TV yog hloov mus tas li. Tam sim no, rau qhov yooj yim ntawm cov neeg siv, ntau yam qauv tau tsim. Ib qho nrov tshaj plaws yog hom DVB-C. TV yog dab tsi?
Cov qauv TV tseem ceeb yog raws li hauv qab no:
- DVB yog lub ntsiab TV digital hauv Tebchaws Europe;
- ISDB - faib hauv Nyiv;
- ATSC - hauv Asmeskas;
- DVB-C yog tus qauv xov tooj cua tseem ceeb.
DVB-C standard
Dab tsi hauv TV? Txhawm rau pib ua haujlwm nrog tus qauv no, koj yuav tsum tau ntxig ib daim npav uas muab los ntawm koj tus kws kho mob rau hauv qhov tshwj xeeb ntawm lub tuner. Hom ntawv no yog ua raws li cov coding ntawm cov duab hloov, thiab nws kuj muaj suab hauv MPEG-2 hom ntawv. Lub DVB-C receiver tsuas yog ua haujlwm nrog kev sib txuas ntawm cable. Hauv lwm lo lus, nws yog ib qho tsim nyog hu rau tus tswv los nqa tawmkab. Qhov kev xav tau rau nws yog ib qho tseem ceeb tshaj plaws ntawm qhov tsis zoo ntawm cov qauv no, vim tias nws tsis tuaj yeem khiav lub cable rau hauv qee lub tsev, uas txhais tau hais tias nws tsis tuaj yeem siv tus qauv DVB-C TV. Nws yog dab tsi hauv TV, nws txawv ntawm lwm cov qauv li cas?
Ntawm TV technologies
Ntau lub TV tshaj tawm niaj hnub no muaj kev txhawb nqa DVB-C. Dab tsi hauv TV? Cov khoom siv hauv qhov no txhais tau tias tsis yog TVs nkaus xwb, tab sis kuj tseem muaj ntau lub receivers, set-top boxes thiab tuners. Muaj ntau qhov laj thawj rau qhov no:
- Cov khoom siv feem ntau txuas rau cable yam tsis muaj teeb meem;
- muaj ntau ntau txoj kev xaiv rau DVB-C txuas;
- nqi txuas yog pheej yig;
- yooj yim los txhim kho qhov zoo ntawm cov duab tshwm sim;
- nws yooj yim los muab koj lub TV nrog kev txhawb nqa mpeg.
Cov thawv teeb tsa niaj hnub feem ntau txhawb nqa DVB-C, vim tias nws yooj yim dua thiab muaj txiaj ntsig ntau rau cov neeg muab kev pabcuam los teeb tsa hom kev tshaj tawm no.
Vim qhov no, qhov kev thov rau cov khoom siv nrog DVB-C kev txhawb nqa tau loj hlob. Cov chaw tsim khoom nrhiav kom yeej qhov kev nyiam ntawm cov neeg siv khoom los ntawm kev muab lawv lub sijhawm los yuav khoom siv nrog kev txhawb nqa rau DVB-C thiab mpeg4.
DVB-C yog qhov nrov tshaj plaws hauv nroog. Qhov no yog vim lub fact tias cable TV kev twb kev txuas yog pheej yig, tsissiv sijhawm ntau thiab feem ntau tuaj yeem txuas tau los ntawm tib tus kws kho mob uas muab rau tus neeg siv nrog Is Taws Nem.
A variation of DVB-C2 standard
Nov yog tiam thib ob ntawm tus qauv saum toj no. Nws txawv ntawm thawj tus nyob rau hauv uas thaum nws txuas nrog, pheej yig dua technologies yog siv, tab sis tsis inferior nyob rau hauv zoo rau lawv predecessors. Ib tus neeg nqa khoom tau hloov pauv los ntawm OFDM thev naus laus zis. Nws ua rau TV yooj yim dua thiab tiv thaiv kev cuam tshuam.
DVB-S
Qhov txawv ntawm tus qauv no yog kev sib txuas lus yog los ntawm satellite. Ntawd yog, TV tsis xav tau cable, tab sis kav hlau txais xov thiab receiver. Txoj kev tshaj tawm no yog qhov ceev tshaj plaws ntawm txhua qhov tau piav qhia, thiab tseem muab cov duab zoo thiab lub suab. Yog tias koj nruab ib lub combo HD receiver nrog ob lub tuners rau DVB-S2, koj yuav tau txais cov duab zoo uas koj feem ntau pom hauv cov yeeb yaj kiab hauv koj lub tsev.
