{"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\/et\/blog\/novosti-interneta\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-2-sostav-i-forma-signala","title":{"rendered":"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 2: Signaali koostis ja formaat","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 2: Signaali koostis ja formaat\" src=\"\/wp-content\/uploads\/2019\/04\/7b3a15cd9dddaf07211c89457054d0cd.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKaabeltelevisiooni v\u00f5rgu kaudu edastatav signaal on lairibaga, sageduslahutusega spekter. Signaali parameetrid, sealhulgas sagedused ja kanalite numbrid, on Venemaal reguleeritud GOST 7845-92 ja GOST R 52023-2003, kuid kanali sisu valiku on operaatoril vaba.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Artiklite seeria sisu<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Osa 1: Kaabli-TV v\u00f5rgu \u00fcldine arhitektuur<\/a><\/noindex><\/li>\n<li>Osa 2: Signaali koostis ja vorm<\/li>\n<li>Osa 3: Signaali analoogne komponent<\/li>\n<li>Osa 4: Signaali digitaalne komponent<\/li>\n<li>Osa 5: Koaksiaalne jaotamisv\u00f5rk<\/li>\n<li>Osa 6: RF-signaali v\u00f5imendid<\/li>\n<li>Osa 7: Optilised vastuv\u00f5tjad<\/li>\n<li>Osa 8: Optiline peav\u00f5rk<\/li>\n<li>Osa 9: Peajaam<\/li>\n<li>Osa 10: Veaotsing ja t\u00f5rgete k\u00f5rvaldamine kaabli-TV v\u00f5rgus<\/li>\n<\/ul>\n<p>Kordan, et ma ei kirjuta \u00f5pikuid, vaid jagan teavet laiemalt, et tutvustada kaabeltelevisiooni maailma. Seet\u00f5ttu p\u00fc\u00fcan kirjutada lihtsas keeles, j\u00e4ttes v\u00f5tmes\u00f5nad huvilistele ja mitte s\u00fcvenedes tehnoloogia kirjeldustesse, mis on juba sadu kordi selgitatud.<\/p>\n<h1>Kuidas m\u00f5\u00f5dame<\/h1>\n<p>\nRohkem teabe saamiseks koaksiaalkaabli signaali kohta kasutab meie tehniline personal peamiselt Deviser DS2400T seadet<br \/>\n<img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 2: Signaali koostis ja formaat\" src=\"\/wp-content\/uploads\/2019\/04\/16736bb28accd24fa63aba18629d83eb.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTegemist on sisuliselt televastuv\u00f5tjaga, kuid pilti ja heli asemel n\u00e4eme kvantitatiivseid ja kvalitatiivseid omadusi nii kogu spektri kui ka \u00fcksikute kanalite kohta. Edasi toodud illustratsioonid on skeen\u0161otid sellest seadmest.<\/p>\n<p>Selline Deviser omab isegi mitmeid \u00fcleliigseid funktsioone, kuid leidub ka v\u00f5imsamaid seadmeid: ekraaniga, mis n\u00e4itab otse pildikvaliteeti, optiliste signaalide vastuv\u00f5tmisega ja, mida Deviser`ist puudu on, DVB-S satelliitsignaali vastuv\u00f5tmisega (kuid see on hoopis teine lugu).<\/p>\n<h1>Signaali spekter<\/h1>\n<p>\nSignaali seisundi kiiresti visuaalselt hindamine on v\u00f5imalik spektri kuvamisre\u017eiimis.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 2: Signaali koostis ja formaat\" src=\"\/wp-content\/uploads\/2019\/04\/2b012db5798f40c20514290ed44d89e4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSelles re\u017eiimis skaneerib seade kanaleid vastavalt m\u00e4\u00e4ratud sagedusplaanile. Mugavuse huvides on kogu spektrist eemaldatud meie v\u00f5rgu mittet\u00f6\u00f6tavad sagedused, seega saadud kujutis esindab kanalite aiaraiendust.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 2: Signaali koostis ja formaat\" src=\"\/wp-content\/uploads\/2019\/04\/f6817317f6d0918c03eedd7f5684023e.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSinise v\u00e4rviga on t\u00e4histatud digitaalsed kanalid, kollasega - analoogkanalid. Roheline osa analoogkanalist n\u00e4itab helikomponenti.<\/p>\n<p>Eraldi kanalite tasemeerinevused on h\u00e4sti n\u00e4htavad: eraldi eba\u00fchtlus s\u00f5ltub transponeerijate seadistustest pea jaamas ning \u00fcldine erinevus \u00fclemiste ja alumiste sageduste vahel omab teatud t\u00e4hendust, millest ma r\u00e4\u00e4gin allpool.