AnsweredAssumed Answered

ADV7182 Colour separation on CVBS input

Question asked by LarsP on Feb 7, 2014
Latest reply on Feb 14, 2014 by LarsP

Hi

 

We have the same card ed0 and ed1.  Ed0 has ADV7180, Ed1 has ADV7182.
We see that ADV7182 has poor quality on colour test-images.  We see a lot of
noise on the output image. We are using video test instrument from Tektronix to
generate test-images.
This noise is located to the Y-component when all shaping filters are set to
"default".  Setting a Notch filter or a low pass filter < SVHS11, this noise is
effectively killed.
Using Y-shaping filters that removes the colour carrier frequency is effective,
but also removes image sharpness/details in the higher frequency band (above
4,4MHz).
Adjusting Comb-filter settings seem not to help.
The ADV7180 has not this problem.

Need help on this topic....!

 

 

LarsP

 

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