Yuav ua li cas txuas DVB-C
Yog tias koj muaj TV niaj hnub, ces, feem ntau yuav, DVB-C kev txhawb nqa twb tau tsim rau hauv nws thiab muaj CAM module. Tom qab ntawd koj tsuas yog yuav tsum yuav ib qho module thiab daim npav nkag los ntawm tus kws kho mob, thiab tom qab ntawd txuas txhua yam rau koj lub cuab yeej.
Yog tias koj tus qauv tsis txhawb DVB-C, ces koj yuav tsum tau yuav lub tuner nrog cov thev naus laus zis no. Tam sim no muaj ntau ntawm lawv, yog li nws yuav tsis siv sijhawm ntev los tshawb nrhiav.
Yog tias koj muaj DVB-C cable TV txais thiab nyeem daim npav tshwj xeeb, koj tuaj yeem txaus siab rau hom kev tshaj tawm no txawm tias los ntawm kojtus kheej lub computer. Koj tsuas yog yuav tsum tau them nyiaj rau qhov kev tso npe, uas yog tus nqi pheej yig raws li tus lej ntawm cov channel koj tau txais rov qab.
DVB-C thev naus laus zis yog qhov txaus siab rau cov neeg siv uas twb muaj cable TV ntawm lawv qhov chaw pov tseg, tab sis tsuas yog hauv hom analog. Nyob rau hauv rooj plaub no, koj tsis tas yuav hu rau lub installation wizard.
Ntau tus neeg muab kev pabcuam muab kev txo nqi loj rau kev sib txuas cov kev tshaj tawm no, vim tias cov txheej txheem tsis xav tau cov nqi tshwj xeeb, thiab thev naus laus zis nws tus kheej yog qhov xav tau ntawm cov neeg siv khoom. Yog hais tias koj twb muaj cable TV, ces koj yuav tsum tham nrog koj tus neeg teb xov tooj hais txog kev txuas DVB-C digital tariffs.
Ntau lub TV LED niaj hnub nrog DVB-C T2 muaj cov khoom sib txuas tshwj xeeb uas ua kom yooj yim rau txoj kev sib txuas cov hom vim qhov tseeb tias cov cable tuaj yeem txuas ncaj qha mus rau lub cuab yeej yam tsis tas siv cov tuners ntxiv thiab cov thawv teeb tsa.
Thaum txuas lub cable rau TV, txhua yam uas tseem tshuav yog teeb tsa kev tshaj tawm, thiab qhov no yog txoj haujlwm yooj yim thiab ceev heev.
Ntawm qhov nruab nrab, thaum koj txuas rau TV tshaj tawm hauv DVB-C hom, koj tau txais ntau tshaj li ib puas qhov sib txawv, ntawm txhua tus neeg yuav pom qee yam nthuav rau lawv tus kheej. Cov cuab yeej tuaj yeem ua kom cov peev txheej tau muab thaum rov tshaj tawm rau lwm zaus, tab sis qhov no tsuas yog ua tau nrog kev tso cai los ntawm tus kws kho mob, vim nws tswj cov ntsiab lus muab rau cov neeg siv.
Yuav txuas li cas?
Yog tias koj twb tau qhib lub DVB-C tuner rau koj lub TV thiab ua tiav tag nrho lwm qhov chaw, koj tuaj yeem pib nrhiav cov channel. Txhawm rau ua qhov no, koj yuav tsum qhib cov ntawv qhia zaub mov thiab nrhiav "Channel nqis" muaj nuj nqi. Lub npe ntawm qhov kev xaiv yuav txawv rau cov qauv TV sib txawv.
Tom ntej no, cov ntawv qhia zaub mov "Tshawb nrhiav cov channel", ua raws li "Tsis siv neeg tshawb nrhiav". Khiav ib qho kev tshawb nrhiav tsis siv neeg channel thiab chav tsev yuav pom txhua yam muaj nyob hauv cheeb tsam. Nws yooj yim heev los txuas thiab teeb tsa koj lub TV digital thiab txaus siab rau koj cov yeeb yaj kiab thiab TV yeeb yaj kiab.
