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9. Image
9.3.7.1
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 9-27 , 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 9-28
B
Black level
0.7V
Image 9-27
Black level
Δ
G
ΔΒ
Δ
R
R
G
B
Image 9-28
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 9-29
One can conclude here that a good data conversion can only be met by using three previously (input) balanced
color signals
The objective of input balancing
The objective in input balancing is to “set” the same black level and the same white level for the three colors of a particular input
source.
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R5905032 HDX SERIES 01/06/2011
Summary of Contents for HDX series
Page 1: ...HDX series Installation manual R5905032 00 01 06 2011 ...
Page 4: ......
Page 28: ...2 General 24 R5905032 HDX SERIES 01 06 2011 ...
Page 76: ...5 Getting started 5 8 Projector Address 72 R5905032 HDX SERIES 01 06 2011 ...
Page 80: ...5 Getting started 76 R5905032 HDX SERIES 01 06 2011 ...
Page 88: ...6 Quick set up adjustment 84 R5905032 HDX SERIES 01 06 2011 ...
Page 116: ...8 Input 112 R5905032 HDX SERIES 01 06 2011 ...
Page 129: ...9 Image 9 3 7 Input Balance R5905032 HDX SERIES 01 06 2011 125 ...
Page 137: ...9 Image 9 5 Timings R5905032 HDX SERIES 01 06 2011 133 ...
Page 141: ...9 Image 9 6 Image File Services R5905032 HDX SERIES 01 06 2011 137 ...
Page 154: ...9 Image 150 R5905032 HDX SERIES 01 06 2011 ...
Page 178: ...10 Layout 174 R5905032 HDX SERIES 01 06 2011 ...
Page 215: ...12 Alignment 12 14 Scenergix R5905032 HDX SERIES 01 06 2011 211 ...
Page 228: ...12 Alignment 224 R5905032 HDX SERIES 01 06 2011 ...
Page 271: ...14 Service Image 14 7 Diagnosis versions list R5905032 HDX SERIES 01 06 2011 267 ...
Page 275: ...14 Service Image 14 20 Lamp power supply logging R5905032 HDX SERIES 01 06 2011 271 ...
Page 278: ...14 Service Image 14 28 Notification overview list 274 R5905032 HDX SERIES 01 06 2011 ...
Page 298: ...15 Maintenance 294 R5905032 HDX SERIES 01 06 2011 ...
Page 302: ...16 Servicing Image 16 4 Lamp house removal 298 R5905032 HDX SERIES 01 06 2011 ...
Page 307: ...16 Servicing Image 16 9 Mount dust ring 4 Mount lens again R5905032 HDX SERIES 01 06 2011 303 ...
Page 312: ...16 Servicing 308 R5905032 HDX SERIES 01 06 2011 ...
Page 315: ...B Specifications B SPECIFICATIONS R5905032 HDX SERIES 01 06 2011 311 ...
Page 316: ...B Specifications 312 R5905032 HDX SERIES 01 06 2011 ...
Page 321: ...C Standard source files C STANDARD SOURCE FILES R5905032 HDX SERIES 01 06 2011 317 ...
Page 322: ...C Standard source files 318 R5905032 HDX SERIES 01 06 2011 ...
Page 326: ...C Standard source files 322 R5905032 HDX SERIES 01 06 2011 ...
Page 338: ...E Stacking HDX projectors 334 R5905032 HDX SERIES 01 06 2011 ...
Page 339: ...F Environmental information F ENVIRONMENTAL INFORMATION R5905032 HDX SERIES 01 06 2011 335 ...
Page 340: ...F Environmental information 336 R5905032 HDX SERIES 01 06 2011 ...
Page 344: ...F Environmental information 340 R5905032 HDX SERIES 01 06 2011 ...