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Glossary
* Aspect Ratio : It is the ratio of the width of the screen to the height. The two
relevant digital TV formats are 16:9 (widescreen) or 4:3 (the traditional screen
ratio). 16:9 is more ergonomically suitable for the human eye.
* Bandwidth : Frequency range allows for carrying a certain radio signal. The
speed of data transmission depends on the available bandwidth of the
transmission channel.
* Coaxial Cable : A type of cable used to transmit high frequency signals e.g. from
the VHF/UHF antenna to the terrestrial Digital TV receiver.
* Composite Video : There are three elements of the video system : First - the
"active video" which means the picture to be displayed on the screen and
its associated colours. 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.
* 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". 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).
* HDCP : HDCP is a specification developed by Intel Corporation to protect digital
entertainment content access the HDMI interface.
* HDMI : Abbreviation for High-Definition Multimedia Interface to provide crystal-
clear digital quality over a signal cable.
* 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.