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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
R59770057 CLM HD8 15/03/2010
Summary of Contents for CLM HD8
Page 1: ...CLM HD8 User guide R9050130 R90501301 R90501305 R59770057 08 15 03 2010 ...
Page 14: ...1 Safety 10 R59770057 CLM HD8 15 03 2010 ...
Page 22: ...2 General 18 R59770057 CLM HD8 15 03 2010 ...
Page 34: ...3 Physical installation 30 R59770057 CLM HD8 15 03 2010 ...
Page 62: ...7 Start up of the adjustment mode 58 R59770057 CLM HD8 15 03 2010 ...
Page 72: ...8 Input menu 68 R59770057 CLM HD8 15 03 2010 ...
Page 114: ...10 Layout menu 110 R59770057 CLM HD8 15 03 2010 ...
Page 156: ...13 Projector control 152 R59770057 CLM HD8 15 03 2010 ...
Page 170: ...14 Service menu 166 R59770057 CLM HD8 15 03 2010 ...
Page 184: ...16 Servicing 180 R59770057 CLM HD8 15 03 2010 ...
Page 194: ...17 Projector covers removal and installation 190 R59770057 CLM HD8 15 03 2010 ...
Page 202: ...C DMX Chart 198 R59770057 CLM HD8 15 03 2010 ...
Page 208: ...D Specifications 204 R59770057 CLM HD8 15 03 2010 ...
Page 214: ...E Troubleshooting 210 R59770057 CLM HD8 15 03 2010 ...
Page 220: ...F Mounting optional Carry handle 216 R59770057 CLM HD8 15 03 2010 ...
Page 222: ...G Order info 218 R59770057 CLM HD8 15 03 2010 ...