{"id":33495,"date":"2019-10-31T21:52:52","date_gmt":"2019-10-31T18:52:52","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-4-tsifrovaya-sostavlyayushhaya-signala\/"},"modified":"2019-10-31T21:52:52","modified_gmt":"2019-10-31T18:52:52","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-4-tsifrovaya-sostavlyayushhaya-signala","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/administrirovanie\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-4-tsifrovaya-sostavlyayushhaya-signala","title":{"rendered":"Mre\u017ee kabelske televizije za najmla\u0111e. Dio 4: Digitalna komponenta signala","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Mre\u017ee kabelske televizije za najmla\u0111e. Dio 4: Digitalna komponenta signala\" src=\"\/wp-content\/uploads\/2019\/05\/9d5b75de9baed1844b204cbc3e4b653a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSvi znamo da je svijet tehnologije oko nas digitalan ili te\u017ei tome. Digitalno televizijsko emitiranje nije nova stvar, no ako se niste posebno zanimali za to, tehnologije koje ga prate mogu vas iznenaditi.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Sadr\u017eaj serije \u010dlanaka<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Dio 1: Op\u0107a arhitektura KTV mre\u017ee<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Dio 2: Sastav i oblik signala<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Dio 3: Analogna komponenta signala<\/a><\/noindex><\/li>\n<li>Dio 4: Digitalna komponenta signala<\/li>\n<li>Dio 5: Koaksijalna distribucijska mre\u017ea<\/li>\n<li>Dio 6: RF poja\u010dala<\/li>\n<li>Dio 7: Opti\u010dki prijemnici<\/li>\n<li>Dio 8: Opti\u010dka magistralna mre\u017ea<\/li>\n<li>Dio 9: Glavna stanica<\/li>\n<li>Dio 10: Pretra\u017eivanje i otklanjanje kvarova na KTV mre\u017ei<\/li>\n<\/ul>\n<h1>Sastav digitalnog televizijskog signala<\/h1>\n<p>\nDigitalni televizijski signal predstavlja transportni tok razli\u010ditih verzija MPEG (ponekad i drugih kodeka), prenesen radio signalom uz kori\u0161tenje kvadratne amplitudne modulacije QAM razli\u010ditih stupnjeva. Svakom telekomunikatoru ova bi izjava trebala biti jasna kao dan, stoga \u0107u samo navesti gif iz <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/File:QAM16_Demonstration.gif\">wikipediji<\/a><\/noindex>, koji \u0107e, nadam se, pomo\u0107i razumjeti o \u010demu se radi onima koji se jo\u0161 nisu zanimali:<\/p>\n<p><img decoding=\"async\" alt=\"Mre\u017ee kabelske televizije za najmla\u0111e. Dio 4: Digitalna komponenta signala\" src=\"\/wp-content\/uploads\/2019\/05\/283d4b7a8b196962c4cceb63489a2b10.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTakva modulacija u jednom ili drugom obliku koristi se ne samo za \"televizijski anahronizam\", ve\u0107 i za sve sustave prijenosa podataka koji su na vrhuncu tehnologije. Brzina digitalnog toka u \"antenom\" kabelu dosti\u017ee stotine megabita!<\/p>\n<h1>Parametri digitalnog signala<\/h1>\n<p>\nKoriste\u0107i ure\u0111aj Deviser DS2400T u na\u010dinu prikazivanja parametara digitalnog signala, mo\u017eemo vidjeti kako to izgleda u stvarnosti:<\/p>\n<p><img decoding=\"async\" alt=\"Mre\u017ee kabelske televizije za najmla\u0111e. Dio 4: Digitalna komponenta signala\" src=\"\/wp-content\/uploads\/2019\/05\/68b91d37fad05b2ed6e3bc707fa26113.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nU na\u0161oj mre\u017ei prisutni su signali tri standarda: DVB-T, DVB-T2 i DVB-C. Razmotrit \u0107emo ih redom.<\/p>\n<h2>DVB-T<\/h2>\n<p>\nOvaj standard nije postao glavna opcija u na\u0161oj zemlji, ustupiv\u0161i mjesto drugoj verziji, no sasvim je prikladan za kori\u0161tenje od strane operatera jer su DVB-T2 prijemnici unazad kompatibilni s prvim standardom, \u0161to zna\u010di da korisnik mo\u017ee primiti takav signal na gotovo bilo kojem digitalnom televizoru bez dodatnih prijemnika. Osim toga, standard namijenjen prijenosu kroz zrak (slovo T ozna\u010dava Terrestrial, odnosno zrak), ima toliko dobru otpornost na smetnje i redundanciju da ponekad radi tamo gdje iz razli\u010ditih razloga ne prolazi analogni signal.