{"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\/cs\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-2-sostav-i-forma-signala","title":{"rendered":"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 2: Slo\u017een\u00ed a forma sign\u00e1lu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 2: Slo\u017een\u00ed a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/7b3a15cd9dddaf07211c89457054d0cd.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSign\u00e1l p\u0159en\u00e1\u0161en\u00fd prost\u0159ednictv\u00edm kabelov\u00e9 televize p\u0159edstavuje \u0161irokop\u00e1smov\u00e9, frekven\u010dn\u011b d\u011blen\u00e9 spektrum. Parametry sign\u00e1lu, v\u010detn\u011b frekvenc\u00ed a \u010d\u00edsel kan\u00e1l\u016f v Rusku, jsou regulov\u00e1ny normami GOST 7845-92 a GOST R 52023-2003, ale napln\u011bn\u00ed ka\u017ed\u00e9ho kan\u00e1lu si oper\u00e1tor m\u016f\u017ee zvolit podle vlastn\u00edho uv\u00e1\u017een\u00ed.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Obsah s\u00e9rie \u010dl\u00e1nk\u016f<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">\u010c\u00e1st 1: Obecn\u00e1 architektura s\u00edt\u011b KTV<\/a><\/noindex><\/li>\n<li>\u010c\u00e1st 2: Slo\u017een\u00ed a forma sign\u00e1lu<\/li>\n<li>\u010c\u00e1st 3: Analogov\u00e1 slo\u017eka sign\u00e1lu<\/li>\n<li>\u010c\u00e1st 4: Digit\u00e1ln\u00ed slo\u017eka sign\u00e1lu<\/li>\n<li>\u010c\u00e1st 5: Koaxi\u00e1ln\u00ed distribu\u010dn\u00ed s\u00ed\u0165<\/li>\n<li>\u010c\u00e1st 6: RF sign\u00e1ln\u00ed zesilova\u010de<\/li>\n<li>\u010c\u00e1st 7: Optick\u00e9 p\u0159ij\u00edma\u010de<\/li>\n<li>\u010c\u00e1st 8: Optick\u00e1 p\u00e1te\u0159n\u00ed s\u00ed\u0165<\/li>\n<li>\u010c\u00e1st 9: Hlavn\u00ed stanice<\/li>\n<li>\u010c\u00e1st 10: Diagnostika a \u0159e\u0161en\u00ed probl\u00e9m\u016f na KTV s\u00edti<\/li>\n<\/ul>\n<p>P\u0159ipom\u00edn\u00e1m, \u017ee nep\u00ed\u0161u u\u010debnici, ale osv\u011btlen\u00ed pro roz\u0161\u00ed\u0159en\u00ed obzor\u016f a vstup do sv\u011bta kabelov\u00e9 TV. Proto se sna\u017e\u00edm ps\u00e1t jednoduch\u00fdm jazykem, p\u0159i\u010dem\u017e kl\u00ed\u010dov\u00e1 slova z\u016fst\u00e1vaj\u00ed pro z\u00e1jemce a nezab\u00fdv\u00e1m se podrobn\u00fdm popisem technologi\u00ed, kter\u00e9 byly bez m\u00e9 pomoci pops\u00e1ny stovkami dal\u0161\u00edch.<\/p>\n<h1>\u010c\u00edm m\u011b\u0159\u00edme<\/h1>\n<p>\nPro z\u00edsk\u00e1n\u00ed informac\u00ed o sign\u00e1lu v koaxi\u00e1ln\u00edm kabelu n\u00e1\u0161 technick\u00fd person\u00e1l v\u011bt\u0161inou pou\u017e\u00edv\u00e1 p\u0159\u00edstroj Deviser DS2400T.<br \/>\n<img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 2: Slo\u017een\u00ed a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/16736bb28accd24fa63aba18629d83eb.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nV podstat\u011b je to televizn\u00ed p\u0159ij\u00edma\u010d, ale m\u00edsto obrazu a zvuku vid\u00edme kvantitativn\u00ed a kvalitativn\u00ed charakteristiky jak cel\u00e9ho spektra, tak jednotliv\u00fdch kan\u00e1l\u016f. N\u00e1sleduj\u00edc\u00ed ilustrace jsou sn\u00edmky obrazovky z tohoto p\u0159\u00edstroje.<\/p>\n<p>Takov\u00fd Deviser m\u00e1 dokonce n\u011bkolikan\u00e1sobn\u00e9 nadbyte\u010dn\u00e9 funkce, ale existuj\u00ed i p\u0159\u00edstroje je\u0161t\u011b sofistikovan\u011bj\u0161\u00ed: s obrazovkou, kter\u00e1 zobrazuje p\u0159\u00edmo televizn\u00ed obraz, p\u0159\u00edjmem optick\u00e9ho sign\u00e1lu, a co Deviserovi chyb\u00ed, p\u0159\u00edjmem satelitn\u00edho sign\u00e1lu DVB-S (ale to je \u00fapln\u011b jin\u00fd p\u0159\u00edb\u011bh).