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How to calculate to convert Full/Limited range(ADV7611)

Question asked by Kikka on Jul 2, 2013
Latest reply on Jul 15, 2013 by Kikka

Hello.

 

I have a question about calculating formula to convert full/limited range.

 

According to "Figure 38. CP Data Path Channel A (Y) for HDMI Mode" of UG-180 Rev.B Page.112,

it seems that the formula is "Input" x "Gain" + "Offset".

 

But according to actual measurement, in the case of "Case.2" it seems that the formula is ("Input" + "Offset") x "Gain".

e.g.

16 x 1.16 + (-16) = 2.56

(16 + (-16)) x 2.56 = 0 <-- this is correct, I think.

 

Is my thought right?

 

Case.1

Input          Full range

Output       Limited range

Gain         0.86

offset        16

 

Case.2

Input         Limited range

Output      Full range

Gain        1.16

offset       -16

 

Best regards.

Kikka

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