Txij li thaum lub advent ntawm lub digital TV teeb liab, ntau thiab ntau tshaj broadcasting tuam txhab uas muag maj txo lub hwj chim ntawm tag nrho cov hwj chim analog TV transmitters thiab siv digital TV transmitters ntau thiab ntau dua vim muaj ntau yam zoo ntawm cov tshuab digital. Ntawm no yog lo lus nug: Dab tsi yog qhov txawv ntawm cov analog TV transmitter thiab digital TV transmitter?
Kev sib koom yog Kev Saib Xyuas!
Cov ntsiab lus
Txhais ntawm TV Transmitter
A TV transmitter yog ib qho khoom siv hluav taws xob uas radiates xov tooj cua tsis, uas nqa cov teeb liab video sawv cev rau cov duab dynamic thiab lub suab teeb liab synchronized nrog nws. Nws yuav tau txais los ntawm lub TV receiver thiab tso saib cov duab ntawm qhov screen thiab emit ib tug coj lub suab. Nws cov zaus ua haujlwm yog txwv rau VHF thiab UHF zaus bands, thiab nws lub zog ua haujlwm ntawm 5W txog 10kW. Nws yog feem ntau siv hauv kev tshaj tawm hauv xov tooj cua xws li TV chaw nres tsheb.
TV transmitters xa xov tooj cua hauv 2 txoj hauv kev:
- Analog kis tau tus mob - Cov ntaub ntawv duab thiab suab raug xa mus los ntawm lub teeb liab analog hloov mus rau lub xov tooj cua. Modulation hom ntawm lub suab yog FM thiab cov video yog AM.
- Digital kis tau tus mob - Cov duab thiab suab yog kis los ntawm cov cim "1" thiab "0".
Ob txoj kev sib kis tau ua rau muaj qhov sib txawv ntawm analog TV transmitter thiab digital TV transmitter. Cov kev sib txawv no yuav piav qhia meej hauv qab no.
Qhov sib txawv ntawm Analog & Digital TV Transmitter
Raws li tau hais los saum no, cov kev sib txawv ntawm kev xa cov teeb liab yog qhov laj thawj rau qhov sib txawv ntawm analog TV transmitter thiab digital TV transmitter hauv ntau qhov sib txawv, uas feem ntau yog hauv 4 yam.
Muaj peev xwm ntawm TV channels
Analog signals yuav tsum nyob rau hauv ib tug dav zaus band. Thaum pib, FCC faib txhua 6MHz rau hauv ib lub channel ntawm cov zaus tso cai, thiab ib lub channel haum rau ib lub TV channel. Yog li ntawd, lub analog TV transmitter tshaj tawm ib qho txwv ntawm TV raws.
Tom qab kev saws me nyuam ntawm lub TV digital transmitter, txawm hais tias qhov tso cai zaus band thiab channel bandwidth zoo ib yam ua ntej, cov teeb liab digital yuav tsum tau qis dua bandwidth. Tam sim no 6MHz channel tuaj yeem ua raws li 3-6 TV channels. Yog li ntawd, lub digital TV transmitter tuaj yeem xa ntau lub TV raws.
Kev Teeb Meem Kab Mob
Vim hais tias cov analog TV transmitter siv FM modulation thiab AM modulation, thaum lub digital TV transmitter siv cov teeb liab digital sawv cev los ntawm 1 thiab 0. Yog li ntawd, nyob rau hauv cov nqe lus ntawm cov teeb liab kis tau tus mob, digital TV transmitter muaj cov yam ntxwv no:
- Nws tuaj yeem xa cov teeb liab hla mus ntev yam tsis muaj teeb liab distortion, kom ntseeg tau tias digital thiab suab zoo.
- Lub Digital TV transmitter tuaj yeem xa cov duab txhais tau zoo dua video zoo thiab lub suab meej dua.
- Lub TV digital transmitter txhawb kev sib kis ntawm cov duab edited, xws li hloov qhov kev daws teeb meem ntawm daim duab hauv ib feem, ntxiv cov ntawv ntxiv, animation, thiab lwm yam kom txhawb cov duab.
