Barco R5976924 8.5.9 Input balance 8.5.9.1 Introduction to Input Balance Introduction: Unbalanced color signals

8. Configurator, Projector adjustment settings
Image 8-21
Custom aspect ratio
8.5.9 Input balance
8.5.9.1 Introduction to Input Balance
Introduction: Unbalanced color signals
Whentranspor ting signals, there is always a risk of deterioration of the information conta ined in the signals.
In case of information contained in the amplitude of the signals which i s the case of data color signals (R,
G, B),image 8-22 , we are quite sure that the amplitude of these color signals is subject to alterations.
An example of alteration may be a DC component added to the signal, in the form of a DC offset reposi-
tioningthe black level, since this black level (“brightness”) will become crucial later on (clampi ng circuit)
it will result in “black not being black”.
Another value that is subject to alteration is the amplitude of the signal, resulting in an a ltered “Gain” of
the signal (“white level” or contrast).
The alterations of the three color signals will happen independently i.e. the colors will end to be unbal-
anced, image 8-23
B
Black level
0.7V
Image 8-22
Black level
Δ
G
ΔΒ
Δ
R
R
GB
Image 8-23
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