<\/p>\n<h1>Spektrum sign\u00e1lu<\/h1>\n<p>\nRychle posoudit stav sign\u00e1lu 'na oko' umo\u017e\u0148uje re\u017eim zobrazen\u00ed spektra.<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 2: Slo\u017een\u00ed a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/2b012db5798f40c20514290ed44d89e4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nV tomto re\u017eimu p\u0159\u00edstroj prov\u00e1d\u00ed skenov\u00e1n\u00ed kan\u00e1l\u016f v souladu s ur\u010den\u00fdm frekven\u010dn\u00edm pl\u00e1nem. Pro pohodl\u00ed byly z cel\u00e9ho spektra vy\u0159azeny nevyu\u017e\u00edvan\u00e9 frekvence v na\u0161\u00ed s\u00edti, a proto v\u00fdsledn\u00fd obraz p\u0159edstavuje plot kan\u00e1l\u016f.<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 2: Slo\u017een\u00ed a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/f6817317f6d0918c03eedd7f5684023e.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nModr\u00e1 barva ozna\u010duje digit\u00e1ln\u00ed kan\u00e1ly, \u017elut\u00e1 \u2013 analogov\u00e9. Zelen\u00e1 \u010d\u00e1st analogov\u00e9ho kan\u00e1lu je jeho zvukov\u00e1 slo\u017eka.<\/p>\n<p>Dob\u0159e je patrn\u00fd rozd\u00edl v \u00farovn\u00edch r\u016fzn\u00fdch kan\u00e1l\u016f: jednotliv\u00e1 nepravidelnost z\u00e1vis\u00ed na nastaven\u00ed transpond\u00e9r\u016f na hlavn\u00ed stanici, zat\u00edmco celkov\u00e9 rozd\u00edly mezi vy\u0161\u0161\u00edmi a ni\u017e\u0161\u00edmi frekvencemi maj\u00ed ur\u010dit\u00fd smysl, o kter\u00e9m budu hovo\u0159it n\u00ed\u017ee.<\/p>\n<p>V tomto re\u017eimu budou siln\u00e9 odchylky od normy dob\u0159e viditeln\u00e9 a pokud v s\u00edti nastanou v\u00e1\u017en\u00e9 probl\u00e9my, okam\u017eit\u011b se to projev\u00ed. Nap\u0159\u00edklad na uveden\u00e9m obr\u00e1zku je patrn\u00e9 vynech\u00e1n\u00ed dvou digit\u00e1ln\u00edch kan\u00e1l\u016f v oblasti vysok\u00fdch frekvenc\u00ed: tyto kan\u00e1ly jsou p\u0159\u00edtomny pouze v podob\u011b kr\u00e1tk\u00fdch prou\u017ek\u016f, kter\u00e9 sotva dosahuj\u00ed \u00farovn\u011b 10 dBmV (v\u00fd\u0161e je uvedena referen\u010dn\u00ed \u00farove\u0148 80 dBmV \u2014 to je horn\u00ed hranice grafu), co\u017e je v z\u00e1sad\u011b \u0161um, kter\u00fd kabel p\u0159ij\u00edm\u00e1 jako ant\u00e9na nebo vn\u00e1\u0161en\u00fd aktivn\u00edm za\u0159\u00edzen\u00edm. Tyto dva kan\u00e1ly jsou testovac\u00ed a byly vypnuty v dob\u011b psan\u00ed \u010dl\u00e1nku.<\/p>\n<p>Nedorozum\u011bn\u00ed m\u016f\u017ee vyvolat nerovnom\u011brnost um\u00edst\u011bn\u00ed digit\u00e1ln\u00edch a analogov\u00fdch kan\u00e1l\u016f. To ur\u010dit\u011b nen\u00ed spr\u00e1vn\u00e9 a do\u0161lo k n\u011bmu v d\u016fsledku evolu\u010dn\u00edho v\u00fdvoje s\u00edt\u011b: do frekven\u010dn\u00edho pl\u00e1nu byly jednodu\u0161e p\u0159id\u00e1v\u00e1ny dal\u0161\u00ed kan\u00e1ly do voln\u00e9 \u010d\u00e1sti spektra. P\u0159i vytv\u00e1\u0159en\u00ed frekven\u010dn\u00edho pl\u00e1nu od nuly by bylo spr\u00e1vn\u00e9 um\u00edstit v\u0161echny analogov\u00e9 kan\u00e1ly do doln\u00ed \u010d\u00e1sti spektra. Nav\u00edc u stanov\u00e9ho vybaven\u00ed ur\u010den\u00e9ho k formov\u00e1n\u00ed sign\u00e1lu pro evropsk\u00e9 zem\u011b existuj\u00ed omezen\u00ed na pou\u017e\u00edv\u00e1n\u00ed frekvenc\u00ed pro vys\u00edl\u00e1n\u00ed digit\u00e1ln\u00edho sign\u00e1lu a p\u0159esto\u017ee u n\u00e1s takov\u00e1 omezen\u00ed neexistuj\u00ed, pou\u017eit\u00ed takov\u00e9ho vybaven\u00ed nut\u00ed k um\u00edst\u011bn\u00ed digit\u00e1ln\u00edch kan\u00e1l\u016f ve spektru navzdory logice.