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How do they send HDTV info ?

Discussion in 'Electronic Design' started by Rodo, Oct 18, 2003.

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  1. Rodo

    Rodo Guest

    Hi all....

    The normal television ch bw is 6MHz. What's the bw for a HDTV ch ? When I
    was in college, I read a paper that said it was bigger than 6MHz. It been
    about 3yr since then. How do they Tx the new signal so it coexist with the
    old one ?

  2. Baphomet

    Baphomet Guest

    Google is a wonderous thing
  3. Dr. O

    Dr. O Guest

    The new signal is transmitted within the same 6Mhz bandwidth, only it's
    digitally modulated (8VSB or CODFM).
  4. Gary Tait

    Gary Tait Guest

    Whereas On Sat, 18 Oct 2003 21:22:26 GMT, "Rodo" <>
    , I thus relpy:
    It doesn't, it is on a whole separate 6 Mhz digital carrier in the UHF
    spectrum. Also, it is not HDTV, but generally DTV, HDTV is one thing
    that can be used with the DTV platform .
  5. Rodo

    Rodo Guest

  6. Mark Zenier

    Mark Zenier Guest

    In the US the magic acronym is ATSC. (Advanced Televison Standards
    Committee). I think they're at

    1. It's sent using a modulation scheme that gives 3-4 bits per second
    per hertz of bandwidth. Around 18-20 MBps, shared out to more than
    one datastream, if the station feels like it.

    2. It uses video compression good enough that an NTSC analog transmission
    only needs about 4-5 MBps. (And if the viewers don't complain about
    compression artifacts and other crud, probably a whole lot less).

    Mark Zenier Washington State resident
  7. Baphomet

    Baphomet Guest

    Now if'n only I could remembre to use the spellt checkre... DUH
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