DVD player horizontal resolutions

Discussion in 'Playback Devices' started by RickardL, Oct 8, 2003.

  1. RickardL

    RickardL Second Unit

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    What can be said of a DVD players ability to produce
    a certain number of lines in terms of horizontal resolution?
    I see players that have "over 500 lines" and some say
    "540 lines", is there any noticeable difference when
    projected on a 100" screen?
    or is it just marketing?
    BTW, is 540 the maximum?
     
  2. Don_Berg

    Don_Berg Supporting Actor

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    Yes 540 TV-lines is the maximum from the DVD standard. To convert TV-lines to horizontal pixel resolution you multiply it by 4/3, so 540*4/3 = 720 horizontal pixels. DVD resolution is 720x480 maximum. I haven't seen many DVD players specify their output resolution. But some have been measured in regard to their output frequency response with an AVIA DVD's multiburst test pattern which check the amplitude output at various frequencies. Many DVD players dropoff quite a bit at the higher frequncies (5Mhz or so) and therefore produce a softer image than others. The top-rated DVD players (Panasonic RP82,XP30,XP50 and Denon DVD-1600) have a virtually flat frequency response and hence a noticeably sharper picture. I would say they have the highest resolution due to their superior video circuitry.
     
  3. RickardL

    RickardL Second Unit

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    Would a flat frequency response up to 6.75Mhz be able to
    produce a resolution of 540 lines?
    Some Denon players have a filter which cuts off anything
    above 6.75Mhz in order to get rid of unwanted signal
    so that a higher S/N ratio can be achieved.
    I guess that 6.75Mhz is enough based on that, or?
     
  4. Don_Berg

    Don_Berg Supporting Actor

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    Yes 6.75Mhz is the most DVD can provide, it should be filtered above that.
     

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