{"id":32619,"date":"2019-10-31T21:48:00","date_gmt":"2019-10-31T18:48:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-2-sostav-i-forma-signala\/"},"modified":"2019-10-31T21:48:00","modified_gmt":"2019-10-31T18:48:00","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-2-sostav-i-forma-signala","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-2-sostav-i-forma-signala","title":{"rendered":"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbeknek. 2. r\u00e9sz: A jel \u00f6sszetev\u0151i \u00e9s form\u00e1ja","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbeknek. 2. r\u00e9sz: A jel \u00f6sszetev\u0151i \u00e9s form\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/04\/7b3a15cd9dddaf07211c89457054d0cd.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA jel, amely a k\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zaton kereszt\u00fcl ker\u00fcl \u00e1tvitelre, sz\u00e9les s\u00e1v\u00fa, frekvenci\u00e1nk\u00e9nt felosztott spektrumot k\u00e9pvisel. A jel param\u00e9tereit, bele\u00e9rtve a frekvenci\u00e1kat \u00e9s a csatorn\u00e1k sz\u00e1m\u00e1t Oroszorsz\u00e1gban a GOST 7845-92 \u00e9s a GOST R 52023-2003 szab\u00e1lyozza, de a csatorn\u00e1k tartalm\u00e1t az \u00fczemeltet\u0151 saj\u00e1t bel\u00e1t\u00e1sa szerint v\u00e1laszthatja meg.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Cikk sorozat tartalma<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">1. r\u00e9sz: A KTV h\u00e1l\u00f3zat \u00e1ltal\u00e1nos architekt\u00far\u00e1ja<\/a><\/noindex><\/li>\n<li>2. r\u00e9sz: A jel \u00f6sszet\u00e9tele \u00e9s form\u00e1ja<\/li>\n<li>3. r\u00e9sz: A jel anal\u00f3g komponense<\/li>\n<li>4. r\u00e9sz: A jel digit\u00e1lis komponense<\/li>\n<li>5. r\u00e9sz: Koaxi\u00e1lis eloszt\u00f3h\u00e1l\u00f3zat<\/li>\n<li>6. r\u00e9sz: RF-jelsz\u00f3r\u00f3k<\/li>\n<li>7. r\u00e9sz: Optikai vev\u0151k<\/li>\n<li>8. r\u00e9sz: Optikai gerinch\u00e1l\u00f3zat<\/li>\n<li>9. r\u00e9sz: Fej\u00e1llom\u00e1s<\/li>\n<li>10. r\u00e9sz: Hib\u00e1k keres\u00e9se \u00e9s elh\u00e1r\u00edt\u00e1sa a KTV h\u00e1l\u00f3zaton<\/li>\n<\/ul>\n<p>Eml\u00e9keztetlek, hogy nem tank\u00f6nyvet \u00edrok, hanem egy ismeretterjeszt\u0151 anyagot, hogy b\u0151v\u00edtsem a l\u00e1t\u00f3k\u00f6r\u00f6met \u00e9s bevezet\u00e9st adjak a k\u00e1bel TV vil\u00e1g\u00e1ba. Ez\u00e9rt igyekszem egyszer\u0171 nyelven \u00edrni, megtartva a kulcsszavakat az \u00e9rdekl\u0151d\u0151k sz\u00e1m\u00e1ra, \u00e9s nem m\u00e9lyedni el a technol\u00f3gi\u00e1k le\u00edr\u00e1s\u00e1ban, amelyeket n\u00e9lk\u00fclem is sz\u00e1zszor j\u00f3l le\u00edrtak.<\/p>\n<h1>Mivel m\u00e9rj\u00fck<\/h1>\n<p>\nA koaxi\u00e1lis k\u00e1belben l\u00e9v\u0151 jel inform\u00e1ci\u00f3inak beszerz\u00e9s\u00e9hez m\u0171szaki szem\u00e9lyzet\u00fcnk f\u0151leg a Deviser DS2400T m\u0171szert haszn\u00e1lja.<br \/>\n<img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbeknek. 2. r\u00e9sz: A jel \u00f6sszetev\u0151i \u00e9s form\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/04\/16736bb28accd24fa63aba18629d83eb.