{"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\/hu\/blog\/administrirovanie\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-4-tsifrovaya-sostavlyayushhaya-signala","title":{"rendered":"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbek sz\u00e1m\u00e1ra. 4. r\u00e9sz: A jel digit\u00e1lis \u00f6sszetev\u0151je","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbek sz\u00e1m\u00e1ra. 4. r\u00e9sz: A jel digit\u00e1lis \u00f6sszetev\u0151je\" src=\"\/wp-content\/uploads\/2019\/05\/9d5b75de9baed1844b204cbc3e4b653a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMindannyian tudjuk, hogy a technikai vil\u00e1g digit\u00e1lis, vagy arra t\u00f6rekszik. A digit\u00e1lis telev\u00edzi\u00f3z\u00e1s m\u00e1r r\u00e9gen l\u00e9tezik, azonban ha nem \u00e9rdekl\u0151dt\u00e9l k\u00fcl\u00f6n\u00f6sebben ir\u00e1nta, meglep\u0151 lehet sz\u00e1modra a hozz\u00e1 kapcsol\u00f3d\u00f3 technol\u00f3gia.<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><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">2. r\u00e9sz: A jel \u00f6sszet\u00e9tele \u00e9s form\u00e1ja<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">3. r\u00e9sz: A jel anal\u00f3g komponense<\/a><\/noindex><\/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<h1>A digit\u00e1lis telev\u00edzi\u00f3s jel \u00f6sszetev\u0151i<\/h1>\n<p>\nA digit\u00e1lis telev\u00edzi\u00f3s jel k\u00fcl\u00f6nb\u00f6z\u0151 MPEG verzi\u00f3k (n\u00e9ha m\u00e1s kodekek) sz\u00e1ll\u00edt\u00f3folyama, amely r\u00e1di\u00f3jelk\u00e9nt ker\u00fcl tov\u00e1bb\u00edt\u00e1sra, k\u00fcl\u00f6nb\u00f6z\u0151 fok\u00fa n\u00e9gyzetamplit\u00fad\u00f3 modul\u00e1ci\u00f3 (QAM) alkalmaz\u00e1s\u00e1val. E kifejez\u00e9sek b\u00e1rmelyik kommunik\u00e1ci\u00f3s szakember sz\u00e1m\u00e1ra tiszt\u00e1k kell legyenek, ez\u00e9rt csak egy gif-et hozok, ami rem\u00e9lhet\u0151leg \u00e9rthet\u0151v\u00e9 teszi ezt azok sz\u00e1m\u00e1ra, akik m\u00e9g nem \u00e9rdekl\u0151dtek ir\u00e1nta: <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/File:QAM16_Demonstration.gif\">a Wikip\u00e9di\u00e1ban<\/a><\/noindex>, amely rem\u00e9lem, meg\u00e9rt\u00e9st ny\u00fajt arr\u00f3l, hogy ez mi is, azok sz\u00e1m\u00e1ra, akik m\u00e9g nem \u00e9rdekl\u0151dtek ir\u00e1nta:<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbek sz\u00e1m\u00e1ra. 4. r\u00e9sz: A jel digit\u00e1lis \u00f6sszetev\u0151je\" src=\"\/wp-content\/uploads\/2019\/05\/283d4b7a8b196962c4cceb63489a2b10.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEz a modul\u00e1ci\u00f3 valamilyen form\u00e1ban nemcsak a \u201et\u00e9v\u00e9id\u0151z\u00edt\u00e9shez\u201d, hanem a legmodernebb adat\u00e1tviteli rendszerekhez is haszn\u00e1lhat\u00f3. A digit\u00e1lis \u00e1raml\u00e1s sebess\u00e9ge az \u201eantenna\u201d k\u00e1belen t\u00f6bb sz\u00e1z megabit!<\/p>\n<h1>A digit\u00e1lis jel param\u00e9terei<\/h1>\n<p>\nA Deviser DS2400T eszk\u00f6z haszn\u00e1lat\u00e1val a digit\u00e1lis jelszab\u00e1lyok megjelen\u00edt\u00e9s\u00e9re, l\u00e1thatjuk, hogyan n\u00e9z ez ki a val\u00f3s\u00e1gban:<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbek sz\u00e1m\u00e1ra. 4. r\u00e9sz: A jel digit\u00e1lis \u00f6sszetev\u0151je\" src=\"\/wp-content\/uploads\/2019\/05\/68b91d37fad05b2ed6e3bc707fa26113.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nH\u00e1l\u00f3zatunkban h\u00e1rom szabv\u00e1ny\u00fa jel tal\u00e1lhat\u00f3: ezek a DVB-T, DVB-T2 \u00e9s DVB-C. N\u00e9zz\u00fck meg \u0151ket sorban.