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S054_075_(GB)_Video 22.07.2005 13:31 Uhr Seite 56<br />
Analogue Video Signals<br />
i<br />
AV <strong>Cables</strong><br />
FBAS or composite signal<br />
Abbreviation for: colour,<br />
picture, blanking and sync<br />
signal, also called composite<br />
or video signal.<br />
This standard signal comprises<br />
all brightness and colour<br />
signals which are required for<br />
the image formation.<br />
Y/C or S-video signal<br />
Abbreviation for:<br />
Y (luminance/brightness)<br />
C (chrominance/colour) signal.<br />
The brightness and the colour<br />
signal is transmitted on two<br />
separately conducted lines.<br />
YUV or component signal<br />
Abbreviation for:<br />
Y = luminance/brightness<br />
U = Cb or Pb (colour<br />
difference signal B-Y)<br />
V = Cr or Pr (colour difference<br />
signal R-Y)<br />
On the basis of these three<br />
signals, a red, green, blue and<br />
sync signal can be calculated<br />
in the receiver device.<br />
RGB signal<br />
The three actual colour signals<br />
(red, green, blue) are transmitted<br />
completely separated<br />
from each other and do not<br />
influence each other.<br />
However, a blanking signal<br />
has to be made available<br />
(4th/5th signal line) for the<br />
synchronization of the<br />
pictures.<br />
1 st signal<br />
line<br />
2 nd signal<br />
line<br />
3 rd signal<br />
line<br />
4 th /5 th<br />
signal line<br />
Advantage<br />
One single cable is enough for<br />
the transmission of all signals.<br />
The maximum video and colour<br />
bandwidth can be used. Only<br />
two lines are required. The sync<br />
signals continue to be in the Y-<br />
fraction.<br />
Three lines are necessary for<br />
the signal transmission. As<br />
DVDs have the YUV signal on<br />
the DVD, this transmission<br />
spread very quickly as no<br />
conversion is required. HDTV<br />
uses this signal as well.<br />
As the frequency range is not<br />
lopped off and as the signals<br />
do not influence each other,<br />
the RGB signal is the best<br />
connection for video connections.<br />
Connections<br />
RCA socket (normally yellow<br />
marking), BNC sockets<br />
at professional devices,<br />
Scart connection.<br />
Y/C Hosiden (4-pin mini socket/<br />
plug)<br />
Scart connection (special wiring<br />
in the device necessary)<br />
Three RCA sockets (colour<br />
marking)<br />
Three BNC sockets at<br />
professional devices, Scart<br />
connection (special wiring in<br />
the device necessary)<br />
RCA sockets (colour marking<br />
BNC sockets at professional<br />
devices, Scart connection<br />
(special wiring in the device<br />
necessary)<br />
Quality<br />
Standard (everywhere the case)<br />
Qualitative signal connection<br />
High-quality signal connection<br />
Best possible connection<br />
56 <strong>Hama</strong> September 2005<br />
BC = Blistercard
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