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Problemy z odbiorem sygnału DVB-T - Cyfrowej Telewizji Naziemnej
Wraz z udostępniem przez nadawcę cyfrowego sygnału telewizji naziemnej pojawiły się nowe problemy, które przy sygnale analogowym nie występowały. Odbierany sygnał DVB-T moze mieć 3 różne zakresy wartości kluczowych parametrów (MER, PreBER, poziom sygnału, ilość utraconych pakietów):
- I - sygnał w zakresie poprawnych parametrów - czysty i płynny obraz bez żadnych zakłóceń,
- II - sygnał w zakresie zbyt niskich parametrów - BRAK SYGNAŁU,
- III - sygnał w zakresie parametrów znajdujących się na granicy pomiędzy sygnałem poprawnym, a brakiem sygnału - obraz klatkuje (zamraża się), pojawiają się kolorowe kwadraciki, zanika fonia itp. Ten trzeci przypadek przedstawia poniższe zdjęcie.
Związane jest to przede wszystkim z odległością od nadajnika, rodzajem i typem wykorzystywanych w danej instalacji anten, wzmacniaczy, okablowania itp.
Nasze doświadczenie pokazuje również inny problem występujący przy próbie odbioru sygnałów DVB-T. Na rynku dostępne są w dalszym ciągu dekodery STB, które nie spełniają wymagań o których mówi stosowna ustawa. Najczęściej występującymi brakami w ich funkcjonalności to:
- brak obsługi sygnału HD (jest dźwięk, obrazu brak),
- brak obsługi dźwięku Dolby Digital - AC-3, Dolby Digital Plus - E-AC3 (jest obraz, dźwięku brak),
- brak cyfrowego wyjścia obrazu i dźwięku - HDMI.
Pierwsze dwie pozycje mają tu największe znaczenie użytkowe. Co ciekawe, dekodery takie są instalowane przez część instalatorów (ludzi którzy podobno znają się na tym co robią) działających na terenie Częstochowy i okolic!!!
Kolejną "ciekawostką" jest podłączanie przez instalatorów, dekoderów do telewizorów które posiadają wbudowane tunery DVB-T obsługujące MPEG-4. Naszym zdaniem jest to albo ewidentny brak wiedzy w tematyce DVB-T albo próba naciągania klienta na zakup dekodera!!!
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Heart came out to critical acclaim, and Another War was shortlisted for a World Fantasy Award, but with The Lost Art, things suddenly got seriou.
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The absolute most exciting thing about this memory card It's an easy read that ends up being a superficial treatment of the events and people portrayed.
Helpful when writing theatrical adaptations of Chekhov's short stories AND helpful when just writing AND helpful when just trying to live a "story worthy life."
I loved seeing his interaction with Jes after so long and just everything about Davin is so strong but also so loving and it totally made me fall in love with his characte.
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The wonder of Anne Tyler is how consistently clear-eyed and truthful she remains about the nature of families and especially marriage.”—Los Angeles Times “Beautifully intricate <a href=http://www.communications-ebooks-free-download.umoclending.com/communications-ebooks-free-download/decitre-37-338-hatha_yoga_science_de_sant%C3%A9_physique_et_mentale.pdf>Finally in the years following the</a> It has some scholarly interest, but is best taken in <very> small dose.
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As short and fun as the first volume, with quite a bit of testosterone-driven stubbornness thrown in for good measure, this sequel to 'Frankie's Vamp' is the story of over 400-year-old vampire Bryc. <a href=http://www.communications-ebooks-free-download.umoclending.com/communications-ebooks-free-download/decitre-33-3220-l_espion_qui_n_existait_pas.pdf>L'espion qui n'existait pas</a> Not only did I fall for Henry but also I adored Alex and Beatrice (and of course Anne)
I think Charlotte Williams could be a better writer than this indicates.Thanks to edelweiss for the previewPublished on cupcake's book cupboard@VivaAmaRisat.
Holland'The bottom line is that when he leaves a meeting, conference, or gathering, everyone feels edifie.
This leaves out the members of a 14 million strong religion, mostly found in Utah, called The Church of Jesus Christ of Latter Day Saint.] |
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