<\/p>\n<p><img decoding=\"async\" alt=\"Mre\u017ee kabelske televizije za najmla\u0111e. Dio 4: Digitalna komponenta signala\" src=\"\/wp-content\/uploads\/2019\/05\/d2e68060fe9e9d7220fcbda65a8d76ac.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNa ekranu ure\u0111aja mo\u017eemo vidjeti kako se gradi zvije\u017e\u0111e 64QAM (standard podupire QPSK, 16QAM, 64QAM). Vidljivo je da u stvarnim uvjetima to\u010dke nikako ne oblikuju jedan oblik, ve\u0107 dolaze s odre\u0111enim odstupanjem. To je normalno sve dok dekoder mo\u017ee odrediti kojem to\u010dno kvadratu pripada do\u0161la to\u010dka, ali \u010dak i na prikazanoj slici vide se dijelovi gdje su smje\u0161teni na granici ili blizu nje. Ovaj uzorak mo\u017ee se brzo \u201ena oko\u201c koristiti za odre\u0111ivanje kvalitete signala: pri lo\u0161em radu poja\u010dala, na primjer, to\u010dke su raspore\u0111ene nasumi\u010dno, a televizor ne mo\u017ee sastaviti sliku iz primljenih podataka: \u201epikselizira\u201d, pa \u010dak i potpuno zastaje. Dogode se slu\u010dajevi kada procesor poja\u010dala \u201ezaboravi\u201d dodati u signal jednu od komponenti (amplitudu ili fazu). U takvim slu\u010dajevima na ekranu ure\u0111aja mo\u017ee se vidjeti krug ili prsten veli\u010dine cijelog polja. Dvije to\u010dke izvan glavnog polja slu\u017ee kao referentne za prijemnik i ne sadr\u017ee informacije.<\/p>\n<p>Na lijevoj strani ekrana, ispod broja kanala, vidimo kvantitativne parametre:<\/p>\n<p>Razina signala (<b>P<\/b>) u istim dBmV, kao i za analogni signal, me\u0111utim za digitalni signal GOST propisuje ve\u0107 samo 50 dBmV na ulazu u prijemnik. Drugim rije\u010dima, na podru\u010djima s ve\u0107im slabljenjem \u201edigitalni\u201d \u0107e raditi bolje od analognog.<\/p>\n<p>Vrijednost modulacijskih gre\u0161aka (<b>MER<\/b>) pokazuje koliko je signal iskrivljen koji primamo, odnosno koliko daleko mo\u017ee biti do\u0161la to\u010dka od sredi\u0161ta kvadrata. Ovaj parametar sli\u010dan je odnosu \u201esignal\/\u0161um\u201d iz analogne sustava, normalna vrijednost za 64QAM \u2014 od 28dB. Ovdje je dobro vidljivo da zna\u010dajna odstupanja na prikazanoj slici odgovaraju kvaliteti iznad norme: u tome le\u017ei otpornost digitalnog signala na smetnje.<\/p>\n<p>Broj gre\u0161aka u primljenom signalu (<b>CBER<\/b>) \u2014 broj gre\u0161aka u signalu prije obrade bilo kojim algoritmima ispravljanja.<\/p>\n<p>Broj gre\u0161aka nakon rada Viterbijevog dekodera (<b>VBER<\/b>) \u2014 rezultat rada dekodera koji koristi vi\u0161ak informacija za ispravljanje gre\u0161aka u signalu. Oba ova parametra mjere se u 'komadima po broju primljenog'. Da bi ure\u0111aj pokazao manje od jedne gre\u0161ke na sto tisu\u0107a ili deset milijuna (kao na prikazanoj slici), treba prihvatiti tih deset milijuna bita, \u0161to na jednom kanalu traje neko vrijeme, pa se rezultat mjerenja ne pojavljuje odmah, a mo\u017ee \u010dak na po\u010detku biti lo\u0161 (E-03, primjerice), ali nakon nekoliko sekundi izbiti na odli\u010dan parametar.<\/p>\n<h2>DVB-T2<\/h2>\n<p>\nNavedeni standard digitalnog zemaljskog emitiranja koji je prihva\u0107en u Rusiji mo\u017ee se tako\u0111er prenijeti putem u\u017eeta. Oblik sazvije\u017e\u0111a na prvi pogled mo\u017ee pomalo iznenaditi:<\/p>\n<p><img decoding=\"async\" alt=\"Mre\u017ee kabelske televizije za najmla\u0111e. Dio 4: Digitalna komponenta signala\" src=\"\/wp-content\/uploads\/2019\/05\/3122eede760f4aaa34b924f34fdcd4b4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOva rotacija dodatno pove\u0107ava otpornost na smetnje jer prijemnik zna da bi sazvije\u017e\u0111e trebalo biti okrenuto pod zadanim kutom, \u0161to omogu\u0107ava filtriranje onoga \u0161to dolazi bez zaklju\u010denog pomaka. Ovdje se mo\u017ee vidjeti da su za ovaj standard norme bitovnih gre\u0161aka red veli\u010dine vi\u0161e i gre\u0161ke u signalu prije obrade ne izlaze izvan granica mjerenja, ve\u0107 \u010dine sasvim realnih 8,6 na milijun. Za njihovo ispravljanje koristi se dekoder. <b>LDPC<\/b>, stoga se parametr zove LBER.