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What happens to 100Hz TV when displaying NTSC signal ??

Discussion in 'Televisions' started by zcaps57, Apr 20, 2003.

  1. zcaps57

    zcaps57
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    Hi.

    I understand that 100Hz TV should work fine with PAL materials since PAL runs at 50Hz. So... if it's progressive, it frame-doubles, and if it's interlaced it field-doubles. From 50Hz to 100Hz.

    But how do they deal with NTSC which is 60Hz ? Do they display NTSC in 60Hz natively, or double it to 120Hz, or something else ?
     
  2. John Jennings

    John Jennings
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    They go to 120 Hz. Soopha fast refresh!
     
  3. nathan_silly

    nathan_silly
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    Info regarding 120hz?

    I would guess when a 60hz NTSC signal is detected it increases framerate upto 100hz, and not doubles to 120hz.
     
  4. zcaps57

    zcaps57
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    Nathan,

    increasing framerate contained in the NTSC signal to 100Hz is impossible. It cannot create nor increase what's not in there.

    It can increase 'vertical refresh rate', but increasing 'frame rate' is not possible. Frame, field, and refresh rate are different animals.
    And increasing 60 Hz NTSC to 100Hz would introduce tons of artifacts. :(

    Now, John, is your post based on facts or are you trolling around ?
     
  5. John Jennings

    John Jennings
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    Zcaps,

    No, I'm not trolling. I'm trying to be helpful.

    Answer is based on the responses given to this question on this forum when it's been asked plenty of times in the past. Results do seem to vary based on the TV model, but most go to 120Hz.

    Have a look using the search button.

    John
     
  6. Jase

    Jase
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    My previous JVC (100hz) doubled the NTSC refresh rate to 120hz, current one leaves it at 60hz (PAL is 75hz).
     

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