntiaj Teb Cov Kev Cai Rau Cov Luam Digital TV
Thaum kawg, koj yuav xav tias ntiaj teb kev siv Digital TV thiab HDTV yuav daws qhov teebmeem ntawm cov duab tsis thwj, tab sis qhov no tsis yog qhov teeb meem. Muaj "lub ntiaj teb" ntawm qhov kev tsis sib haum xeeb uas nyob ib puag ncig ntawm kev siv txoj cai rau digital television broadcast thiab ua si rov qab video high definition video systems.
Tebchaws Asmeskas thiab ob peb North American thiab Esxias lub tebchaws tau siv ATSC (Advanced TV Standards Committee standard, Tebchaws Europe tau txais DVB (Digital Broadcast Broadcasting), thiab Nyiv yog qhov zoo rau nws tus kheej, ISDB (Integrated Services Digital Broadcasting). xav paub ntxiv txog lub Xeev Cov Txheej Txheem Kev Kub Ntxhov rau TV / HDTV, xyuas cov ntawv ceeb toom los ntawm EE Times.
Tsis tas li ntawd, Txawm hais tias muaj ntau qhov sib txawv ntawm HD thiab analog yees duab, tus ncej tus nqi sib txawv tseem nyob hauv PAL thiab NTSC lub teb chaws.
Nyob hauv cov tebchaws uas tau nyob rau hauv NTSC analog TV / video system, kom deb li deb, cov qauv siv HD broadcasting thiab HD cov qauv (xws li Blu-Ray thiab HD-DVD) tseem ua raws li NTSC tus qauv ntawm 30 thav ntawm ib, cov txheej txheem HD hauv cov tebchaws uas tau pom los ntawm PAL broadcast / video txheem los yog cov txheej txheem SECAM tshaj tawm teev tus nqi ntawm PAL 25 vib nas this ob.
Zoo hmoo, coob tus neeg txhais tias cov TV nrov tshaj plaws, thiab tag nrho cov video projectors, yuav muaj peev xwm nthuav tawm 25 thav duab thiab 30 ncej ntawm ob hom thib ob hom xov tooj cua.
Tshem tawm txhua txoj hauv kev hais txog cov xov tooj digital / HDTV, qhov no txhais tau hais tias, hauv xov tooj cua, cable, thiab satellite TV hauv lub hnub nyoog digital, yuav muaj kev tsis sib haum xeeb nyob hauv lub ntiaj teb cov teb chaws. Txawm li cas los xij, nrog qhov kev ua ntawm kev ua video thiab kev hloov chips hauv ntau cov khoom siv video, qhov teeb meem ntawm kev ua si rov qab yees duab yuav ua rau tsawg dua qhov teeb meem raws li lub sij hawm tsiv rau.