<\/p>\n<h2>DVB-T<\/h2>\n<p>\nEz a szabv\u00e1ny nem v\u00e1lt alapvet\u0151v\u00e9 haz\u00e1nkban, \u00e1tadva a hely\u00e9t a m\u00e1sodik verzi\u00f3nak, azonban az oper\u00e1tor sz\u00e1m\u00e1ra teljesen alkalmas, mert a DVB-T2 vev\u0151k h\u00e1trafel\u00e9 kompatibilisek az els\u0151 gener\u00e1ci\u00f3s szabv\u00e1nnyal, teh\u00e1t a felhaszn\u00e1l\u00f3 szinte b\u00e1rmely digit\u00e1lis telev\u00edzi\u00f3n fogadhat ilyen jelet kieg\u00e9sz\u00edt\u0151 dek\u00f3der n\u00e9lk\u00fcl. Ezen fel\u00fcl a leveg\u0151n t\u00f6rt\u00e9n\u0151 tov\u00e1bb\u00edt\u00e1sra sz\u00e1nt szabv\u00e1ny (a T bet\u0171 \u2013 a Terrestrial, azaz f\u00f6ldi) olyan j\u00f3 interferenciav\u00e9delemmel \u00e9s redundanci\u00e1val rendelkezik, hogy olykor ott is m\u0171k\u00f6dik, ahol valamilyen okb\u00f3l az anal\u00f3g jel nem \u00e9rkezik meg.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbek sz\u00e1m\u00e1ra. 4. r\u00e9sz: A jel digit\u00e1lis \u00f6sszetev\u0151je\" src=\"\/wp-content\/uploads\/2019\/05\/d2e68060fe9e9d7220fcbda65a8d76ac.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAz eszk\u00f6z k\u00e9perny\u0151j\u00e9n figyelemmel k\u00eds\u00e9rhetj\u00fck, hogyan \u00e9p\u00fcl fel a 64QAM csillagk\u00e9p (a szabv\u00e1ny t\u00e1mogatja a QPSK, 16QAM, 64QAM form\u00e1tumokat). L\u00e1that\u00f3, hogy val\u00f3di k\u00f6r\u00fclm\u00e9nyek k\u00f6z\u00f6tt a pontok egy\u00e1ltal\u00e1n nem egyes\u00fclnek, hanem bizonyos sz\u00f3r\u00e1ssal \u00e9rkeznek. Ez norm\u00e1lis, mindaddig, am\u00edg a dek\u00f3der k\u00e9pes meghat\u00e1rozni, hogy a meg\u00e9rkezett pont pontosan melyik n\u00e9gyzethez tartozik, de m\u00e9g a bemutatott k\u00e9pen is l\u00e1tszanak olyan ter\u00fcletek, ahol a pontok a hat\u00e1rvonal k\u00f6zel\u00e9ben helyezkednek el. Ebb\u0151l a k\u00e9pb\u0151l gyorsan \u201eszemre\u201d meg lehet \u00e1llap\u00edtani a jel min\u0151s\u00e9g\u00e9t: ha az er\u0151s\u00edt\u0151 rosszul m\u0171k\u00f6dik, p\u00e9ld\u00e1ul a pontok sz\u00e9tsz\u00f3rtan helyezkednek el, \u00e9s a telev\u00edzi\u00f3 nem tudja \u00f6sszeszedni a k\u00e9pet az \u00e9rkezett adatokb\u00f3l: \u201epixelez\u0151dik\u201d, vagy ak\u00e1r teljesen meg is \u00e1ll. El\u0151fordul, hogy az er\u0151s\u00edt\u0151 processzora \u201eelfelejti\u201d hozz\u00e1adni a jelhez az egyik \u00f6sszetev\u0151t (amplit\u00fad\u00f3t vagy f\u00e1zist). Ilyen esetekben az eszk\u00f6z k\u00e9perny\u0151j\u00e9n egy k\u00f6r vagy gy\u0171r\u0171 l\u00e1that\u00f3, amely az eg\u00e9sz mez\u0151 m\u00e9ret\u00e9vel egyenl\u0151. A f\u0151 mez\u0151n k\u00edv\u00fcli k\u00e9t pont hivatkoz\u00e1sk\u00e9nt szolg\u00e1l a vev\u0151 sz\u00e1m\u00e1ra, \u00e9s nem hordoz inform\u00e1ci\u00f3t.<\/p>\n<p>A k\u00e9perny\u0151 bal oldal\u00e1n, a csatorna sz\u00e1ma alatt l\u00e1thatjuk a mennyis\u00e9gi param\u00e9tereket:<\/p>\n<p>A jel szintje (<b>P<\/b>) ugyanolyan dBmV-ben van, mint az anal\u00f3g eset\u00e9ben, azonban a digit\u00e1lis jel eset\u00e9ben a GOST m\u00e1r csak 50 dBmV-t \u00edr el\u0151 a vev\u0151 bemenet\u00e9n. Teh\u00e1t azokon a ter\u00fcleteken, ahol nagyobb a csillap\u00edt\u00e1s, a \u201edigit\u00e1lis\u201d jobb lesz, mint az anal\u00f3g.<\/p>\n<p>A modul\u00e1ci\u00f3s hib\u00e1k \u00e9rt\u00e9ke (<b>MER<\/b>) megmutatja, mennyire torz\u00edtott jelet fogadunk, azaz mennyire t\u00e1vol lehet a meg\u00e9rkezett pont a n\u00e9gyzet k\u00f6zep\u00e9t\u0151l. Ez a param\u00e9ter hasonl\u00f3 a \u201ejel\/zaj\u201d ar\u00e1nyhoz az anal\u00f3g rendszerb\u0151l, a norm\u00e1l \u00e9rt\u00e9k 64QAM eset\u00e9n 28 dB-t\u0151l kezd\u0151dik. Itt j\u00f3l l\u00e1that\u00f3, hogy a bemutatott k\u00e9pen jelent\u0151s elt\u00e9r\u00e9sek a norm\u00e1ln\u00e1l jobb min\u0151s\u00e9get jelentenek: ez a digit\u00e1lis jel zajv\u00e9delmi szempontj\u00e1b\u00f3l kedvez\u0151.