<br \/>\nZahvaljuju\u0107i pove\u0107anoj otpornosti na smetnje, ovaj standard podr\u017eava razinu modulacije 256QAM, ali trenutno se u zemaljskom emitiranju koristi samo 64QAM.<\/p>\n<h2>DVB-C<\/h2>\n<p>\nOvaj standard je izvorno stvoren za prijenos putem u\u017eeta (C \u2014 Cable) \u2014 sredine koja je mnogo stabilnija od zraka, \u0161to omogu\u0107ava kori\u0161tenje vi\u0161e razine modulacije nego DVB-T, a time i prijenos ve\u0107eg volumena informacija, bez kori\u0161tenja slo\u017eenog kodiranja.<\/p>\n<p><img decoding=\"async\" alt=\"Mre\u017ee kabelske televizije za najmla\u0111e. Dio 4: Digitalna komponenta signala\" src=\"\/wp-content\/uploads\/2019\/05\/33c27eed12c0c66e35eae343710039f2.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOvdje vidimo sazvije\u017e\u0111e 256QAM. Kvadrata je vi\u0161e, njihova veli\u010dina je manja. Vjerojatnost gre\u0161ke je pove\u0107ana, \u0161to zna\u010di da je za prijenos takvog signala potrebno pouzdanije okru\u017eenje (ili slo\u017eenije kodiranje, kao u DVB-T2). Takav signal mo\u017ee 'raskuhati' tamo gdje rade analogni i DVB-T\/T2, no tako\u0111er ima rezervu otpornosti na smetnje i algoritme za ispravljanje gre\u0161aka.<\/p>\n<p>Zbog ve\u0107e vjerojatnosti gre\u0161ke, parametr MER za 256-QAM normiran je ve\u0107 na 32 dB.<\/p>\n<p>Broj pogre\u0161nih bitova je porastao jo\u0161 jednoj razini i sada ra\u010duna jedan pogre\u0161an bit na milijardu, ali \u010dak i ako ih bude stotine milijuna (PRE-BER ~E-07-8), dekoder Reed-Solomon kori\u0161ten u ovom standardu \u0107e ispraviti sve pogre\u0161ke.<br \/>\n<br \/>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u0441\u0435 \u043c\u044b \u043f\u0440\u0435\u043a\u0440\u0430\u0441\u043d\u043e \u0437\u043d\u0430\u0435\u043c, \u0447\u0442\u043e \u043c\u0438\u0440 \u0442\u0435\u0445\u043d\u0438\u043a\u0438 \u0432\u043e\u043a\u0440\u0443\u0433 \u2014 \u0446\u0438\u0444\u0440\u043e\u0432\u043e\u0439, \u043b\u0438\u0431\u043e \u0441\u0442\u0440\u0435\u043c\u0438\u0442\u0441\u044f \u043a \u044d\u0442\u043e\u043c\u0443. \u0426\u0438\u0444\u0440\u043e\u0432\u043e\u0435 \u0442\u0435\u043b\u0435\u0432\u0435\u0449\u0430\u043d\u0438\u0435 \u2014 \u0434\u0430\u043b\u0435\u043a\u043e \u043d\u0435 \u043d\u043e\u0432\u043e\u0441\u0442\u044c, \u043e\u0434\u043d\u0430\u043a\u043e \u0435\u0441\u043b\u0438 \u0432\u044b \u043d\u0435 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043e\u0432\u0430\u043b\u0438\u0441\u044c \u044d\u0442\u0438\u043c \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e, \u0434\u043b\u044f \u0432\u0430\u0441 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u043d\u0435\u043e\u0436\u0438\u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u043f\u0440\u0438\u0441\u0443\u0449\u0438\u0435 \u0435\u043c\u0443 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438. \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 \u0444\u043e\u0440\u043c\u0430 \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 3: \u0410\u043d\u0430\u043b\u043e\u0433\u043e\u0432\u0430\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u0438\u0433\u043d\u0430\u043b\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25196,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-33495","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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