Selokhu kwavela isignali ye-TV yedijithali, izinkampani zokusakaza zanda kancane kancane zanciphisa amandla wamandla aphelele ama-TV e-analog futhi asebenzise ama-TV edijithali ngokwandayo ngenxa yezinzuzo ezihlukahlukene zobuchwepheshe bedijithali. Nanku umbuzo oza: Yiziphi izici ezihlukene phakathi kwesidlulisi se-analog TV kanye nesidlulisi se-TV yedijithali?
Ukwabelana Kuyanakekela!
Okuqukethwe
Incazelo ye-TV Transmitter
A I-TV transmitter iyisisetshenziswa se-elekthronikhi esikhipha amaza omsakazo, esiphatha isignali yevidiyo emele isithombe esiguqukayo kanye nesiginali yomsindo evumelaniswa nayo. Izotholwa yisamukeli sikamabonakude bese siveza isithombe esikrinini bese sikhipha umsindo ohambisanayo. Imvamisa yokusebenza kwayo ikhawulelwe kumabhendi amafrikhwensi e-VHF kanye ne-UHF, futhi amandla ayo okusebenza asukela ku-5W kuya ku-10kW. Isetshenziswa kaningi emkhakheni wokusakazwa kwethelevishini njengeziteshi ze-tv.
Ama-TV transmitters asakaza amaza omsakazo ngezindlela ezi-2:
- Ukudluliswa kwe-analog - Ulwazi lwesithombe nolwazi kudluliselwa ngesignali ye-analog ehlelwe kusithwali somsakazo. Imodi yokushintshashintsha yomsindo i-FM kanti eyevidiyo ithi AM.
- Ukudluliswa kwedijithali - Izithombe nemisindo kudluliselwa ngamasignali edijithali "1" kanye "0".
Izindlela ezimbili zokudlulisela ziholela ezicini ezihlukene zesidlulisi se-analog TV kanye nesidlulisi se-TV yedijithali. Lo mehluko uzochazwa ngokuningiliziwe kokulandelayo.
Umehluko phakathi kwe-Analog&Digital TV Transmitter
Njengoba kushiwo ngenhla, izindlela ezihlukene zokudlulisa amasignali ziyisizathu esibalulekile somehluko phakathi kwesidlulisi se-TV ye-analog nesidlulisi se-TV yedijithali ezicini ezihlukene, okuyizici ezi-4 kakhulu.
Amandla eziteshi ze-TV
Amasignali e-analogi adinga ukuthatha ibhendi yefrikhwensi ebanzi. Ekuqaleni, i-FCC ihlukanisa njalo i-6MHz ibe yishaneli eyodwa phakathi kwebhendi yefrikhwensi evunyelwe, futhi isiteshi esisodwa sithatha isiteshi se-TV esisodwa. Ngakho-ke, i-analog TV transmitter isakaza inani elilinganiselwe leziteshi ze-TV.
Ngemva kokwamukelwa kwe-TV yedijithali, nakuba ibhendi yefrikhwensi evunyelwe kanye nomkhawulokudonsa wesiteshi kuyafana ngaphambili, isignali yedijithali idinga umkhawulokudonsa ophansi. Manje isiteshi esingu-6MHz singamukela iziteshi ze-TV ezi-3-6. Ngakho-ke, isidlulisi se-TV yedijithali singadlulisela iziteshi eziningi ze-TV.
Ukuthunyelwa kweSignal
Ngenxa yokuthi isidluliseli se-TV ye-analog sisebenzisa ukushintshashintsha kwe-FM kanye nokushintshashintsha kwe-AM, kuyilapho isidlulisi se-TV yedijithali sisebenzisa isignali yedijithali emelwe ngu-1 no-0. Ngakho-ke, mayelana nokudluliswa kwesignali, isidlulisi se-TV yedijithali sinalezi zici:
- Ingakwazi ukudlulisa amasignali ebangeni elide ngaphandle kokuhlanekezelwa kwesignali, iqinisekisa ikhwalithi yedijithali nomsindo.