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAlapvet\u0151en ez egy t\u00e9v\u00e9tuner, de a k\u00e9p \u00e9s a hang helyett mennyis\u00e9gi \u00e9s min\u0151s\u00e9gi jellemz\u0151ket l\u00e1tunk az eg\u00e9sz spektrum \u00e9s az egyes csatorn\u00e1k vonatkoz\u00e1s\u00e1ban. Az al\u00e1bbi illusztr\u00e1ci\u00f3k ezen m\u0171szer k\u00e9perny\u0151k\u00e9peit tartalmazz\u00e1k.<\/p>\n<p>Ez a Deviser m\u00e9g n\u00e9h\u00e1ny felesleges funkci\u00f3val is rendelkezik, de vannak komolyabb m\u0171szerek is: k\u00e9perny\u0151vel, amely k\u00f6zvetlen\u00fcl a t\u00e9v\u00e9k\u00e9pet mutatja, optikai jel fogad\u00e1s\u00e1val \u00e9s ami a Devisernek hi\u00e1nyzik, DVB-S m\u0171holdas jel fogad\u00e1s\u00e1val (de ez eg\u00e9szen m\u00e1s t\u00f6rt\u00e9net).<\/p>\n<h1>A jel spektruma<\/h1>\n<p>\nA jel \u00e1llapot\u00e1nak gyors szemrev\u00e9telez\u00e9s\u00e9re a spektrum megjelen\u00edt\u00e9si m\u00f3d tesz lehet\u0151v\u00e9<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbeknek. 2. r\u00e9sz: A jel \u00f6sszetev\u0151i \u00e9s form\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/04\/2b012db5798f40c20514290ed44d89e4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEbben a m\u00f3dban a m\u0171szer a csatorn\u00e1kat a megadott frekvencia-tervnek megfelel\u0151en szkenneli. A k\u00e9nyelem \u00e9rdek\u00e9ben a teljes spektrumb\u00f3l elt\u00e1vol\u00edtottuk a h\u00e1l\u00f3zatunkban nem haszn\u00e1lt frekvenci\u00e1kat, ez\u00e9rt a megjelen\u00edtett k\u00e9p egy csatornasort k\u00e9pez.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbeknek. 2. r\u00e9sz: A jel \u00f6sszetev\u0151i \u00e9s form\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/04\/f6817317f6d0918c03eedd7f5684023e.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA digit\u00e1lis csatorn\u00e1kat k\u00e9k sz\u00edn jel\u00f6li, a s\u00e1rga pedig az anal\u00f3gokat. Az anal\u00f3g csatorna z\u00f6ld r\u00e9sze a hang komponense.<\/p>\n<p>J\u00f3l \u00e9szlelhet\u0151 a k\u00fcl\u00f6nb\u00f6z\u0151 csatorn\u00e1k szintje k\u00f6z\u00f6tti k\u00fcl\u00f6nbs\u00e9g: az egyes egyenl\u0151tlens\u00e9gek a transzponder be\u00e1ll\u00edt\u00e1sait\u00f3l f\u00fcggenek a fej\u00e1llom\u00e1son, m\u00edg a fels\u0151 \u00e9s als\u00f3 frekvenci\u00e1k k\u00f6z\u00f6tti \u00e1ltal\u00e1nos elt\u00e9r\u00e9snek adott jelent\u00e9se van, amelyr\u0151l k\u00e9s\u0151bb besz\u00e9lek.<\/p>\n<p>Ebben a m\u00f3dban j\u00f3l l\u00e1that\u00f3k a norm\u00e1t\u00f3l val\u00f3 er\u0151s elt\u00e9r\u00e9sek, \u00e9s ha a h\u00e1l\u00f3zatban komoly probl\u00e9m\u00e1k vannak, az azonnal \u00e9szlelhet\u0151. P\u00e9ld\u00e1ul a bemutatott k\u00e9pen l\u00e1that\u00f3, hogy k\u00e9t digit\u00e1lis csatorna hi\u00e1nyzik a magas frekvenciatartom\u00e1nyban: ezek csak r\u00f6vid cs\u00edkok form\u00e1j\u00e1ban jelennek meg, alig el\u00e9rve a 10 dBmkV szintet (a fels\u0151 ponton a referencia szint 80 dBmkV \u2014 ez a grafikon fels\u0151 hat\u00e1ra), ami val\u00f3j\u00e1ban zaj, amelyet a k\u00e1bel antennak\u00e9nt vesz fel, vagy amelyet az akt\u00edv berendez\u00e9sek okoznak. Ezek a csatorn\u00e1k teszteltek voltak, \u00e9s a cikk \u00edr\u00e1s\u00e1nak id\u0151pontj\u00e1ban ki voltak kapcsolva.