{"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\/et\/blog\/administrirovanie\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-4-tsifrovaya-sostavlyayushhaya-signala","title":{"rendered":"Kaabeltelevisiooniv\u00f5rgud lastele. Osa 4: Signaali digitaalne komponent","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud lastele. Osa 4: Signaali digitaalne komponent\" src=\"\/wp-content\/uploads\/2019\/05\/9d5b75de9baed1844b204cbc3e4b653a.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMe k\u00f5ik teame, et tehnika maailm meie \u00fcmber on digitaalne v\u00f5i p\u00fc\u00fcab selle poole liikuda. Digitaalne ringh\u00e4\u00e4ling ei ole sugugi uudis, kuid kui te ei ole selles valdkonnas s\u00fcvenenud, v\u00f5ivad teid \u00fcllatada selle tehnoloogiad.<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><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Osa 2: Signaali koostis ja vorm<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Osa 3: Signaali analoogne komponent<\/a><\/noindex><\/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<h1>Digitaalse televisioonisignaali koostis<\/h1>\n<p>\nDigitaalne televisioonisignaal on erinevate MPEG-versioonide (m\u00f5nikord ka teiste koodekite) transportvoog, mida edastatakse raadiolainena ruudukujulise amplituudmodulatsiooni QAM erinevate astmete kasutamisega. Iga sideinimese jaoks peaksid need s\u00f5nad olema selged nagu p\u00e4ev, seega tooma vaid gif-i, <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/File:QAM16_Demonstration.gif\">vikipeedia<\/a><\/noindex>, mis, loodan, annab arusaama, mida see endast kujutab neile, kes veel ei huvitanud:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud lastele. Osa 4: Signaali digitaalne komponent\" src=\"\/wp-content\/uploads\/2019\/05\/283d4b7a8b196962c4cceb63489a2b10.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSellist modulatsiooni kasutatakse mitte ainult \u00abteleanahhronismi\u00bb puhul, vaid ka k\u00f5ikides andmeside s\u00fcsteemides, mis on tehnoloogia tipus. Digitaalse voolu kiirus \u201eantennikaablis\u201c ulatub sadadesse megabittidesse!<\/p>\n<h1>Digitaalse signaali parameetrid<\/h1>\n<p>\nKasutades seadet Deviser DS2400T digitaalsete signaaliparameetrite kuvamise re\u017eiimis, saame n\u00e4ha, kuidas see tegelikult v\u00e4lja n\u00e4eb:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud lastele. Osa 4: Signaali digitaalne komponent\" src=\"\/wp-content\/uploads\/2019\/05\/68b91d37fad05b2ed6e3bc707fa26113.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMeie v\u00f5rgus on signaalid kolme standardi: DVB-T, DVB-T2 ja DVB-C. Vaatame neid j\u00e4rjest.<\/p>\n<h2>DVB-T<\/h2>\n<p>\nSee standard ei saanud meie riigis peamiseks, andes teise versiooni v\u00f5imaluse, kuid see on siiski operaatori jaoks kasutamiseks sobiv, kuna DVB-T2 vastuv\u00f5tjad on tagasi\u00fchilduvad esmaklassilise standardiga. See t\u00e4hendab, et tellija saab teie digiteleviisoris signaali vastu v\u00f5tta ilma t\u00e4iendavate vastuv\u00f5tjate vajaduseta. Lisaks sellele on standard, mis on m\u00f5eldud \u00f5hus edastamiseks (T-t\u00e4ht t\u00e4hendab maapealset), nii hea h\u00e4irekindluse ja \u00fclek\u00fclluse poolest, et m\u00f5nikord t\u00f6\u00f6tab seal, kus mingi p\u00f5hjusel analoogsignaal ei j\u00f5ua.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud lastele. Osa 4: Signaali digitaalne komponent\" src=\"\/wp-content\/uploads\/2019\/05\/d2e68060fe9e9d7220fcbda65a8d76ac.