<\/p>\n<p>A fogadott jel hib\u00e1inak sz\u00e1ma (<b>CBER<\/b>) \u2014 a jel hib\u00e1inak sz\u00e1ma a hibajav\u00edt\u00f3 algoritmusok alkalmaz\u00e1sa el\u0151tt.<\/p>\n<p>A hib\u00e1k sz\u00e1ma a Viterbi dek\u00f3der m\u0171k\u00f6d\u00e9se ut\u00e1n (<b>VBER<\/b>) \u2014 a decoder's output that uses redundant information to recover errors in the signal. Both of these parameters are measured in 'pieces per amount received.' For the device to show an error count of less than one in a hundred thousand or ten million (as shown in the image), it needs to receive those ten million bits, which takes some time on a single channel, so the measurement result does not appear immediately and might even initially be poor (e-03, for example), but after a couple of seconds, it can reach an excellent parameter.<\/p>\n<h2>DVB-T2<\/h2>\n<p>\nThe standard for digital terrestrial broadcasting accepted in Russia can also be transmitted via cable. The constellation shape may surprise at first glance:<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbek sz\u00e1m\u00e1ra. 4. r\u00e9sz: A jel digit\u00e1lis \u00f6sszetev\u0151je\" src=\"\/wp-content\/uploads\/2019\/05\/3122eede760f4aaa34b924f34fdcd4b4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nThis rotation further enhances interference protection, as the receiver knows that the constellation should be rotated at a specified angle, allowing it to filter out what arrives without the programmed shift. It is evident that for this standard, the bit error rates are significantly higher, and the errors in the signal prior to processing do not exceed the measurement limits but instead amount to a quite realistic 8.6 per million. A decoder is used to correct them. <b>LDPC<\/b>, hence the parameter is called LBER.<br \/>\nDue to the increased interference protection, this standard supports a modulation level of 256QAM, but currently, only 64QAM is used in terrestrial broadcasting.<\/p>\n<h2>DVB-C<\/h2>\n<p>\nThis standard was originally created for cable transmission (C \u2014 Cable) \u2014 a medium much more stable than air, allowing for a higher modulation degree than DVB-T, thus transmitting a larger volume of information without using complex coding.<\/p>\n<p><img decoding=\"async\" alt=\"K\u00e1beltelev\u00edzi\u00f3s h\u00e1l\u00f3zatok a legkisebbek sz\u00e1m\u00e1ra. 4. r\u00e9sz: A jel digit\u00e1lis \u00f6sszetev\u0151je\" src=\"\/wp-content\/uploads\/2019\/05\/33c27eed12c0c66e35eae343710039f2.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nHere we see a constellation of 256QAM. The squares have increased in number and decreased in size. The probability of error has increased, meaning that a more reliable environment is needed for such a signal transmission (or more complex encoding, as in DVB-T2). Such a signal can 'fall apart' where analog and DVB-T\/T2 operate, but it also has a margin of interference protection and error correction algorithms.<\/p>\n<p>Due to the higher probability of error, the MER parameter for 256-QAM is standardized already at 32dB.<\/p>\n<p>A hib\u00e1s bitek sz\u00e1ml\u00e1l\u00f3ja egy nagys\u00e1grenddel emelkedett, \u00e9s m\u00e1r egy hib\u00e1s bitet sz\u00e1mol milli\u00e1rdonk\u00e9nt, de m\u00e9g ha ezek sz\u00e1mos milli\u00f3t tesznek is ki (PRE-BER ~E-07-8), a haszn\u00e1lt Reed-Solomon dek\u00f3der ebben a szabv\u00e1nyban minden hib\u00e1t el fog h\u00e1r\u00edtani.<br \/>\n<br \/>Forr\u00e1s: <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 5.0.3 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-4-tsifrovaya-sostavlyayushhaya-signala\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"hu_HU\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | 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