{"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\/sv\/blog\/administrirovanie\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-4-tsifrovaya-sostavlyayushhaya-signala","title":{"rendered":"Kabel-tv-n\u00e4t f\u00f6r de yngsta. Del 4: Den digitala komponenten av signalen","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kabel-tv-n\u00e4t f\u00f6r de yngsta. Del 4: Den digitala komponenten av signalen\" src=\"\/wp-content\/uploads\/2019\/05\/9d5b75de9baed1844b204cbc3e4b653a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVi vet alla att den tekniska v\u00e4rlden omkring oss \u00e4r digital eller str\u00e4var efter att bli det. Digital tv-s\u00e4ndning \u00e4r inte l\u00e4ngre en nyhet, men om du inte har intresserat dig f\u00f6r det specifikt, kan de teknologier som f\u00f6ljer med den \u00f6verraska dig.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Inneh\u00e5ll i artikelserien<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Del 1: Allm\u00e4n arkitektur f\u00f6r KTV-n\u00e4tet<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Del 2: Inneh\u00e5ll och form av signalen<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Del 3: Analog komponent av signalen<\/a><\/noindex><\/li>\n<li>Del 4: Digital komponent av signalen<\/li>\n<li>Del 5: Koaxial distributionsn\u00e4t<\/li>\n<li>Del 6: RF-signal f\u00f6rst\u00e4rkare<\/li>\n<li>Del 7: Optiska mottagare<\/li>\n<li>Del 8: Optisk ryggradn\u00e4t<\/li>\n<li>Del 9: Huvudstation<\/li>\n<li>Del 10: Fels\u00f6kning inom KTV-n\u00e4t<\/li>\n<\/ul>\n<h1>Inneh\u00e5llet i den digitala tv-signalen<\/h1>\n<p>\nDen digitala tv-signalen best\u00e5r av en transportstr\u00f6m av olika versioner av MPEG (ibland \u00e4ven andra codecs), s\u00e4nds via radiosignal med hj\u00e4lp av kvadratur-amplitudmodulering QAM av olika grader. Dessa ord b\u00f6r vara klara som dag f\u00f6r vilken som helst telekommunikat\u00f6r, s\u00e5 jag ger bara en gif fr\u00e5n <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/File:QAM16_Demonstration.gif\">Wikipedia<\/a><\/noindex>, som jag hoppas ska ge en f\u00f6rst\u00e5else f\u00f6r vad det \u00e4r f\u00f6r dem som \u00e4nnu inte har intresserat sig f\u00f6r det:<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-tv-n\u00e4t f\u00f6r de yngsta. Del 4: Den digitala komponenten av signalen\" src=\"\/wp-content\/uploads\/2019\/05\/283d4b7a8b196962c4cceb63489a2b10.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nS\u00e5dan modulering anv\u00e4nds i en eller annan form inte bara f\u00f6r \"tv-ankronism\", utan \u00e4ven f\u00f6r alla system f\u00f6r datatransmission som ligger i framkant av teknologin. Hastigheten p\u00e5 den digitala str\u00f6mmen i \"antenn\"-kabeln uppg\u00e5r till hundratals megabit!<\/p>\n<h1>Parametrar f\u00f6r den digitala signalen<\/h1>\n<p>\nGenom att anv\u00e4nda enhet Deviser DS2400T i l\u00e4get f\u00f6r att visa parametrarna f\u00f6r den digitala signalen kan vi se hur det faktiskt ser ut:<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-tv-n\u00e4t f\u00f6r de yngsta. Del 4: Den digitala komponenten av signalen\" src=\"\/wp-content\/uploads\/2019\/05\/68b91d37fad05b2ed6e3bc707fa26113.