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSeadmestiku ekraanil saame j\u00e4lgida, kuidas moodustub 64QAM t\u00e4hendus (standard toetab QPSK, 16QAM, 64QAM). On selge, et reaalses olukorras punktid ei koondu \u00fchte, vaid tulevad m\u00f5ningase hajumisega. See on normaalne seni, kuni dekooder suudab m\u00e4\u00e4rata, millise ruuduga saabunud punkt kuulub, kuid isegi antud pildil on n\u00e4ha piirkondi, kus need asuvad piiril v\u00f5i l\u00e4heduses. Selle pildi j\u00e4rgi saab kiiresti \"silma j\u00e4rgi\" m\u00e4\u00e4rata signaali kvaliteeti: kui v\u00f5imendi t\u00f6\u00f6 ei ole hea, paiknevad punktid kaootiliselt ja televiisor ei suuda andmetest pilti koguda: \"pixeliseerub\" v\u00f5i j\u00e4\u00e4b t\u00e4iesti seisma. Esinevad juhud, mil v\u00f5imendi protsessor \"unustab\" signaali \u00fche komponendi (amplituudi v\u00f5i faasi) lisada. Sellistel juhtudel v\u00f5ib seadme ekraanil n\u00e4ha ringi v\u00f5i r\u00f5ngast, mis katab kogu ala. Kaks punkti peamisest piirkonnast v\u00e4ljaspool on vastuv\u00f5tja tugipunktid ja need ei kanna teavet.<\/p>\n<p>Ekraani vasakus osas kanalinumbri all n\u00e4eme kvantitatiivseid parameetreid:<\/p>\n<p>Signaali tase (<b>P<\/b>) \u0432 \u0442\u0435\u0445 \u0436\u0435 \u0434\u0411\u043c\u043a\u0412, \u0447\u0442\u043e \u0438 \u0434\u043b\u044f \u0430\u043d\u0430\u043b\u043e\u0433\u0430, \u043e\u0434\u043d\u0430\u043a\u043e \u0434\u043b\u044f \u0446\u0438\u0444\u0440\u043e\u0432\u043e\u0433\u043e \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0413\u041e\u0421\u0422 \u0440\u0435\u0433\u043b\u0430\u043c\u0435\u043d\u0442\u0438\u0440\u0443\u0435\u0442 \u0443\u0436\u0435 \u043b\u0438\u0448\u044c 50\u0434\u0411\u043c\u043a\u0412 \u043d\u0430 \u0432\u0445\u043e\u0434\u0435 \u0432 \u043f\u0440\u0438\u0451\u043c\u043d\u0438\u043a. \u0422\u043e \u0435\u0441\u0442\u044c \u043d\u0430 \u0443\u0447\u0430\u0441\u0442\u043a\u0430\u0445 \u0441 \u0431\u043e\u0301\u043b\u044c\u0448\u0438\u043c \u0437\u0430\u0442\u0443\u0445\u0430\u043d\u0438\u0435\u043c \u00ab\u0446\u0438\u0444\u0440\u0430\u00bb \u0431\u0443\u0434\u0435\u0442 \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u043b\u0443\u0447\u0448\u0435 \u0430\u043d\u0430\u043b\u043e\u0433\u0430.<\/p>\n<p>\u0417\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043c\u043e\u0434\u0443\u043b\u044f\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u043e\u0448\u0438\u0431\u043e\u043a (<b>MER<\/b>) \u043f\u043e\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u0442 \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0438\u0441\u043a\u0430\u0436\u0451\u043d\u043d\u044b\u0439 \u0441\u0438\u0433\u043d\u0430\u043b \u043c\u044b \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0435\u043c, \u0442\u043e \u0435\u0441\u0442\u044c \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0434\u0430\u043b\u0435\u043a\u043e \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043f\u0440\u0438\u043b\u0435\u0442\u0435\u0432\u0448\u0430\u044f \u0442\u043e\u0447\u043a\u0430 \u043e\u0442 \u0446\u0435\u043d\u0442\u0440\u0430 \u043a\u0432\u0430\u0434\u0440\u0430\u0442\u0430. \u042d\u0442\u043e \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 \u0441\u0445\u043e\u0436 \u0441 \u043e\u0442\u043d\u043e\u0448\u0435\u043d\u0438\u0435\u043c \u00ab\u0441\u0438\u0433\u043d\u0430\u043b\/\u0448\u0443\u043c\u00bb \u0438\u0437 \u0430\u043d\u0430\u043b\u043e\u0433\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b, \u043d\u043e\u0440\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0434\u043b\u044f 64QAM \u2014 \u043e\u0442 28\u0434\u0411. \u0422\u0443\u0442 \u0445\u043e\u0440\u043e\u0448\u043e \u0432\u0438\u0434\u043d\u043e, \u0447\u0442\u043e \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043e\u0442\u043a\u043b\u043e\u043d\u0435\u043d\u0438\u044f \u043d\u0430 \u043f\u0440\u0438\u0432\u0435\u0434\u0451\u043d\u043d\u043e\u043c \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0438 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0442 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0443 \u0432\u044b\u0448\u0435 \u043d\u043e\u0440\u043c\u044b: \u0432 \u044d\u0442\u043e\u043c \u043f\u043e\u043c\u0435\u0445\u043e\u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u043e\u0441\u0442\u044c \u0446\u0438\u0444\u0440\u043e\u0432\u043e\u0433\u043e \u0441\u0438\u0433\u043d\u0430\u043b\u0430.