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Video signals

Discussion in 'Plasma TVs' started by Shadow_Zero, Oct 16, 2003.

  1. Shadow_Zero

    Shadow_Zero
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    This might be told over a 1000 times already, but I've read so many things the last couple of days and my brains are really exploding and I haven't found a post that covers all my question marks.

    Anyways, to begin with. Are these all the types of video signals or am I missing some (are these all video signals te begin with?) :

    Composite
    S-Video
    RGB
    Component (YPbPr / YCbCr)
    VGA
    DVI

    Am I correct when I say the first 4 are used in the A/V world (dvd etc.) and the last 2 in the PC world?

    Nowadays Plasma and LCD tv's also have these connections (or other tv's too?). Is the main purpose for connecting a video card then? Or is there hardware nowadays that uses these connections as well?

    And how are the differences in quality for RGB/Component and VGA and DVI?
    (I just call it VGA, but maybe that's wrong too).


    This is for a starters. I'm sure more questions will arouse in me ;)
     
  2. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    VGA is a term that gets used for an HD15 socket. It's not really a signal type, although it is a PC resolution

    DVI is another socket. It can be used for transmission of digital or analogue video signal.

    VGA /HD15 usually carries RGBHV signals but can carry many varients of RGB or YPrPb.

    THere are now DVD players with DVI outputs. In US there are STB's with DVI outputs.

    Video processors often have VGA/HD15 and or DVI inputs and outputs.

    I think there is a sticky thread here isn't there about this?

    Do a search for BEEKEEPER to read Dominics excellent thread about what is what in signal transmission

    Gordon
     
  3. Gordon @ Convergent AV

    Gordon @ Convergent AV
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  4. Shadow_Zero

    Shadow_Zero
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    These are all video signals too?
    Does the DVI signal have any particular name, or is "a digital video signal" just it?
    And what does HD from HD 15 stand for?

    While VGA and DVI aren't really signal types, they're different than (standard) RGB and Component and all, so I mentioned them in my report like that. Thought it was the easiest way :)
    But alternative suggestions are welcome ;)


    I did a search on BEEKEEPER but couldn't find anything...
     
  5. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    Does anyone know where Dominics great thread on connections has gone?

    SDI: Serial Digital interface (576i/480i)

    DVI: Digital Visual Interface (480P upwards to 1080P)

    HDMI: I think it is High Definition Mulit-media Interface (basically copy protected DVI signal type for video with digital audio as well)

    DVI HDCP: DVI with HDCP copy protection applied on top

    HD on HD15 means: High Density 15 pin socket/plug
     
  6. Gordon @ Convergent AV

    Gordon @ Convergent AV
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  7. Shadow_Zero

    Shadow_Zero
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    I'm mostly concentrating on info about video signals which are common on tv's and monitors.
    I dunno if all of those are part of that (firewire even?) ?
     
  8. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    composite,
    and component are signal types

    Component can be
    s-video, YPrPb and RGB

    RGB can have sync signal on green or
    RGBS or RGBHV or RGBComposite sync.

    Component can also be digital as YUV

    VGA/HD15/FIREWIRE/SDI/DVI/HDMI/DVIHDCP are interfaces for signal types just like a scart socket or a BNC socket is.

    Once you get above S-video bandwidth you can also start getting many resolutions carried as those signal types through the interfaces.

    It's not possible to say that one signal type or interface is best unfortunately as the implimentation within a display can have a large affect on image quality. It is however pretty safe to say that COMPOSITE is always best avoided.........

    Gordon
     
  9. Shadow_Zero

    Shadow_Zero
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    Lots of complicated stuff ;)

    What I wonder now, is it possible to get a good quality desktop on a tv?
    Like, if I connect my tv-out from my videocard with s-video to my tv the quality is mediocre and the refresh rate is low. Is there any way to get that better?
    Or is the only way to get it better to use a VGA or DVI cable on a Plasma/LCD tv?

    Or are there perhaps converters that can do miracles?
     
  10. Chris Muriel

    Chris Muriel
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    If you have a VGA (AGP) card with DVI output and a flatpanel display (plasma or fast-response LCD) with DVI input then you theoretically get a better picture because you have avoided the processing and distortion (quantisation & other errors) inherent in the video DACs (Digital to Analogue Converters) needed to go from the digital to the analogue domain.
    In other words, if you can keep the signal digital to a display device that is also digital you should see better results.
    A decent plasma or LCD display should have higher resolution than a TV tube anyway (resulting in potentially sharper pictures)

    Chris Muriel, Mancheter.
     
  11. Shadow_Zero

    Shadow_Zero
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    What is the resolution of a tv anyway?
    Was that 320x240 or something?

    I'm wondering, why is a CRT monitor capable of much higher resolutions than a television; is that a hardware aspect or purely the videocart (or perhaps both) ?

    Are LCD-monitors and LCD-tv's capable of the same resolution?
    What is usually the resolution a LCD-tv and Plasma-tv have?

    And are there devices/converters to improve the display on a standard tv? (like a vga cable goes into such a converter box and then a s-video cable or something comes out and gets into the tv).
     

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