<\/p>\n<h1>Tvar sign\u00e1lu<\/h1>\n<p>\nJak je zn\u00e1mo z fundament\u00e1ln\u00ed fyziky, \u010d\u00edm vy\u0161\u0161\u00ed je frekvence vlny, t\u00edm v\u011bt\u0161\u00ed je jej\u00ed \u00fatlum p\u0159i \u0161\u00ed\u0159en\u00ed. P\u0159i p\u0159enosu tak \u0161irokop\u00e1smov\u00e9ho sign\u00e1lu, jak\u00fd je v s\u00edti KTV, m\u016f\u017ee \u00fatlum v distribu\u010dn\u00ed s\u00edti dosahovat des\u00edtek decibel\u016f na rameno, p\u0159i\u010dem\u017e v doln\u00ed \u010d\u00e1sti spektra bude n\u011bkolikr\u00e1t ni\u017e\u0161\u00ed. Proto, kdy\u017e po\u0161leme do stojanu ze sklepa rovn\u00fd sign\u00e1l, na 25. pat\u0159e uvid\u00edme p\u0159ibli\u017en\u011b n\u00e1sleduj\u00edc\u00ed:<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 2: Slo\u017een\u00ed a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/df8b02e3904023bb254de8f1dd9d7d3c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00darove\u0148 vy\u0161\u0161\u00edch frekvenc\u00ed je v\u00fdrazn\u011b ni\u017e\u0161\u00ed ne\u017e \u00farove\u0148 ni\u017e\u0161\u00edch frekvenc\u00ed. V re\u00e1ln\u00e9 situaci m\u016f\u017ee televizor, pokud je nezn\u00e1m\u00fd, pova\u017eovat slab\u0161\u00ed kan\u00e1ly za \u0161um a filtrovat je. A pokud je v byt\u011b nainstalov\u00e1n zesilova\u010d, p\u0159i pokusu o jeho nastaven\u00ed pro kvalitn\u00ed p\u0159\u00edjem kan\u00e1l\u016f z horn\u00ed \u010d\u00e1sti p\u00e1sma dojde k p\u0159e zes\u00edlen\u00ed v doln\u00ed \u010d\u00e1sti. Normy reguluj\u00ed rozd\u00edl maxim\u00e1ln\u011b 15 dBmV na cel\u00e9 p\u00e1smo.<\/p>\n<p>Aby se tomu p\u0159ede\u0161lo, p\u0159i nastavov\u00e1n\u00ed aktivn\u00edho za\u0159\u00edzen\u00ed se p\u016fvodn\u011b nastavuje vy\u0161\u0161\u00ed \u00farove\u0148 v oblasti vysok\u00fdch frekvenc\u00ed. Tomu se \u0159\u00edk\u00e1 \u201ep\u0159\u00edm\u00fd sklon\u201c nebo jednodu\u0161e \u201esklon\u201c. A to, co je zobrazeno na obr\u00e1zku, je \u201eobr\u00e1cen\u00fd sklon\u201c, co\u017e je u\u017e porucha. Nebo minim\u00e1ln\u011b to nazna\u010duje, \u017ee s kabelem sm\u011brem k m\u00edstu m\u011b\u0159en\u00ed je probl\u00e9m. <\/p>\n<p>N\u011bkdy nast\u00e1v\u00e1 opa\u010dn\u00e1 situace, kdy jsou n\u00edzk\u00e9 frekvence prakticky nep\u0159\u00edtomn\u00e9, a vysok\u00e9 sotva prob\u00edhaj\u00ed nad \u00farovn\u00ed \u0161umu:<\/p>\n<p><img decoding=\"async\" alt=\"S\u00edt\u011b kabelov\u00e9 televize pro nejmen\u0161\u00ed. \u010c\u00e1st 2: Slo\u017een\u00ed a forma sign\u00e1lu\" src=\"\/wp-content\/uploads\/2019\/04\/a69fd310c5115b09f4cdf6d209e04fef.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nToto n\u00e1m tak\u00e9 nazna\u010duje po\u0161kozen\u00ed kabelu, konkr\u00e9tn\u011b jeho centr\u00e1ln\u00ed \u017e\u00edly: \u010d\u00edm vy\u0161\u0161\u00ed frekvence, t\u00edm bl\u00ed\u017ee k okraji vlnovodu se \u0161\u00ed\u0159\u00ed (skin efekt v koaxi\u00e1ln\u00edm kabelu). Proto vid\u00edme pouze ty kan\u00e1ly, kter\u00e9 se \u0161\u00ed\u0159\u00ed na vy\u0161\u0161\u00edch frekvenc\u00edch, ale jak\u00fdkoli televizor u\u017e je obvykle nebude schopen p\u0159ijmout na takov\u00e9 \u00farovni.<br \/>\n<br \/>Zdroj: <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 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