Kupita patsogolo kukupita patsogolo padziko lonse lapansi, koma, mwatsoka, osati mwachangu momwe timafunira. Choncho, pakali pano, mamiliyoni ambiri a televizioni sangathe kulandira chizindikiro cha digito popanda ndodo, ndipo wothandizira amene amasamala za ubwino wa olembetsa ayenera kupereka chizindikiro cha TV komanso mawonekedwe a analogi.
Zamkatimu zankhani
- Gawo 3: Chigawo cha analogi cha chizindikiro
- Gawo 4: Digital gawo la chizindikiro
- Gawo 5: Coaxial Distribution Network
- Gawo 6: RF Amplifiers
- Gawo 7: Optical Receivers
- Gawo 8: Optical backbone network
- Gawo 9: Mutu
- Gawo 10: Troubleshooting pa chingwe TV maukonde
Boma likufuna kuzimitsa kuwulutsa kwa analogi kwa ma TV
Ngakhale izi sizikugwirizana kwathunthu ndi mutuwo, ndizosatheka kunyalanyaza nkhani yoyaka motoyi tsopano.
Choncho: zokambirana zonsezi zikukhudzana ndi kuwulutsa. Ndiko kuti, chizindikiro chomwe chimayenda mumlengalenga kuchokera ku nsanja yapafupi ya TV. Ndi boma lokha lomwe limayang'anira chizindikirochi ku Russia, ndipo ma multiplexes awiri okha (m'madera ena atatu) adzakhala mmenemo. Chigawo cha analogi cha kuwulutsa kwa chingwe chimadalira okhawo omwe amapereka ndipo mwina sichingachoke. Chifukwa chake ngati TV yanu sinalumikizidwe ndi mlongoti womwe uli padenga la nyumba kapena pawindo, ndiye kuti kuzimitsa kumeneku sikudzakukhudzani. Chifukwa chiyani ndikunena kuti "pafupifupi" komanso "mwachangu"? Chowonadi ndi chakuti ena ogwiritsa ntchito zingwe adalengeza kale kutha kwapang'onopang'ono kupereka ma analogi kwa olembetsa. Ndizovuta kumvetsetsa zomwe zimakulimbikitsani, chifukwa monga zikuwonekera mu Gawo 1 lazolemba zanga, izi sizingabweretse ndalama zambiri pazida: makhadi okulirapo ochepa okha mu chassis wamba ndi omwe amachititsa izi. Kumasula ma frequency onyamula ndinso chilimbikitso chokayikitsa: palibe chifukwa pamsika chanjira zingapo zama digito zomwe zitha kukhazikitsidwa kuti zilowe m'malo mwa analogi olumala. Njira yokhayo yopangira ndalama pano ndikugulitsa mabokosi apamwamba kwa olembetsa, koma tisiya izi ku chikumbumtima cha ogwiritsa ntchito.
Zizindikiro za Analogi
Chizindikiro cha kanema wawayilesi wa analogi ndi kuchuluka kwa zizindikiro zitatu: matalikidwe osinthika owala ndi mtundu, ndi mawu osinthika pafupipafupi. Koma kuti tiwone kuchuluka kwake ndi mtundu wake, ndikwanira kutenga chizindikiro ichi ngati chiwombankhanga, ngakhale kuti tonse takhala tikuwona kangapo kuti ngakhale ndi chithunzi chowopsya, phokoso lochokera pa TV ndi labwino. Izi ndichifukwa cha chitetezo chabwino cha phokoso cha FM. Kuyeza magawo a chizindikiro cha analogi, chipangizo cha Deviser DS2400T chimapereka motere:
Munjira iyi, mutha kugwiritsa ntchito mabataniwo kusintha masitayilo a analogi (matchanelo a digito adzalumphidwa) ngati pa TV. Pokhapokha m'malo motsatsa ndi nkhani tiwona chonchi:
Pa izo tikhoza kuwona magawo akuluakulu a chizindikiro: ichi ndi mlingo mu dBΒ΅V ndi chiΕ΅erengero cha mlingo wa chizindikiro ku phokoso (kapena m'malo, chonyamulira / phokoso). Popeza ma tchanelo ama frequency osiyanasiyana amakumana ndi zochitika zosiyanasiyana panthawi yopatsirana, ndikofunikira kuyeza pamayendedwe angapo (ochepera pamitundu iwiri yopitilira muyeso).
Mogwirizana ndi zofunikira za GOST, mulingo wazizindikiro pazolowera kwa wolandila uyenera kukhala pakati pa 60 mpaka 80 dB. Kuti atsimikizire izi, woperekayo ayenera kupereka wolembetsa pamalo olumikizirana (nthawi zambiri gulu lotsika lotsika pakutera) moyenera 70-75 dB. Chowonadi ndi chakuti chilichonse chikhoza kuchitika pamalo a olembetsa: chingwe chosawoneka bwino kapena chowonongeka, zogawa zosankhidwa molakwika, TV yokhala ndi vuto losamva bwino. Zonsezi zidzapangitsa kuti ma sign achepetse. Koma chizindikiro chapamwamba kwambiri chimakhalanso choyipa: TV yabwino yokhala ndi zozungulira zolondola, kuphatikiza AGC yapamwamba kwambiri, imatha kukonza ma siginecha opitilira 100 dB, koma ma TV otsika mtengo kwambiri sangathe kuthana ndi chizindikirocho.
Mnzake wofunikira wa chizindikiro chilichonse ndi phokoso. Imayambitsidwa ndi zida zogwira ntchito pagawo la mapangidwe azizindikiro, kenako amplifiers amakulitsa limodzi ndi chizindikirocho, ndipo ngakhale kuwonjezera pang'ono zawo. Kwa chizindikiro cha analogi, izi ndizofunikira kwambiri: chipale chofewa chonsecho, mikwingwirima ndi kupotoza kwina ndi phokoso lomwe liyenera kuyesedwa ndipo, ndithudi, makamaka kuchepetsedwa. Kuti muwone mtundu wa chizindikiro cha analogi, chiΕ΅erengero cha chizindikiro chothandiza ku phokoso chimagwiritsidwa ntchito, ndiko kuti, mtengo wapamwamba, ndi wabwino. GOST imatanthawuza mtengo wocheperako ngati 43 dB; Ndipotu, wolembetsa amalandira, ndithudi, zambiri, koma pazifukwa zomwezo monga kuchepa, chizindikiro ichi chikhoza kuipiraipira panjira kuchokera pagulu kupita ku TV. Ngakhale akukhulupirira kuti mawaya opanda phokoso sangathe kuyambitsa phokoso, amatha kusokonezedwa ndi chingwe chamagetsi chapafupi, mwachitsanzo, kapena kulandira chizindikiro champhamvu chapadziko lapansi kuchokera kwa wobwereza. Kuphatikiza apo, ogawa otsika kapena okalamba amatha kugwira ntchito yawo - izi ndizofunikira kuziganizira.
M'zochita, chithunzi chomaliza chimadalira kwambiri pa TV yokha. Zoonadi, chizindikiro cha analogi sichikhala ndi redundancy pofuna kuteteza phokoso, koma zosefera muzolandira zapamwamba, komanso zopangira zopangira, zimatha kugwira ntchito zodabwitsa, koma wopereka, ndithudi, sayenera kudalira izi.
Source: www.habr.com