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APPENDIX 2
* Aspect Ratio : It is the ratio of the width of the screen to the height. The two relevant digital TV formats
are 16:9 (wide screen) or 4:3 (the traditional screen ratio). 16:9 is ergonomically more
suitable for human's eye.
* Coaxial Cable : A type of cable used to transmit high frequency signals e.g. from the antenna to the
high definition receiver.
* Composite Video : There are three elements of the video system : First - the " active video" which
* DVB : Abbreviation for "Digital Video Broadcasting". An international organization created in October
1993, whose primary objective is to achieve a common framework for all technical platforms of
digital broadcasting systems including DVB-C (cable), DVB-S (satellite), DVB-T (terrestrial),
DVB-MC (MMDS), DVB- CS (SMATV).
* EPG : Abbreviation for "Electronic Program Guide". A software that enable viewers to navigate through
the large number of channels offered by digital TV broadcaster and select the desired services.
* Frequency : The property of a signal which is measured in cycles per second(=Hertz).
* Letterbox : The picture with aspect ratio 16:9 in a 4:3 TV screen with blank lines on top and bottom. It
is the means to watch a wide screen TV program on a 4:3 TV screen.
* Megahertz (MHz) : Millions of cycles per second, which describes frequencies of radio wave or electric
* OSD : Abbreviation of "On Screen Display", used in digital set top box. OSD is comprised of a main
menu and many submenu with lots of options of functions inside.
* PAL : Stands for "Phase Alternating Line",the European video standard which has the image format of 4
by 3, 625 horizontal lines, 50 Hz and a total 8 MHz of video channel width.
* Y/Pb/Pr : Component Video Output. It is better than S-Video and Composite Video output in terms of
picture quality. Y/Pb/Pr is the standard HDTV connector.
* RGB : Output carrying the primary colors Red, Green and Blue plus the horizontal and vertical
synchronization signals. This connector is well known for PC monitors, but now also becoming
available for TV monitors.
* DVI : A DVI output carries the video signal in digital format and allows you to supply the signal to TV
monitor without any loss in quality because of digital to analogue conversion of the video signal.
26
GLOSSARY
means the picture to be displayed on the screen and its associated colors.
Second - the " sync" decides where to place each pixel on the screen. Third - the "
blanking" tells the display when to turn off the electron beam so no retrace across
the screen. These three elements combined together is called " composite video"
when connecting to a display through connectors.
current.
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