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ADV7182 creates dark line at bottom with NTSC input when ACE is ON

Hello,

I am facing an issue with ADV7182 chip in NTSC input format where I can see the dark line at the bottom when ACE feature is ON.

This dark line is clearly visible in blue color in free-run mode. The same is visible even in actual NTSC blue color data.

This dark line issue at bottom is seen only with NTSC format when ACE feature is ON.

And the dark line at bottom is not observed with NTSC format when ACE feature is OFF.

I could not see any dependencies in datasheet regarding ACE, Please provide the solution for this issue.

Note: ACE means Adaptive Contrast Enhancement.

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  • Hi,

    Thanks for your response.

    I am using ADV7182 in my system. I cannot say it is black line, because the dark line at the bottom is visible clearly in the free-run mode that too in blue color background.

    This is visible only in NTSC format when ACE feature is ON.

    I do not the see the same kind of dark line in PAL type.

    I dont think its problem with ITU-R.BT 656 timing issue.

    I disabled the ACE feature,and the dark line was not visible anymore in NTSC format.

    Note: The dark horizontal line is visible from the left screen to the half of the screen only.

    The position of the dark line occurance is not at the bottom every time. Sometimes it is visible at center position too but most of the time it is visible from the bottom above ~1cm.

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  • Hi,

    Thanks for your response.

    I am using ADV7182 in my system. I cannot say it is black line, because the dark line at the bottom is visible clearly in the free-run mode that too in blue color background.

    This is visible only in NTSC format when ACE feature is ON.

    I do not the see the same kind of dark line in PAL type.

    I dont think its problem with ITU-R.BT 656 timing issue.

    I disabled the ACE feature,and the dark line was not visible anymore in NTSC format.

    Note: The dark horizontal line is visible from the left screen to the half of the screen only.

    The position of the dark line occurance is not at the bottom every time. Sometimes it is visible at center position too but most of the time it is visible from the bottom above ~1cm.

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