- I-Digital TV transmitter ingadlulisela ikhwalithi yesithombe sevidiyo enencazelo ephezulu nomsindo ocacile.
- I-TV yedijithali ye-transmitter isekela ukudluliswa kwezithombe ezihleliwe, njengokushintsha ukulungiswa kwesithombe engxenyeni ethile, ukwengeza umbhalo owengeziwe, ukugqwayiza, njll. ukunothisa isithombe.
Umsakazi we-TV wedijithali ungadlulisela izinhlelo ze-TV ezithakazelisayo kakhulu ezithamelini. Ubuchwepheshe bedijithali obumemezela ukusakazwa kwe-TV kungena enkathini ye-HDTV.
Amandla Esiginali
Ekusakazweni kwesignali ye-analogi, umamukeli kamabonakude akadingi amandla aphezulu esignali yomsakazo esakazwa isidlulisi se-TV se-analog. Ngisho noma isignali yomsakazo inamandla alinganiselwe umamukeli wethelevishini angadlala isithombe nomsindo, ahambisane namakhekheba eqhwa nomsindo.
Ngakolunye uhlangothi, isamukeli sethelevishini yedijithali sidinga amandla esiginali ukuthi sibe phezulu ezingeni elithile, bese singadlala isithombe nomsindo. Kodwa uma amandla esignali enganele, kukhona okusele okumnyama kuphela.
Izindleko Zokuthenga
I-TV ye-analog TV kanye ne-analog TV ayinazo izidingo eziphezulu zezinye izinto ezifanele. Abantu bangathenga isethi yemishini ye-analog tv ngezindleko eziphansi. Kodwa-ke, ukusakaza ngedijithali kunesidingo esiphezulu semishini efanele ngenxa yobuchwepheshe obuyinkimbinkimbi, okusho ukuthi opharetha nabalaleli kufanele bakhokhe imali eningi ukuze babuyekeze imishini yabo ye-TV efana ne-digital TV transmitter, i-antenna ye-TV yedijithali, isamukeli se-TV yedijithali, njalonjalo. .
Ngenxa yezindlela ezihlukene zokusebenza zesidlulisi se-TV yedijithali nesidlulisi se-TV ye-analogi, ilethe imithelela ehlukahlukene kubaqhubi nababukeli, okuhlanganisa izindleko, ikhwalithi yokudlulisela isignali, ulwazi lokubuka, idizayini yokuqukethwe kohlelo, njalonjalo.
Ungayikhetha Kanjani I-TV Transmitter Engcono Kakhulu?
Lapho ukhetha isidlulisi se-TV, ngaphezu kokukhetha ukuthi siyi-a i-digital TV transmitter noma i i-analog TV transmitter, kuyadingeka futhi ukuthi kucutshungulwe ububanzi bokusebenza kwayo, ukuhlukaniswa phakathi kwefrikhwensi yomsindo nefrikhwensi yevidiyo, kanye nomkhawulokudonsa.
IRadio Frequency eyanele
Kusho ububanzi obutholakalayo befrikhwensi yomsakazo we-TV transmitter. Amabanga amafrikhwensi omsakazo avunyelwe okwamanje kusidlulisi se-TV yi-HF, i-VHF, ne-UHF. Okulandelayo yibhendi yefrikhwensi ngokuningiliziwe:
- 54 kuya ku-88 MHz kumashaneli 2 kuya ku-6
- 174 kuya ku-216 MHz iziteshi 7 kuya ku-13
- 470 kuya ku-890 MHz kumashaneli e-UHF 14 kuya ku-83
I-TV transmitter oyikhethayo kufanele ikwazi ukusebenza kumabhendi amafrikhwensi amathathu angenhla.
Ukuhlukaniswa Okuphezulu Kwemvamisa Yomsindo kanye Nemvamisa Yevidiyo
Ngokomthetho wase-US, imvamisa emaphakathi yenkampani yenethiwekhi kufanele ibe ngu-4.5 MHz ± 5 kHz ngaphezu kwefrikhwensi yesiphathi esibonakalayo ekuphumeni kwempahla yokumodulayo noma yokucubungula yesistimu kamabonakude wekhebula.Chofoza lapha
Umkhawulokudonsa obanzi
Kubhekiselwa kububanzi befrikhwensi yamasignali omsakazo asakazwa isidlulisi se-TV, okungukuthi, i-bandwidth esisebenzisayo. Lapho umkhawulokudonsa ubanzi, iziteshi ze-TV zingathwalwa.