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nI v\u00e5rt n\u00e4tverk finns det signaler fr\u00e5n tre standarder: DVB-T, DVB-T2 och DVB-C. Vi g\u00e5r igenom dem en efter en.<\/p>\n<h2>DVB-T<\/h2>\n<p>\nDenna standard blev inte den fr\u00e4msta i v\u00e5rt land, d\u00e5 den fick ge plats \u00e5t den andra versionen, men den \u00e4r fullt anv\u00e4ndbar av operat\u00f6rer eftersom mottagarna f\u00f6r DVB-T2 \u00e4r bak\u00e5tkompatibla med den f\u00f6rsta generationens standard, vilket inneb\u00e4r att abonnenten kan ta emot en s\u00e5dan signal p\u00e5 praktiskt taget vilken digital tv som helst utan extra boxar. Dessutom har den standard som \u00e4r avsedd f\u00f6r luft\u00f6verf\u00f6ring (bokstaven T st\u00e5r f\u00f6r Terrestrial, \u00f6verf\u00f6ring via luft) s\u00e5 bra st\u00f6rningsskydd och redundans att den ibland fungerar d\u00e4r den analoga signalen av en eller annan anledning inte n\u00e5r fram.<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-tv-n\u00e4t f\u00f6r de yngsta. Del 4: Den digitala komponenten av signalen\" src=\"\/wp-content\/uploads\/2019\/05\/d2e68060fe9e9d7220fcbda65a8d76ac.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nP\u00e5 instrumentets sk\u00e4rm kan vi observera hur stj\u00e4rnbilden 64QAM byggs upp (standarden st\u00f6der QPSK, 16QAM, 64QAM). Det \u00e4r tydligt att punkterna i verkliga f\u00f6rh\u00e5llanden inte samlas p\u00e5 ett st\u00e4lle, utan kommer med viss spridning. Detta \u00e4r normalt s\u00e5 l\u00e4nge avkodaren kan best\u00e4mma vilken specifik ruta den ankommande punkten tillh\u00f6r, men \u00e4ven p\u00e5 den medf\u00f6ljande bilden \u00e4r det tydligt att det finns omr\u00e5den d\u00e4r de ligger precis p\u00e5 gr\u00e4nsen eller n\u00e4ra den. Med denna bild kan man snabbt<\/p>\n<p>I den v\u00e4nstra delen av sk\u00e4rmen under kanalnumret ser vi kvantitativa parametrar:<\/p>\n<p>Signalniv\u00e5 (<b>P<\/b>) i samma dBmV som f\u00f6r analog signal, men f\u00f6r digital signal f\u00f6reskriver GOST endast 50 dBmV vid ing\u00e5ngen till mottagaren. Det betyder att p\u00e5 omr\u00e5den med st\u00f6rre d\u00e4mpning kommer \"digitalsignalen\" att fungera b\u00e4ttre \u00e4n det analoga.<\/p>\n<p>V\u00e4rdet p\u00e5 moduleringens fel (<b>MER<\/b>) visar hur f\u00f6rvr\u00e4ngd signalen vi tar emot \u00e4r, det vill s\u00e4ga hur l\u00e5ngt den ankommande punkten kan vara fr\u00e5n mitten av rutan. Denna parameter liknar f\u00f6rh\u00e5llandet \"signal\/brus\" i ett analogt system, det normala v\u00e4rdet f\u00f6r 64QAM \u00e4r fr\u00e5n 28 dB. H\u00e4r \u00e4r det tydligt att betydande avvikelser i den medf\u00f6ljande bilden motsvarar kvalitet som \u00e4r \u00f6ver normen: h\u00e4r visar sig den st\u00f6rningst\u00e5liga digitala signalen.<\/p>\n<p>Antal fel i den mottagna signalen (<b>CBER<\/b>) \u2014 antal fel i signalen innan den bearbetas av n\u00e5gra korrigeringsalgoritmer.<\/p>\n<p>Antal fel efter att Viterbi-dekodern har arbetat (<b>VBER<\/b>) \u2014 resultatet av en dekodare som anv\u00e4nder \u00f6verfl\u00f6dig information f\u00f6r att \u00e5terst\u00e4lla fel i signalen. B\u00e5da dessa parametrar m\u00e4ts i \u00abstycken per accepterad m\u00e4ngd\u00bb. F\u00f6r att apparaten ska visa f\u00e4rre \u00e4n en fel per hundratusen eller tio miljoner (som i bilden) beh\u00f6ver den ta emot dessa tio miljoner bitar, vilket tar tid p\u00e5 en kanal, d\u00e4rf\u00f6r visas m\u00e4tresultatet inte omedelbart, och det kan f\u00f6rst vara d\u00e5ligt (E-03, till exempel), men efter n\u00e5gra sekunder kan det n\u00e5 en utm\u00e4rkt parameter.