<\/p>\n<p>\u041a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043e\u0448\u0438\u0431\u043e\u043a \u0432 \u043f\u0440\u0438\u043d\u044f\u0442\u043e\u043c \u0441\u0438\u0433\u043d\u0430\u043b\u0435 (<b>CBER<\/b>) \u2014 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043e\u0448\u0438\u0431\u043e\u043a \u0432 \u0441\u0438\u0433\u043d\u0430\u043b\u0435 \u0434\u043e \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043a\u0430\u043a\u0438\u043c\u0438 \u043b\u0438\u0431\u043e \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430\u043c\u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f.<\/p>\n<p>\u041a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043e\u0448\u0438\u0431\u043e\u043a \u043f\u043e\u0441\u043b\u0435 \u0440\u0430\u0431\u043e\u0442\u044b \u0434\u0435\u043a\u043e\u0434\u0435\u0440\u0430 \u0412\u0438\u0442\u0435\u0440\u0431\u0438 (<b>VBER<\/b>) \u2014 dekooderi t\u00f6\u00f6 tulemus, mis kasutab \u00fclem\u00e4\u00e4rast teavet signaalivead taastamiseks. M\u00f5lemat parameetrit m\u00f5\u00f5detakse \u00abt\u00fckkidena v\u00f5etud arvu kohta\u00bb. Et seade n\u00e4itaks vigade arvu v\u00e4hem kui \u00fcks sadatuhande v\u00f5i k\u00fcmne miljoni kohta (nagu on n\u00e4idatud pildil), peab see vastu v\u00f5tma need k\u00fcmme miljonit bitti, mis \u00fche kanali kaudu v\u00f5tab aega, seet\u00f5ttu ei ilmu m\u00f5\u00f5tmisresultaat kohe, vaid v\u00f5ib alguses olla halb (n\u00e4iteks E-03), kuid paari sekundi p\u00e4rast saavutab suurep\u00e4rase v\u00e4\u00e4rtuse.<\/p>\n<h2>DVB-T2<\/h2>\n<p>\nVenemaa poolt aktsepteeritud digitaalsete teravikku edastamise standardit saab samuti edastada kaabli kaudu. T\u00e4hekujund v\u00f5ib esmapilgul m\u00f5nev\u00f5rra \u00fcllatada:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud lastele. Osa 4: Signaali digitaalne komponent\" src=\"\/wp-content\/uploads\/2019\/05\/3122eede760f4aaa34b924f34fdcd4b4.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSee p\u00f6\u00f6rdumine suurendab t\u00e4iendavalt h\u00e4irekindlust, kuna vastuv\u00f5tja teab, et t\u00e4hes\u00fcsteem peab olema suunatud antud nurga alla, mist\u00f5ttu saab filtreerida sisse tulevat signaali, ilma et oleks eelnevalt lisatud nihkeid. Siit on n\u00e4ha, et selle standardi piires on bitivigade normid j\u00e4rsult k\u00f5rgemad ja signaalivead enne t\u00f6\u00f6tlemist ei \u00fcleta enam m\u00f5\u00f5tmispiire, vaid j\u00e4\u00e4vad t\u00e4iesti reaalsete 8,6 miljoni kohta. Nende parandamiseks kasutatakse dekooderit. <b>LDPC<\/b>, seega nimetatakse parameetrit LBER.<br \/>\nT\u00e4nu t\u00f5hustatud h\u00e4irekindlusele toetab see standard 256QAM modulaat taset, kuid hetkel kasutatakse eetriv\u00f5rgus vaid 64QAM.<\/p>\n<h2>DVB-C<\/h2>\n<p>\nSee standard loodi algselt edastamiseks kaabli kaudu (C \u2014 Cable) \u2014 keskkonnas, mis on oluliselt stabiilsem kui \u00f5hk, mist\u00f5ttu v\u00f5imaldab see kasutada k\u00f5rgemat modulaatust kui DVB-T, mis t\u00e4hendab suurema teabe edastamist, ilma et oleks vaja keerulist kodeerimist.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud lastele. Osa 4: Signaali digitaalne komponent\" src=\"\/wp-content\/uploads\/2019\/05\/33c27eed12c0c66e35eae343710039f2.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSiin n\u00e4eme t\u00e4hekoonda 256QAM. Ruute on saanud rohkem, nende suurus on v\u00e4henenud. Veaoht on suurenenud, seega on sellise signaali edastamiseks vajalik usaldusv\u00e4\u00e4rsem keskkond (v\u00f5i keerulisem kodeerimine, nagu DVB-T2). Selline signaal v\u00f5ib \"laguneda\" seal, kus t\u00f6\u00f6tavad analoog ja DVB-T\/T2, kuid tal on ka m\u00fcra taluvuse reserv ja vigade parandamise algoritmid.<\/p>\n<p>Suurema veaohu t\u00f5ttu on 256-QAM jaoks MER v\u00e4\u00e4rtus normeeritud 32 dB.<\/p>\n<p>Veakoodide arvesti on t\u00f5usnud veel \u00fche korra ja arvutab n\u00fc\u00fcd \u00fche vea miljardi kohta, kuid isegi kui neid on sadu miljoneid (PRE-BER ~E-07-8), eemaldab selle standardi dekooder Reed-Solomon k\u00f5ik vead.<br \/>\n<br \/>Allikas: <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. 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