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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 9-28 , 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 9-29
B
Black level
0.7V
Image 9-28
Black level
Δ
G
ΔΒ
Δ
R
R
G
B
Image 9-29
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 9-30
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.
R5905158 HDF W SERIES 01/06/2012
131
Содержание HDF W22
Страница 1: ...HDF W series Installation manual R5905158 00 01 06 2012...
Страница 4: ......
Страница 26: ...2 Configurations requirements and restrictions 22 R5905158 HDF W SERIES 01 06 2012...
Страница 58: ...4 Input Communication 54 R5905158 HDF W SERIES 01 06 2012...
Страница 70: ...5 Getting started 5 8 Projector Address 66 R5905158 HDF W SERIES 01 06 2012...
Страница 76: ...5 Getting started 72 R5905158 HDF W SERIES 01 06 2012...
Страница 84: ...6 Quick set up adjustment 80 R5905158 HDF W SERIES 01 06 2012...
Страница 94: ...7 Start up of the adjustment mode 90 R5905158 HDF W SERIES 01 06 2012...
Страница 107: ...8 Input Image 8 15 Main window Image 8 16 Input native resolution R5905158 HDF W SERIES 01 06 2012 103...
Страница 120: ...8 Input 116 R5905158 HDF W SERIES 01 06 2012...
Страница 123: ...9 Image Splash image On or Off Timeout sec R5905158 HDF W SERIES 01 06 2012 119...
Страница 134: ...9 Image 9 3 7 Input Balance 130 R5905158 HDF W SERIES 01 06 2012...
Страница 142: ...9 Image 9 5 Timings 138 R5905158 HDF W SERIES 01 06 2012...
Страница 146: ...9 Image 9 6 Image File Services 142 R5905158 HDF W SERIES 01 06 2012...
Страница 198: ...11 Lamp 194 R5905158 HDF W SERIES 01 06 2012...
Страница 225: ...12 Alignment 12 14 Scenergix R5905158 HDF W SERIES 01 06 2012 221...
Страница 238: ...12 Alignment 234 R5905158 HDF W SERIES 01 06 2012...
Страница 275: ...13 Projector Control Image 13 84 DMX overview list R5905158 HDF W SERIES 01 06 2012 271...
Страница 276: ...13 Projector Control 13 8 Buttons Overview Standby button Shortcut keys 272 R5905158 HDF W SERIES 01 06 2012...
Страница 290: ...13 Projector Control 286 R5905158 HDF W SERIES 01 06 2012...
Страница 294: ...14 Service Image 14 3 Identification 2 Use the or key to scroll through the menu 290 R5905158 HDF W SERIES 01 06 2012...
Страница 297: ...14 Service Image 14 7 Diagnosis versions list R5905158 HDF W SERIES 01 06 2012 293...
Страница 301: ...14 Service Image 14 20 Lamp power supply logging R5905158 HDF W SERIES 01 06 2012 297...
Страница 304: ...14 Service Image 14 28 Notification overview list 300 R5905158 HDF W SERIES 01 06 2012...
Страница 322: ...14 Service 318 R5905158 HDF W SERIES 01 06 2012...
Страница 326: ...15 Maintenance 322 R5905158 HDF W SERIES 01 06 2012...
Страница 336: ...16 Removal and installation of the projector covers 332 R5905158 HDF W SERIES 01 06 2012...
Страница 349: ...A Specifications A SPECIFICATIONS R5905158 HDF W SERIES 01 06 2012 345...
Страница 350: ...A Specifications 346 R5905158 HDF W SERIES 01 06 2012...
Страница 359: ...C Standard source files C STANDARD SOURCE FILES R5905158 HDF W SERIES 01 06 2012 355...
Страница 360: ...C Standard source files 356 R5905158 HDF W SERIES 01 06 2012...
Страница 364: ...C Standard source files 360 R5905158 HDF W SERIES 01 06 2012...
Страница 365: ...D DMX chart D DMX CHART Overview DMX chart Basic DMX chart Full DMX chart Extended R5905158 HDF W SERIES 01 06 2012 361...
Страница 375: ...F Environmental information F ENVIRONMENTAL INFORMATION R5905158 HDF W SERIES 01 06 2012 371...
Страница 376: ...F Environmental information 372 R5905158 HDF W SERIES 01 06 2012...
Страница 380: ...F Environmental information 376 R5905158 HDF W SERIES 01 06 2012...