<\/p>\n<p>Selles re\u017eiimis on selgelt n\u00e4ha suuremaid k\u00f5rvalekaldeid normist. Kui v\u00f5rgus esinevad t\u00f5sised probleemid, siis need avalduvad kohe. N\u00e4iteks antud pildil on n\u00e4ha, et k\u00f5rge sageduse alal on kadunud kaks digitaalset kanalit: need on kohal vaid l\u00fchikeste ribadena, mis ulatuvad vaevu 10 dBmV tasemele (\u00fcleval on antud v\u00f5rdluse tase 80 dBmV \u2014 see on diagrammi \u00fclemine piir), mis t\u00e4hendab, et tegelikult on see m\u00fcra, mille kaabel v\u00f5tab vastu nagu antenn v\u00f5i aktiivse seadme poolt sisendatud. Need kaks kanalit olid testkanalid ja need olid v\u00e4lja l\u00fclitatud artikli kirjutamise hetkel.<\/p>\n<p>V\u00f5ib olla segadust, et digitaalsete ja analoogkanalite paigutamine on ebav\u00f5rdne. See ei ole kindlasti \u00f5ige ja on tekkinud v\u00f5rgu arengus: sagedusplaani lisati lihtsalt t\u00e4iendavad kanalid vabasse spektrisse. Kui sagedusplaan oleks loodud nullist, oleks olnud \u00f5igem paigutada kogu analoog spektri alumisse ossa. Lisaks on Euroopa riikide jaoks m\u00f5eldud jaama seadmetel piirangud digitaalsete signaalide edastamiseks kasutatavate sageduste osas ja kuigi meie riigis selliseid piiranguid ei ole, tuleb sellise seadme kasutamisel paigutada digitaalsed kanalid spektrisse vastu loogikale.<\/p>\n<h1>Signaali kuju<\/h1>\n<p>\nKuna on teada, et mida k\u00f5rgem on laine sagedus, seda tugevam on selle n\u00f5rgenemine levimise ajal. Laiasagedusliku signaali, nagu see, mis on olemas kaabeltelevisiooniv\u00f5rgus, edasikandumise n\u00f5rgenemine jaotuss\u00fcsteemis v\u00f5ib ulatuda k\u00fcmnete detsibellideni, samas kui alumises spektris on see mitu korda v\u00e4iksem. Seet\u00f5ttu, kui saadame keldrist sirge signaali, n\u00e4eme 25. korrusel umbes j\u00e4rgmist:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 2: Signaali koostis ja formaat\" src=\"\/wp-content\/uploads\/2019\/04\/df8b02e3904023bb254de8f1dd9d7d3c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00dclemiste sageduste tase on m\u00e4rgatavalt madalam kui alumiste. Reaalses olukorras v\u00f5ib teler, aru saamata, n\u00f5rgemad kanalid lihtsalt m\u00fcraks pidada ja need filtreerida. Ja kui korteris on paigaldatud v\u00f5imendi, siis \u00fcritades selle seadistamiseks kvaliteetsete kanalite vastuv\u00f5ttu \u00fclemise osa spektrist, v\u00f5ib alumises osas esineda \u00fcleampereerimine. Standardid reguleerivad erinevust mitte rohkem kui 15 dBmV kogu spektris.<\/p>\n<p>Selle v\u00e4ltimiseks seadistatakse aktiivse seadme seadistamisel esialgu k\u00f5rgem tase k\u00f5rgel sagedusalal. Seda nimetatakse \u201eotse kaldus\u201d, v\u00f5i lihtsalt \u201ekaldus\u201d. Ning see, mis on pildil, on \u201etagasikaldus\u201d, ja selline pilt t\u00e4histab juba avariid. V\u00f5i v\u00e4hemalt viitab see sellele, et kaabliga m\u00f5\u00f5tmispunkti on midagi valesti. <\/p>\n<p>On ka vastupidine olukord, kus madalad sagedused on praktiliselt puuduvad, samas kui k\u00f5rged h\u00f5ljuvad just ja just \u00fcle m\u00fcra taseme:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 2: Signaali koostis ja formaat\" src=\"\/wp-content\/uploads\/2019\/04\/a69fd310c5115b09f4cdf6d209e04fef.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSee n\u00e4itab samuti kaabli, t\u00e4psemalt selle keskjuhti, kahjustamist: mida k\u00f5rgem on sagedus, seda l\u00e4hemale levib see lainejuhiks (skin-effect koaksiaalkaablis). Seet\u00f5ttu n\u00e4eme ainult neid kanaleid, mis levivad k\u00f5rgetes sagedustes, kuid tavaliselt ei suuda televiisor sellise taseme juures neid enam vastu v\u00f5tta.<br \/>\n<br \/>Allikas: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u0438\u0433\u043d\u0430\u043b, 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