Kufambira mberi kuri kufambira mberi pasi rose, asi, zvinosuruvarisa, kwete nekukurumidza sezvatinoda. Nokudaro, pari zvino, mamiriyoni eterevhizheni haakwanisi kugamuchira chiratidzo chedhijitari pasina madondoro, uye mupi ane hanya nekureruka kwemunyoreri anofanira kupa chiratidzo cheTV, kusanganisira mune fomu yeanalog.
Zviri mukati mechikamu chechinyorwa
- Chikamu 3: Analog chikamu chechiratidzo
- Chikamu 4: Digital chikamu chechiratidzo
- Chikamu 5: Coaxial Distribution Network
- Chikamu 6: RF Amplifiers
- Chikamu 7: Optical Receivers
- Chikamu 8: Optical backbone network
- Chikamu 9: Musoro
- Chikamu 10: Troubleshooting pamusoro tambo TV network
Hurongwa hwehurumende hwekudzima kutepfenyura kweanalogue kwezviteshi zveTV
Kunyangwe izvi zvisingaenderane zvizere nemusoro wenyaya, hazvigoneke kufuratira nyaya iri kutsva izvozvi.
Saka: nhaurirano dzese idzi dzine chekuita nekutepfenyura chete. Ndiko kuti, chiratidzo chinofamba nemhepo kubva pashongwe yeTV iri pedyo. Nyika chete ndiyo inokonzera chiratidzo ichi muRussia, uye maviri chete (mune mamwe matunhu matatu) akawanda acharamba ari mairi. Iyo analog chikamu chekutepfenyura kwetambo chinoenderana chete nevanopa uye kazhinji haizoendi. Saka kana TV yako isina kubatana kune antenna iri padenga remba kana windowsill, saka kubuda uku hakuzokanganisa iwe. Sei ndichiti "zvinenge" uye "zvichida"? Icho chokwadi ndechekuti vamwe vashandisi vetambo vakatozivisa kumisa kuri kuuya kwekupa masaini eanalog kune vanyoreri. Zvakaoma kunzwisisa kurudziro, nekuti sezvazviri pachena kubva kuChikamu 1 chezvinyorwa zvangu, izvi hazvigone kuunza mari yakakosha pamidziyo: makadhi mashoma ekuwedzera mune yakajairika chassis ane chekuita neizvi. Kusunungura mafambisirwo emutakuri zvakare chinhu chinokatyamadza kukurudzira: hapana chikonzero mumusika chehuwandu hwakadai hwemadhijitari chiteshi chinogona kugarwa kutsiva akaremara analogue. Nzira chete yekuita mari pano ndeyekutengesa seti-yepamusoro mabhokisi kune vanyoreri, asi isu tichasiya izvo kune hana yevashandisi.
Analog Signal Parameters
Chiratidzo cheterevhizheni yeanalogi ndiyo huwandu hwezviratidzo zvitatu: amplitude modulated kupenya uye ruvara, uye frequency modulated ruzha. Asi kuti uongorore huwandu uye hutano, zvakakwana kutora chiratidzo ichi sechinhu chimwe chete, kunyange isu tose takacherechedza kanopfuura kamwe chete kuti kunyange nemufananidzo unotyisa, inzwi rinobva kuTV rakanaka. Izvi zvinokonzerwa nekusadzivirirwa kweruzha rweFM. Kuyera analog chiratidzo paramita, iyo Deviser DS2400T mudziyo inopa inotevera modhi:
Mune iyi modhi, unogona kushandisa mabhatani kushandura analog chiteshi (madhijitari chiteshi anozosvetuka otomatiki) senge paTV. Chete pachinzvimbo chekushambadzira uye nhau tichaona chimwe chinhu chakadai:
Pairi tinogona kuona maparamendi makuru echiratidzo: iyi ndiyo nhanho mu dBµV uye chiyero chechiratidzo chechiratidzo kune ruzha (kana kuti, mutakuri / ruzha). Sezvo chiteshi pama frequency akasiyana ari pasi pezviitiko zvakasiyana panguva yekutapurirana, zvinodikanwa kutora zviyero pamatanho akati wandei (pamwe paaya maviri akanyanya mu frequency renji).
Maererano neGOST zvinodiwa, chiyero chechiratidzo pane chekuisa kune chinogamuchira chinofanira kunge chiri muhutano kubva pa60 kusvika ku80 dB. Kuti uve nechokwadi chezvinokosha izvi, mupi anofanira kupa munyoreri panzvimbo yekubatanidza (kazhinji panera yakaderera-ikozvino pakumhara) zvakanaka 70-75 dB. Icho chokwadi ndechekuti chero chinhu chinogona kuitika panzvimbo yemunyoreri: yakashata-yemhando kana yakakuvadzwa tambo, zvisizvo zvakasarudzwa dividers, TV ine hurombo hwekunzwa chikumbaridzo. Zvese izvi zvinozopedzisira zvatungamira kune masaini attenuation. Asi yakanyanyisa chiyero chechiratidzo chakashata zvakare: yakanaka TV ine dunhu rekurudyi, kusanganisira yemhando yepamusoro AGC, inogona kugadzirisa chiratidzo cheinopfuura zana dB, asi maTV mazhinji asingadhure haagone kurarama nechiratidzo chakadaro.
Mufambidzani akakosha wechero chiratidzo ruzha. Iyo inounzwa nemichina inoshanda padanho rekugadzira chiratidzo, ipapo amplifiers anoikudza pamwe nechiratidzo, uye kunyange kuwedzera zvishoma zvayo. Kune chiratidzo cheanalogi, izvi zvakakosha: zvese izvo chando, mitsetse uye kumwe kukanganisa ruzha runoda kuyerwa uye, chokwadi, zviri nani kuderedzwa. Kuti uongorore kunaka kwechiratidzo cheanalog, chiyero chechiratidzo chinobatsira kune ruzha chinoshandiswa, ndiko kuti, iyo yakakwirira kukosha, zviri nani. GOST inotsanangura kukosha kwakaderera se 43 dB; kutaura zvazviri, munyoreri anogamuchira, hongu, zvakawanda, asi nekuda kwezvikonzero zvakafanana nekudzikisira, iyi parameter inogona kuipa munzira kubva papaneru kuenda kuTV. Kunyangwe zvichitendwa kuti wiring isingagone kuunza ruzha, inogona kugamuchira kukanganiswa kubva kune tambo yemagetsi iri pedyo, semuenzaniso, kana kugamuchira chiratidzo chepasi chine simba kubva kune anodzokorora. Mukuwedzera, pasi-mhando kana vaparadzi vakwegura vanogona kuita basa ravo - izvi zvakakodzera kubhadhara.
Mukuita, iyo yekupedzisira yemhando yemufananidzo inotsamira pamwero mukuru paTV pachayo. Ehe, chiratidzo cheanalog hachina redundancy yekudzivirira ruzha, asi mafirita mumhando yepamusoro vanogamuchira, pamwe neakavakirwa-mukati amplifiers, anogona kuita zvishamiso, asi mupi, hongu, haafanire kuvimba neizvi.
Source: www.habr.com