8. Image Menu
8.10 Input Balance
Overview
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•
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Input balance for YPrPb signals
8.10.1 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 8-33 , 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 8-34
B
Black level
0.7V
Image 8-33
Black level
∆
G
∆Β
∆
R
R
G
B
Image 8-34
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
∆
R
ADC
0
255
i1 : superfleous information
i2 : video information
Image 8-35
R5976816 RLM R6+ PERFORMER 21/12/2005
81
Summary of Contents for RLM R6+ Performer
Page 1: ...RLM R6 Performer Owners manual R9010270 R5976816 02 21 12 2005...
Page 4: ......
Page 8: ...Table of contents 4 R5976816 RLM R6 PERFORMER 21 12 2005...
Page 14: ...1 Packaging and Dimensions 10 R5976816 RLM R6 PERFORMER 21 12 2005...
Page 54: ...5 Getting used with the menu structure 50 R5976816 RLM R6 PERFORMER 21 12 2005...
Page 60: ...6 Source selection 56 R5976816 RLM R6 PERFORMER 21 12 2005...
Page 64: ...7 General Menu Image 7 7 60 R5976816 RLM R6 PERFORMER 21 12 2005...
Page 91: ...8 Image Menu Image 8 46 Image 8 47 R5976816 RLM R6 PERFORMER 21 12 2005 87...
Page 92: ...8 Image Menu 88 R5976816 RLM R6 PERFORMER 21 12 2005...
Page 102: ...9 Tools Menu 98 R5976816 RLM R6 PERFORMER 21 12 2005...
Page 122: ...12 Image Files Menu 118 R5976816 RLM R6 PERFORMER 21 12 2005...
Page 144: ...14 Installation menu 140 R5976816 RLM R6 PERFORMER 21 12 2005...
Page 156: ...A Standard Image Files 152 R5976816 RLM R6 PERFORMER 21 12 2005...
Page 160: ...C Specifications 156 R5976816 RLM R6 PERFORMER 21 12 2005...