8. Image Menu
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8.10 Input Balance
Overview
• Introduction to Input Balance
• Adjusting the input balance
• Input balance for YPrPb signals
8.10.1 Introduction to Input Balance
Introduction: Unbalanced color signals
Whentransporting signals, there is always a risk of deterioration of the information contained in the signals.
Incase of information contained in the amplitude of the signals which is the case of data color signals (R, G, B),image 8-38 , we are
quitesure that the am plitude of these color signals is subject to alterations.
Anexample of alteration may be a DC component added tothe signal, in the form of a DC offset repositioning the black level, since
thisbla ck level (“brightness”) will become crucial later on (clamping circuit) it will result in “black not being black”.
Anothervalue that is subject to alteration is the amplitude of the signal, resulting in an altered “Gain” of the signal (“white level” or
contrast).
Thealterations of the three color signals will happen independently i.e. the colors will end to be unbalanced, image 8-39
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