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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
80
R59770021 CLM R10+ 15/03/2010
Содержание CLM R10+ R9050100
Страница 1: ...CLM R10 Users manual R9050100 R90501001 R59770021 10 15 03 2010 ...
Страница 14: ...1 Safety 10 R59770021 CLM R10 15 03 2010 ...
Страница 22: ...2 General 18 R59770021 CLM R10 15 03 2010 ...
Страница 35: ...3 Physical installation Skew Image 3 28 Skew adjustment R59770021 CLM R10 15 03 2010 31 ...
Страница 36: ...3 Physical installation 32 R59770021 CLM R10 15 03 2010 ...
Страница 48: ...5 Connections 44 R59770021 CLM R10 15 03 2010 ...
Страница 64: ...7 Start up of the Adjustment mode 60 R59770021 CLM R10 15 03 2010 ...
Страница 74: ...8 Input menu 70 R59770021 CLM R10 15 03 2010 ...
Страница 115: ...10 Layout menu Image 10 61 Image 10 62 Image 10 63 Image 10 64 R59770021 CLM R10 15 03 2010 111 ...
Страница 116: ...10 Layout menu 112 R59770021 CLM R10 15 03 2010 ...
Страница 158: ...13 Projector control 154 R59770021 CLM R10 15 03 2010 ...
Страница 172: ...14 Service menu 168 R59770021 CLM R10 15 03 2010 ...
Страница 186: ...16 Servicing 182 R59770021 CLM R10 15 03 2010 ...
Страница 195: ...17 Projector covers removal and installation Image 17 18 Secure the lamp door R59770021 CLM R10 15 03 2010 191 ...
Страница 196: ...17 Projector covers removal and installation 192 R59770021 CLM R10 15 03 2010 ...
Страница 204: ...C DMX Chart 200 R59770021 CLM R10 15 03 2010 ...
Страница 210: ...D Specifications 206 R59770021 CLM R10 15 03 2010 ...
Страница 216: ...E Troubleshooting 212 R59770021 CLM R10 15 03 2010 ...
Страница 222: ...F Mounting optional Carry handle 218 R59770021 CLM R10 15 03 2010 ...
Страница 224: ...G Order info 220 R59770021 CLM R10 15 03 2010 ...
Страница 232: ...Index 228 R59770021 CLM R10 15 03 2010 ...