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9. Image menu
9.3.9
Input balance
Overview
•
•
9.3.9.1
Introduction to Input Balance
Introduction: Unbalanced color signals
When transporting signals, there is always a risk of deterioration of the information contained in the signals.
In case of information contained in the amplitude of the signals which is the case of data color signals (R, G, B),image 9-41 , 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 repositioning the black level, since
this
black level
(
“brightness”
) will become crucial later on (clamping 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 altered “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 unbalanced, image 9-42
B
Black level
0.7V
Image 9-41
Black level
Δ
G
ΔΒ
Δ
R
R
G
B
Image 9-42
One can conclude here that a good color tracking can only be met by using three previously (input) balanced
color signals
Analog Digital Conversion
The analog color signals must pass through an Analog/Digital conversion circuit prior to any digital processing in the PMP.
A typical ADC transforms the analog value into an 8 bit coded digital signal.
The graphic shows that when converting a signal containing a DC offset component the range of the converter is not optimally used.
Black level
Δ
R
ADC
0
255
i1 : superfluous information
i2 : video information
Image 9-43
78
R59770179 FLM R22+ 15/03/2010
Summary of Contents for FLM R22+
Page 1: ...FLM R22 User guide R9004500 R59770179 04 15 03 2010...
Page 14: ...1 Safety 10 R59770179 FLM R22 15 03 2010...
Page 46: ...5 Connections 42 R59770179 FLM R22 15 03 2010...
Page 62: ...7 Start up of the Adjustment Mode 58 R59770179 FLM R22 15 03 2010...
Page 72: ...8 Input menu 68 R59770179 FLM R22 15 03 2010...
Page 98: ...9 Image menu 94 R59770179 FLM R22 15 03 2010...
Page 114: ...10 Layout menu Image 10 65 Image 10 66 Image 10 67 110 R59770179 FLM R22 15 03 2010...
Page 120: ...11 Lamp menu 116 R59770179 FLM R22 15 03 2010...
Page 148: ...12 Alignment menu 144 R59770179 FLM R22 15 03 2010...
Page 168: ...13 Projector control 164 R59770179 FLM R22 15 03 2010...
Page 184: ...14 Service menu 180 R59770179 FLM R22 15 03 2010...
Page 204: ...17 Removal of the projector covers 200 R59770179 FLM R22 15 03 2010...
Page 208: ...18 Dimensions 204 R59770179 FLM R22 15 03 2010...
Page 216: ...20 DMX chart 212 R59770179 FLM R22 15 03 2010...
Page 224: ...21 Troubleshooting 220 R59770179 FLM R22 15 03 2010...
Page 232: ...22 Specifications 228 R59770179 FLM R22 15 03 2010...
Page 234: ...23 Order information 230 R59770179 FLM R22 15 03 2010...