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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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She is her own person and it’s fab! As for romance, this book was the perfect break from those ridiculous love at first sight, too quick romances and love triangle.
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Everywhere she looked, Fawn saw negative portrayals of marriage dominating the airwaves and dooming everyone to failure.Looking at Keith, the love of her life, she knew that wasn t tru.
I've been looking forward to reading about Kelly and Jamie for a while now and I was a little disappointe.
Dylan is and always be Jaime's Halo! Such a sweet couple with a darkness only the two can embrace and В understand В each other to move forward.В Awe!!! Dylan and Jaime *heart melting* They make falling in love so complicated but oh so irresistibl.]
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