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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
R5976921 FLM R20+ PERFORMER 15/03/2010
Содержание FLM R20+ Performer
Страница 1: ...FLM R20 Performer Users manual R9004430 R5976921 11 15 03 2010 ...
Страница 34: ...3 Physical installation 30 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 46: ...5 Connections 42 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 62: ...7 Start up of the Adjustment Mode 58 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 72: ...8 Input menu 68 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 98: ...9 Image menu 94 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 114: ...10 Layout menu Image 10 65 Image 10 66 Image 10 67 110 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 120: ...11 Lamp menu 116 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 148: ...12 Alignment menu 144 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 168: ...13 Projector control 164 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 184: ...14 Service menu 180 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 204: ...17 Removal of the projector covers 200 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 208: ...A Dimensions 204 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 216: ...C DMX chart 212 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 224: ...D Troubleshooting 220 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 232: ...F Order info 228 R5976921 FLM R20 PERFORMER 15 03 2010 ...
Страница 240: ...Index 236 R5976921 FLM R20 PERFORMER 15 03 2010 ...