<\/p>\n<p>A digit\u00e1lis \u00e9s anal\u00f3g csatorn\u00e1k egyenetlen elhelyezked\u00e9se zavar\u00f3 lehet. Ez term\u00e9szetesen nem helyes, \u00e9s a h\u00e1l\u00f3zat evol\u00faci\u00f3s fejl\u0151d\u00e9s\u00e9nek eredm\u00e9nye: a frekvenciatervhez egyszer\u0171en tov\u00e1bbi csatorn\u00e1kat adtak a spektrum szabad r\u00e9sz\u00e9hez. Ha null\u00e1r\u00f3l alak\u00edtan\u00e1k ki a frekvenciatervet, akkor hely\u00e9nval\u00f3 lenne, ha az \u00f6sszes anal\u00f3g csatorna az als\u00f3 frekvenciatartom\u00e1nyban helyezkedne el. Ezen k\u00edv\u00fcl az eur\u00f3pai orsz\u00e1gok sz\u00e1m\u00e1ra k\u00e9sz\u00fclt jelgener\u00e1l\u00f3 \u00e1llom\u00e1sok berendez\u00e9sein\u00e9l korl\u00e1toz\u00e1sok vannak a digit\u00e1lis jel tov\u00e1bb\u00edt\u00e1s\u00e1hoz haszn\u00e1lt frekvenci\u00e1k tekintet\u00e9ben, \u00e9s b\u00e1r orsz\u00e1gunkban ilyen korl\u00e1toz\u00e1sok nincsenek, ezek haszn\u00e1lata mellett a digit\u00e1lis csatorn\u00e1kat ellentmond\u00e1sosan kell elhelyezni a spektrumban.<\/p>\n<h1>A jel form\u00e1ja<\/h1>\n<p>\nAhogy azt a fundament\u00e1lis fizik\u00e1b\u00f3l tudjuk, a hull\u00e1m frekvenci\u00e1j\u00e1nak emelked\u00e9s\u00e9vel a terjed\u00e9s sor\u00e1n egyre er\u0151sebb az elnyel\u0151d\u00e9s. Egy sz\u00e9less\u00e1v\u00fa jel, mint ami a KTV h\u00e1l\u00f3zat\u00e1ban tal\u00e1lhat\u00f3, elnyel\u0151d\u00e9se a terjeszt\u00e9si h\u00e1l\u00f3zatban ak\u00e1r t\u00edzdecil\u00e9tereken is el\u00e9rheti, mik\u00f6zben az als\u00f3 frekvenciatartom\u00e1nyban ez t\u00f6bbsz\u00f6r\u00f6sen kisebb. \u00cdgy ha a pinc\u00e9b\u0151l egy sima jelet k\u00fcld\u00fcnk a f\u0151\u00e1gra, a 25. emeleten a k\u00f6vetkez\u0151t fogjuk l\u00e1tni:<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbeknek. 2. r\u00e9sz: A jel \u00f6sszetev\u0151i \u00e9s form\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/04\/df8b02e3904023bb254de8f1dd9d7d3c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA magas frekvenci\u00e1k szintje l\u00e9nyegesen alacsonyabb, mint az alacsonyak\u00e9. Val\u00f3s helyzetben a telev\u00edzi\u00f3, an\u00e9lk\u00fcl hogy \u00e9szlelne, egyszer\u0171en zajk\u00e9nt \u00e9rt\u00e9kelheti a gyeng\u00e9bb csatorn\u00e1kat, \u00e9s kisz\u0171rheti azokat. Ha pedig a lak\u00e1sban er\u0151s\u00edt\u0151 van telep\u00edtve, akkor a fels\u0151 frekvenciatartom\u00e1nyb\u00f3l \u00e9rkez\u0151 csatorn\u00e1k min\u0151s\u00e9gi v\u00e9tel\u00e9re val\u00f3 be\u00e1ll\u00edt\u00e1s pr\u00f3b\u00e1lkoz\u00e1sakor az als\u00f3 frekvenci\u00e1kn\u00e1l t\u00faler\u0151s\u00edt\u00e9s l\u00e9phet fel. A szabv\u00e1nyok a teljes tartom\u00e1nyra vonatkoz\u00f3an legfeljebb 15 dBmkV elt\u00e9r\u00e9st \u00edrnak el\u0151.<\/p>\n<p>A magas frekvenci\u00e1s z\u00f3n\u00e1ban a magasabb szintet alapb\u00f3l be kell \u00e1ll\u00edtani az akt\u00edv eszk\u00f6z\u00f6k konfigur\u00e1l\u00e1sakor, hogy elker\u00fclj\u00fck ezt. Ezt h\u00edvj\u00e1k \u201eegyens\u00falyi d\u0151l\u00e9ssz\u00f6gnek\u201d vagy egyszer\u0171en \u201ed\u0151l\u00e9ssz\u00f6gnek\u201d. Amit a k\u00e9pen l\u00e1tunk, az a \u201eford\u00edtott d\u0151l\u00e9ssz\u00f6g\u201d, \u00e9s ez m\u00e1r hiba. Vagy legal\u00e1bbis arra utal, hogy a k\u00e1bellel a m\u00e9r\u00e9si pontig probl\u00e9ma van. <\/p>\n<p>El\u0151fordulhat ford\u00edtott helyzet is, amikor az alacsony frekvenci\u00e1k gyakorlatilag hi\u00e1nyoznak, m\u00edg a magasak alig k\u00e9pesek t\u00fall\u00e9pni a zajszinten:<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbeknek. 