Yuav tshuaj xyuas dab tsi?
DVB-C digital cable TV hom muab cov duab thiab suab zoo. Nws ruaj khov dua thiab tsis tshua muaj kev cuam tshuam ntau dua li analog. Tsis tas li qhov txiaj ntsig loj yog qhov muaj kev sib txuas. Qhov xwm txheej tseem ceeb yog qhov muaj nyob hauv koj lub tsev ntawm tus kws kho mob uas muab kev pabcuam cable TV thiab Internet thiab cable.
Digital signal kis tau tus mob ntawm cable muaj ntau qhov zoo dua satellite - tsis muaj "dawb", suab nrov thiab cod. Thiab MPEG-2, MPEG-4 encoding thiab compression qauv rau video thiab audio cov ntaub ntawv ua rau nws muaj peev xwm tshaj tawm HD thiab SD hom.
Yuav kom tau txais cov khoom lag luam TV zoo, koj tsuas yog xav tau hu rau koj tus kws kho mob thiab txuas mus rau qhov kev pabcuam xa cov ntaub ntawv digital. Tom ntej no, nruab thiab txuas lub DVB TV tuner. Kev tshuaj xyuas hais tias tag nrho cov channel ua haujlwm zoo thiabtsis muaj kev cuam tshuam.
Nws tseem tuaj yeem saib TV digital ntawm koj lub computer. Qhov no yuav tsum muaj DVB-C tuner thiab ib daim npav nyeem ntawv rau daim npav nkag mus. Hmoov tsis zoo, kev xaiv ntawm TV digital nrog DVB-C tuner tsis muaj rau cov tswv ntawm TV kav hlau txais xov.
Rau qhov kev daws teeb meem niaj hnub hauv TV, cov ntaub ntawv hloov pauv tsis pub dhau 15 Mbps, thiab rau hom ntawv digital nws yog ob peb zaug ntxiv - los ntawm 60 txog 80 Mbps. Yog tias koj saib tag nrho DVB-C digital cable receivers hauv khw muag khoom feem ntau nrog cov nqi thiab kev tshuaj xyuas txog lawv, cov cuab yeej no zoo li ntxim nyiam dua. Tus nqi ntawm cov khoom siv no pib los ntawm ib txhiab rubles, thiab cov yam ntxwv muab tau zoo heev.
Kev tsis haum ntawm tus qauv
Ntawm qhov minuses ntawm txoj kev tau txais lub teeb liab, ib tus tuaj yeem tawm ib qho kev sib txuas them nyiaj thiab qhov xav tau rau cable TV. Tab sis yog tias koj lub tsev muaj ib qho, ces koj muaj sijhawm los ua ib tug tswv cuab ntawm qhov kev tshaj tawm xov xwm digital, tsuas yog tsis tawm hauv koj lub tsev, thiab saib cov khoom hauv TV hauv cov duab thiab suab zoo.
Qhov txawv ntawm DVB-T thiab DVB-C
Qhov sib txawv ntawm ntau hom DVB tus qauv twb tau tham saum toj no. Yog tias koj tsis muaj kev nkag mus rau cable, koj tuaj yeem siv DVB-S txuas. Ntxiv mus, niaj hnub LG TVs nrog DVB-C S2 muaj muag rau hnub no. Tab sis nws puas tuaj yeem muab piv rau hom digital?
Tus qauv DVB-T lav zoo siab txais lub teeb liab. Nws muaj peev xwm tsis perceive reflectedteeb liab. Txhawm rau txhawm rau tiv thaiv ntau yam cuam tshuam, channel coding yog siv. Cov qauv no ua raws nraim tib yam kev tshaj tawm raws li nyob rau hauv cov ntaub ntawv ntawm analog TV, tab sis cov qauv kev sib kis thiab cov thev naus laus zis sib txawv. Terrestrial DVB-T yog txawv kiag li los ntawm satellite DVB-S los yog cable DVB-C. Cov decoders muaj qhov sib txawv kiag li thiab cov kev hloov kho, yog li lawv tsis sib haum nrog ib leeg.
Digital TV tau tshaj tawm hauv decimeter spectrum. Yog li ntawd, qhov zoo ntawm cov teeb liab txais tau cuam tshuam los ntawm cov cim qhia xws li: kev nyem ntawm thaj chaw, qhov qhib qhov chaw rau lub transmitter thiab compactness ntawm lub tsev.
