COMP or Y/C

Discussion in 'Blu-ray & DVD Players & Recorders' started by avelagapudi, Aug 12, 2001.

  1. avelagapudi

    avelagapudi
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    Hi,

    On my JVC DVD player, I have a switch on the back that says Comp or Y/C. The manual seems to suggest that Y/C gives a better picture but using it causes smearing on my TV.<br />Can anyone shed any light on these two settings and what they mean ?

    Arry
     
  2. LV426

    LV426
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    Comp = Composite. The entire video signal is transmitted via a single cable.

    Y/C = also known as S-Video. The brightness (aka luminance or Y) part of the signal is sent down one cable; the colour (aka chrominance or C) signal down another ie the two major parts of the signal are split.

    Y/C results in a theoretically better signal because there is reduced likelihood of the two components interfering with one another. The TV needs to be capable of handling, and set properly to receive - the S-Video signal.

    As to why it causes "smearing" on your setup - I have no idea.
     
  3. John Jennings

    John Jennings
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    Two possible reasons for the colour smearing on Y/C (ie S-video (aka SVHS))

    1) Your telly doesn't know it's receiving an S-video signal (check in the menus that this scart is set to receive s-video. Probably in the 'Set-up' menus somewhere)

    2) You're not using an s-video capable cable. You'll either need a fully wired Scart (some cheap scarts don't have all pins wired) or a dedicated S-video cable (four pin mini-din socket)

    Hope this helps,<br />John
     
  4. avelagapudi

    avelagapudi
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    Thanks for the info.<br />The tv does have a setting for the av channel to receive an S-Video signal (which it calls S-VHS and hence the confusion).<br />When I select this with Y/C from the DVD all is right with the picture.
     
  5. John Jennings

    John Jennings
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    Is it better than 'Comp'? If there's not much difference then Comp probably means 'Component' rather than 'Composite' (but should more correctly be labelled RGB if it's via SCART)
     
  6. ReTrO

    ReTrO
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    Comp probably means composite video, or CVBS. Don't use this since it is the lowest standard of video connection, and hence quality.

    If it's component, which is qulikely unless it's a Toshiba set, then use that, if your DVD has component (YUV) outputs.

    The smearing could be caused by a dodgy comb-filter or SCART lead, or a timing (sync) problem.

    John: Component and RGB are two different colour systems, so best not to confuse them.

    [ 14-08-2001: Message edited by: ReTrO ]</p>
     
  7. Stuart Wright

    Stuart Wright
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    It astonishes me that manufacturers label the S-Video socket 'SVHS'. SVHS - video tape format.
     
  8. Reiner

    Reiner
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    Me too. Says someone owning a Nokia SAT receiver ...
     
  9. John Jennings

    John Jennings
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    Yeah, I realise that Component and RGB are different, that's why I said it should 'more correctly' be called RGB. The fact that they'd labelled S-video as SVHS made it possible that they could have messed up here too.
     
  10. avelagapudi

    avelagapudi
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    I spent a little time comparing the two settings i.e.DVD set to Comp and AV channel set to "normal", compared to DVD set to Y/C and AV channel set to "S".<br />I didn't really notice any differences with "Emperors New Groove" but for some reason I thought that the Comp signal had richer colours with "Pitch Black" (both R1). But that said it was late and I need to check some more.
     
  11. Reiner

    Reiner
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    The difference from composite to S-Video should be significant while the step to RGB orcomponent (both of which I rate equally) will only show slight improvements - but it's there.<br />Some do prefer S-Video though, if you think composite gives the better picture please see an optician. <img src="biggrin.gif" border="0">
     
  12. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    Composite has colour and black and white info carried in the same signal. Your TV has to extract the colour info from the balck and white to process it properly. The device used to do this is a notch or comb filter. The probelm with composite is that no matter how good the filter used to extract the info it either leaves some colour info in with the black and white or it take ssome of the black and white out with the colour.....

    S-Video sends the black and white and colour info seperately. No comb filter or nothch filter required. The result is greater accuracy of black and white detail and colour saturation.

    The visible effects of this are that with composite you'll see a thing called "dot crawl". This is like spots of flashing colour at edges of solid colour's. This is seen with most folks Sky Menu as twittering on the edges of text. Go to RGB out and it disappears. On DVD's you should see similar effect. At the event I will be showing folk this phenomenon. On some discs it is very obvious. On others not so. On direct view TV's artifacts like these are also less annoying as the image is so small compared to your field of view.

    Hope this helps.

    Gordon
     

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