2. r\u00e9sz: A jel \u00f6sszetev\u0151i \u00e9s form\u00e1ja\" src=\"\/wp-content\/uploads\/2019\/04\/a69fd310c5115b09f4cdf6d209e04fef.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEz szint\u00e9n a k\u00e1bel, pontosabban annak k\u00f6z\u00e9ps\u0151 vezet\u00e9k\u00e9nek k\u00e1rosod\u00e1s\u00e1r\u00f3l \u00e1rulkodik: min\u00e9l magasabb a frekvencia, ann\u00e1l k\u00f6zelebb terjed a hull\u00e1mvezet\u0151 sz\u00e9l\u00e9hez (b\u0151rhat\u00e1s a koaxi\u00e1lis k\u00e1belben). Ez\u00e9rt csak azokat a csatorn\u00e1kat l\u00e1tjuk, amelyek a magas frekvenci\u00e1j\u00faak, de \u00e1ltal\u00e1ban a t\u00e9v\u00e9 m\u00e1r nem tudja fogadni \u0151ket ilyen szinten.<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0438\u0433\u043d\u0430\u043b, \u043f\u0435\u0440\u0435\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0439 \u043f\u043e \u0441\u0435\u0442\u0438 \u043a\u0430\u0431\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0442\u0435\u043b\u0435\u0432\u0438\u0434\u0435\u043d\u0438\u044f \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0438\u0437 \u0441\u0435\u0431\u044f \u0448\u0438\u0440\u043e\u043a\u043e\u043f\u043e\u043b\u043e\u0441\u043d\u044b\u0439, \u0447\u0430\u0441\u0442\u043e\u0442\u043d\u043e \u0440\u0430\u0437\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0439 \u0441\u043f\u0435\u043a\u0442\u0440. \u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u0441\u0438\u0433\u043d\u0430\u043b\u0430, \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0447\u0430\u0441\u0442\u043e\u0442\u044b \u0438 \u043d\u043e\u043c\u0435\u0440\u0430 \u043a\u0430\u043d\u0430\u043b\u043e\u0432 \u0432 \u0420\u043e\u0441\u0441\u0438\u0438 \u0440\u0435\u0433\u043b\u0430\u043c\u0435\u043d\u0442\u0438\u0440\u0443\u044e\u0442\u0441\u044f \u0413\u041e\u0421\u0422 7845-92 \u0438 \u0413\u041e\u0421\u0422 \u0420 52023-2003, \u043d\u043e \u043d\u0430\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u0438\u0437 \u043a\u0430\u043d\u0430\u043b\u043e\u0432 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 \u0432\u043e\u043b\u0435\u043d \u0432\u044b\u0431\u0438\u0440\u0430\u0442\u044c \u043d\u0430 \u0441\u0432\u043e\u0451 \u0443\u0441\u043c\u043e\u0442\u0440\u0435\u043d\u0438\u0435. \u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u0427\u0430\u0441\u0442\u044c 1: \u041e\u0431\u0449\u0430\u044f \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0430 \u0441\u0435\u0442\u0438 \u041a\u0422\u0412 \u0427\u0430\u0441\u0442\u044c 2: \u0421\u043e\u0441\u0442\u0430\u0432 \u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":24410,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-32619","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" 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