Dab tsi yog qhov zoo ntawm TV digital:
- yeeb yaj kiab zoo, saib lub vijtsam loj.
- Zoo suab zoo.
- xaiv ntau channel.
- Txuas kev tswj xyuas niam txiv.
Ntau yam ntawm txhua yam
Qhov txiaj ntsig tseem ceeb uas cov hom ntawv no muaj yog cov yees duab zoo. Koj tuaj yeem hnov qab txog cov teeb meem ntawm lub vijtsam. Nrog rau cov TV digital, koj yuav tsis ntsib cov teebmeem xws li kev faib cov duab, lub vijtsam snowy, thiab lwm yam. Tag nrho cov teebmeem no tsuas yog muaj nrog cov tsis zoo analog teeb liab. Cov digital, ntawm qhov tod tes, yog teem rau hauv txoj kev no: txawm tias lub teeb liab tau txais zoo, lossis tsis tau txais txhua.
Muaj ntau qhov xwm txheej uas tshaj tawm hauv lub tso suab tsis yog mono. Qhov no txhais tau hais tias muaj ntau qhov nthuav dav thiab sib cais ntawm lub suab. Tus qauv DVB tsis distort lossis compress suab. Kev siv cov ntaub ntawv ceev ceev ua rau nws tuaj yeem txuag tsheb tsis muaj kev txo qis.
Cov thev naus laus zis no tso cai rau koj kom xa cov suab nrov, uas tau muab faib ua qee qhov ntawm cov channel. DVB hom tuaj yeem siv los ntawm cov tswv tsev ua yeeb yam.
Muaj lwm qhov txiaj ntsig rau kev siv TV digital. Nws txhawb nqa ntau cov channel. Analog subscribers tsis muaj ntau haiv neeg nyob rau hauv kev coj los yog nyob rau hauv cov ntsiab lus. Koj yuav muaj kev nkag mus rau cov xov xwm, kev kawm, kev tshawb fawb, suab paj nruag, kis las thiab lwm yam ntawm cov channel ntawm koj tus kheej txiav txim siab. Txhua yam nyob ntawm koj tus kheej nyiam.
Tus qauv DVB muaj kev tswj xyuas kev sib txuas ntawm niam txiv. Nws tso cai rau koj xaiv raws nraim txoj kev tshaj tawm no. Koj tuaj yeem thaiv kev nkag mus rau qee cov channel uas koj tsis xav kom koj cov menyuam pom los ntawm kev tso tus password tshwj xeeb rau lawv. Tom qab ntawd tsis muaj leej twg tab sis koj tuaj yeem tig rau lawv.
Txoj kev no kuj muaj qhov tsis zoo. Txhawm rau siv DVB kom tiav, koj yuav tsum ua kom tiav cov xwm txheej hauv qab no:
- Nrhiav tus kws kho mob ruaj ntseg.
- Ua kom cov cuab yeej ua haujlwm.
- Ua txhua qhov chaw ua tib zoo thiab raug.
Thaum xub pom nws yuav zoo li yooj yim. Tab sis nyob rau hauv cov ntaub ntawv ntawm cov khoom siv tsis ntseeg, hom ntawv no yuav ua rau koj tsis yooj yim heev. Nws tuaj yeem raug puas tsuaj thaum cua daj cua dub, thiab koj tuaj yeem tso tseg yam tsis muaj TV. Txhawm rau txheeb xyuas tus kws kho mob zoo, koj yuav tsum kawm cov kev tshuaj xyuas ntawm txhua yam muajhauv koj tsev. Tsis tas li ntawd, koj yuav tsum tau yuav qhov tseeb LG TV nrog DVB-C T2.
Qhov tsis muaj 24/7 kev txhawb nqa los ntawm cov neeg muab kev pabcuam feem ntau kuj yog ib qho tsis zoo. Piv txwv li, vim muaj cua daj cua dub thaum tsaus ntuj, cov khoom siv ntawm lub ru tsev ntawm lub tsev tsis raug txiav txim. Txawm hais tias nws tuaj yeem rov ua haujlwm sai sai, koj yuav tsis tuaj yeem hu rau tus kws tshaj lij thaum hmo ntuj lossis hnub so.
