Which do you think has the better comb filter; my HLN467 TV or my HDVR2 DirecTivo PVR

Discussion in 'Displays' started by Luke_Y, Oct 7, 2003.

  1. Luke_Y

    Luke_Y Second Unit

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    Which do you think has the better comb filter; my HLN467 TV or my HDVR2 DirecTivo PVR?

    If the PVR has the better comb filter (doubtful?) I understand it would be best to use the S-Vid out. But...

    If the TV has a better comb filter wouldn't it be better to feed it a composite signal from the PVR and let the better comb filter in the TV convert to S-Vid.
     
  2. StephenL

    StephenL Second Unit

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    A comb filter separates the chrominance (color) and luminance (brightness) portions of a composite video signal. If the signals are seperate to begin with (which is the case with your satelite receiver connected via S-Video) there is no need for a comb filter.

    If you could only buy your beer and milk mixed together in one container (composite beverage), you would want a good filter to seperate them. If you could get your beer and milk in seperate containers, why in the world would you want to combine them? Just to show off your fancy filter? [​IMG]
     
  3. Luke_Y

    Luke_Y Second Unit

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  4. Stephen Tu

    Stephen Tu Screenwriter

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    The signals are separate to begin with. DirecTV is transmitting digital video over the satellite. Digital video has 3 components - a luminance, black & white signal (Y), and 2 color difference signals (Cr, Cb). The satellite receiver decodes this and combines the color difference signals, so now you have two signals, Y & C, which is what S-video uses. A comb filter only comes into play if you further combine the Y & C into a single composite video signal; the comb filter reseparates them.

    The "deciding which component has better comb filter" only applies to sources that work with composite video, e.g. laserdisc, or the analog channels on a cable box. It has no relevance when you are using digital video.
     
  5. Luke_Y

    Luke_Y Second Unit

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    Thanks for the explanation. I think I understand now.

    The reason I was interested and perhaps confused was the seemingly large number of posts here and at AVS where people are stating that they are finding a better picture on the Standard definition channels using composite or even RF coax connections as opposed to the S-Video. Most of the posts were pertaining to the Samsung DLP sets. I assumed that it would be a comb filter issue but now I see that no, thats not the reason.
     

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