<\/p>\n<h2>DVB-T2<\/h2>\n<p>\nDen digitala marknadsstandarden som antagits i Ryssland kan ocks\u00e5 \u00f6verf\u00f6ras via kabel. Form av konstellationen kan vid f\u00f6rsta \u00f6gonkastet verka n\u00e5got f\u00f6rv\u00e5nande:<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-tv-n\u00e4t f\u00f6r de yngsta. Del 4: Den digitala komponenten av signalen\" src=\"\/wp-content\/uploads\/2019\/05\/3122eede760f4aaa34b924f34fdcd4b4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDenna vridning \u00f6kar \u00e4ven motst\u00e5ndskraften mot st\u00f6rningar, eftersom mottagaren vet att konstellationen b\u00f6r vara vriden under en viss vinkel, vilket inneb\u00e4r att man kan filtrera bort det som kommer utan en inb\u00e4ddad f\u00f6rskjutning. H\u00e4r ser vi att normerna f\u00f6r bitfel f\u00f6r denna standard \u00e4r av en mycket h\u00f6gre ordning, och felen i signalen, innan bearbetning, \u00f6verskrider inte m\u00e4tgr\u00e4nserna utan ligger p\u00e5 en helt realistisk niv\u00e5 av 8,6 per miljon. F\u00f6r deras korrigering anv\u00e4nds en dekodare. <b>LDPC<\/b>, d\u00e4rf\u00f6r kallas parametern LBER.<br \/>\nTack vare den \u00f6kade motst\u00e5ndskraften mot st\u00f6rningar st\u00f6djer denna standard en modulering av 256QAM, men f\u00f6r tillf\u00e4llet anv\u00e4nds endast 64QAM i markuts\u00e4ndningar.<\/p>\n<h2>DVB-C<\/h2>\n<p>\nDenna standard skapades ursprungligen f\u00f6r \u00f6verf\u00f6ring via kabel (C \u2014 Cable) \u2014 en milj\u00f6 som \u00e4r mycket mer stabil \u00e4n luften, vilket g\u00f6r det m\u00f6jligt att anv\u00e4nda en h\u00f6gre modulering \u00e4n DVB-T och d\u00e4rmed \u00f6verf\u00f6ra en st\u00f6rre m\u00e4ngd information utan att anv\u00e4nda komplex kodning.<\/p>\n<p><img decoding=\"async\" alt=\"Kabel-tv-n\u00e4t f\u00f6r de yngsta. Del 4: Den digitala komponenten av signalen\" src=\"\/wp-content\/uploads\/2019\/05\/33c27eed12c0c66e35eae343710039f2.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nH\u00e4r ser vi konstellationen 256QAM. Antalet kvadrater har \u00f6kat och deras storlek har minskat. Felskanningsm\u00f6jligheten har \u00f6kat, vilket inneb\u00e4r att f\u00f6r att \u00f6verf\u00f6ra en s\u00e5dan signal beh\u00f6vs en mer p\u00e5litlig milj\u00f6 (eller mer komplex kodning, som i DVB-T2). En s\u00e5dan signal kan 'falla s\u00f6nder' d\u00e4r analog och DVB-T\/T2 fungerar, men den har ocks\u00e5 en buffert mot st\u00f6rningar och felr\u00e4ttningsalgoritmer.<\/p>\n<p>P\u00e5 grund av den h\u00f6gre felfrekvensen \u00e4r parametern MER f\u00f6r 256-QAM redan normerad till 32dB.<\/p>\n<p>Felr\u00e4knaren f\u00f6r felaktiga bitar har \u00f6kat ytterligare en ordning och ber\u00e4knar nu en felaktig bit per miljard, men \u00e4ven om det skulle finnas hundratals miljoner (PRE-BER ~E-07-8), s\u00e5 kommer Reed-Solomon-dekoderaren som anv\u00e4nds i denna standard att korrigera alla fel.<br \/>\n<br \/>K\u00e4lla: <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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