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