Okungenhla wuhlelo lwamazwe ngamazwe lwezindinganiso zokusakaza olwakhiwe yi-ITU, eveze ukuthi izinombolo ezibaluleke kakhulu zesidlulisi se-TV ukuhlukaniswa kwe-Frequency phakathi kwezinkampani eziphathwayo ezizwayo nezibonwayo, iRadio Frequency, kanye ne-Bandwidth. Uma udinga ukubuyekeza noma ukuthenga ama-transmitters e-TV, sicela ubheke umhlinzeki wezinto zokusakaza zomsakazo onokwethenjelwa ofana no-FMUSER, ongakunikeza ama-TV edijithali nezindleko eziphansi kanye nezisetshenziswa ezihlobene, njengezimpondo ze-TV nokunye. Uma unentshisekelo, Chofoza lapha ukuze ufunde kabanzi.
I-FMUSER CZH518A-3KW Professional VHF/UHF I-Analog TV Transmitter yeziteshi ze-TV
imibuzo ejwayelekile ukubuzwa
1. Q: Ingasakaza Kude Kangakanani I-TV Transmitter?
A: Ingasakaza ibanga elingamamayela angama-40 - 60.
A I-TV transmitter ingadlulisela kumashaneli efrikhwensi ku-VHF, namabhendi e-UHF. Njengoba amaza omsakazo alawa maza ehamba ngendlela ayibona ngayo, angahamba ibanga elingamamayela angu-40–60 kuye ngobude besiteshi somsakazo.
2. Q: Yini Engaphazamisa Izimpawu Ze-TV?
A: Izithiyo ezizungeze isidlulisi se-TV zingaphazamisa ikhwalithi yamasignali e-TV.
Ngokuvamile, izithiyo yilezo eziphakathi kwemibhoshongo yangakini yokusakaza kanye ne-Over-the-Air TV yakho engaphazamisa amasiginali we-TV, okuhlanganisa izihlahla, izintaba nezigodi, izakhiwo ezinkulu, njalo njalo.
3. Q: Asakazwa Kanjani Izimpawu Ze-TV?
A: Asakazwa ngendlela yamaza omsakazo emoyeni.
Isignali ye-TV ithwalwa ngekhebula iye ku-antenna, evame ukuba entabeni ephakeme noma esakhiweni. Izimpawu zisakazwa emoyeni njengamaza omsakazo. Bangakwazi ukuhamba emoyeni ngesivinini sokukhanya.
4. Q: Liyini i-Frequency Band ye-TV Transmitter?
A: Ingasakaza kumabhendi e-VHF ne-UHF.
A I-TV transmitter ingadlulisela ngamabhendi e-VHF kanye ne-UHF. Okulandelayo yibhendi yefrikhwensi ngokuningiliziwe:
- 54 kuya ku-88 MHz kumashaneli 2 kuya ku-6
- 174 kuya ku-216 MHz iziteshi 7 kuya ku-13
- 470 kuya ku-890 MHz kumashaneli e-UHF 14 kuya ku-83
Isiphetho
Uma sikhuluma ngakho, siyazi ukuthi ama-TV e-analog nama-TV edijithali angahlangabezana nezidingo ezahlukene. Ingabe udinga ukuthenga ama-transmitter we-TV? U-FMUSER ungumhlinzeki onokwethenjelwa wezinto zokusakaza zomsakazo nezixazululo, ezingakunikeza i qedela iphakheji yesidluliseli se-TV kufaka phakathi ama-TV e-analog&digital TV athengiswayo, ama-antenna e-TV afanayo ayathengiswa. Ngiyacela xhumana ne-FMUSER. Silwela ukwenza amakhasimende ethu azizwe ezwakala futhi eqonda.
Funda futhi