Cov xov tooj cua digital TV tuaj yeem xa cov kev pabcuam TV nthuav dav rau cov neeg tuaj saib. Nws yog cov thev naus laus zis digital uas tshaj tawm TV tshaj tawm nkag mus rau HDTV era.
Teeb Liab Lub Zog
Hauv kev tshaj tawm cov teeb liab analog, lub TV receiver tsis xav tau lub zog siab ntawm xov tooj cua teeb liab kis los ntawm analog TV transmitter. Txawm hais tias lub xov tooj cua tsis muaj zog tuaj yeem ua rau lub xov tooj cua tau txais cov duab thiab suab, tsuas yog mus nrog cov daus thiab suab nrov.
Ntawm qhov tod tes, lub digital TV receiver xav tau lub teeb liab lub zog kom siab tshaj ib theem, ces nws tuaj yeem ua si cov duab thiab suab. Tab sis yog tias lub teeb liab lub zog tsis txaus, tsuas muaj qhov tsaus nti sab laug xwb.
Kev yuav nqi
Analog TV transmitter thiab analog TV tsis muaj kev xav tau siab rau lwm yam khoom siv. Cov neeg tuaj yeem yuav cov khoom siv analog tv ntawm tus nqi qis. Txawm li cas los xij, kev tshaj tawm digital muaj qhov xav tau ntau dua rau cov cuab yeej cuam tshuam vim tias cov cuab yeej siv tau yooj yim dua, uas txhais tau hais tias tus neeg teb xov tooj thiab cov neeg tuaj saib yuav tsum tau them nyiaj ntau los hloov kho lawv cov khoom siv TV xws li digital TV transmitter, digital TV kav hlau txais xov, digital TV receiver, thiab lwm yam. .
Vim muaj ntau hom kev ua haujlwm ntawm digital TV transmitter thiab analog TV transmitter, nws tau coj ntau yam cuam tshuam rau cov neeg ua haujlwm thiab cov neeg saib, suav nrog tus nqi, teeb liab kis tau tus mob zoo, saib kev paub, kev tsim cov ntsiab lus, thiab lwm yam.
Yuav ua li cas xaiv qhov zoo tshaj plaws TV Transmitter?
Thaum xaiv lub TV transmitter, ntxiv rau xaiv seb nws yog ib qho digital TV transmitter lossis ib qho analog TV transmitter, nws tseem yuav tsum tau xav txog nws qhov kev ua haujlwm ntau zaus, kev sib cais ntawm lub suab zaus thiab video zaus, thiab bandwidth.
Xov tooj cua txaus
Nws txhais tau hais tias muaj ntau lub xov tooj cua zaus rau TV transmitter. Cov xov tooj cua zaus tau tso cai tam sim no rau TV transmitter yog HF, VHF, thiab UHF. Cov nram qab no yog cov zaus band nyob rau hauv kom meej:
- 54 txog 88 MHz rau channel 2 txog 6
- 174 txog 216 MHz channels 7 txog 13
- 470 txog 890 MHz rau UHF raws 14 txog 83
Lub TV transmitter koj xaiv yuav tsum muaj peev xwm ua hauj lwm nyob rau hauv saum toj no peb zaus bands.
Kev sib cais siab ntawm Suab zaus thiab video zaus
Raws li Asmeskas txoj cai lij choj, qhov nruab nrab zaus ntawm lub aural cab kuj yuav tsum yog 4.5 MHz ± 5 kHz tshaj qhov zaus ntawm lub qhov muag pom kev ntawm qhov tso zis ntawm cov khoom siv los yog ua cov khoom siv ntawm lub cable TV.nias ntawm no
Dav Dav Dav
Nws yog hais txog ntau zaus ntawm cov xov tooj cua tshaj tawm los ntawm TV transmitter, uas yog, bandwidth nws siv. Qhov dav ntawm bandwidth, ntau lub TV channel tuaj yeem nqa tau.
Cov saum toj no yog cov txheej txheem thoob ntiaj teb ntawm kev tshaj tawm cov qauv tsim los ntawm ITU, uas tau taw qhia tias cov xov tooj tseem ceeb tshaj plaws ntawm TV transmitter yog Kev sib cais zaus ntawm kev hnov lus thiab pom cov neeg nqa khoom, Xov tooj cua Frequency, thiab Bandwidth. Yog tias koj xav tau hloov kho lossis yuav TV transmitters, thov nrhiav cov khoom siv hauv xov tooj cua txhim khu kev qha xws li FMUSER, uas tuaj yeem muab koj cov khoom zoo, tus nqi qis digital & analog TV transmitters thiab lwm yam khoom siv, xws li TV kav hlau txais xov thiab lwm yam. Yog koj txaus siab, nias ntawm no kom paub ntau ntxiv.
FMUSER CZH518A-3KW Professional VHF/UHF Analog TV Transmitter rau TV noj
Cov Lus Nug
1. Q: Ntev npaum li cas lub TV Transmitter tuaj yeem tshaj tawm?
A: Nws tuaj yeem tshaj tawm qhov deb li ntawm 40 - 60 mais.
A TV transmitter tuaj yeem xa tawm ntawm cov zaus hauv VHF, thiab UHF bands. Txij li thaum lub xov tooj cua nthwv dej ntawm cov zaus no mus los ntawm txoj kab ntawm qhov pom, lawv tuaj yeem taug kev deb ntawm 40-60 mais nyob ntawm qhov siab ntawm qhov chaw nres tsheb transmitter.
2. Q: Dab tsi tuaj yeem cuam tshuam nrog cov teeb liab TV?
A: Cov teeb meem nyob ib ncig ntawm lub TV transmitter yuav cuam tshuam rau TV teeb liab zoo.
Feem ntau, cov kev cuam tshuam yog cov nyob nruab nrab ntawm koj lub tsev tshaj tawm hauv zos thiab koj lub TV kav hlau txais xov Over-the-Air uas tuaj yeem cuam tshuam cov teeb liab TV, suav nrog ntoo, roob & hav, vaj tse loj, thiab lwm yam.
3. Q: Cov teeb liab TV kis tau li cas?
A: Lawv kis tau nyob rau hauv daim ntawv ntawm cov xov tooj cua yoj mus rau saum huab cua.
Lub teeb liab TV yog nqa los ntawm cable mus rau lub kav hlau txais xov, uas feem ntau yog nyob rau saum toj siab lossis lub tsev. Cov teeb liab tau tshaj tawm hauv huab cua raws li xov tooj cua nthwv dej. Lawv tuaj yeem taug kev hauv huab cua ntawm qhov ceev ntawm lub teeb.
4. Q: Dab tsi yog qhov Zaus Band ntawm TV Transmitter?
A: Nws tuaj yeem tshaj tawm ntawm VHF thiab UHF bands.
A TV transmitter tuaj yeem xa hauv VHF thiab UHF bands. Cov nram qab no yog cov zaus band nyob rau hauv kom meej:
- 54 txog 88 MHz rau channel 2 txog 6
- 174 txog 216 MHz channels 7 txog 13
- 470 txog 890 MHz rau UHF raws 14 txog 83
xaus
Hais txog qhov twg, peb paub tias analog TV transmitters thiab digital TV transmitters tuaj yeem ua tau raws li qhov xav tau sib txawv. Koj puas xav yuav TV transmitters? FMUSER yog ib lub chaw muab kev ntseeg siab ntawm cov khoom siv xov tooj cua tshaj tawm thiab cov kev daws teeb meem, uas tuaj yeem muab rau koj ua kom tiav TV transmitter pob suav nrog analog & digital TV transmitters rau muag, sib tw TV kav hlau txais xov rau muag. thov hu rau FMUSER. Peb siv zog ua kom peb cov neeg siv khoom hnov thiab nkag siab.
Kuj nyeem
